Biggest changeSelling and Marketing Expense The following table presents our selling and marketing expense for the fiscal years presented (dollars in thousands): Percentage Change 2023 2022 2021 2023 vs. 2022 2022 vs. 2021 Selling and marketing expenses $ 107,834 $ 88,856 $ 67,294 21.4 % 32.0 % Percentage of sales 33.4 % 31.2 % 29.2 % Selling and marketing expenses for 2023 increased 21.4% from 2022, due to increased advertising and promotional activities, salary-related payroll tax expenses, sales commission expenses and travel expenses, partially offset by bonus and stock-based compensation expenses.
Biggest changeGeneral and administrative expenses for 2023 increased 32.1% from 2022, due to increased salary-related and payroll tax expenses, outside services, facilities costs, bonus and stock-based compensation expenses and Japan one-time employee benefits. 37 Selling and Marketing Expense The following table presents our selling and marketing expense for the fiscal years presented (dollars in thousands): Percentage Change 2024 2023 2022 2024 vs. 2023 2023 vs. 2022 Selling and marketing expense $ 108,322 $ 107,834 $ 88,856 0.5 % 21.4 % Percentage of sales 34.5 % 33.4 % 31.2 % Selling and marketing expenses for 2024 increased 0.5% from 2023, due to increased salary-related payroll tax expenses, trade shows and sales meeting expenses, costs and charges associated with the opening of our new EVO Experience Center, sales commission expenses and travel expenses, offset by decreased advertising and promotional activities.
Other income (expense), net generally relates to interest income earned on cash, cash equivalents and investments available for sale, interest expense on finance lease obligations, gains or losses on foreign currency transactions, and royalty income.
Other income, net generally relates to interest income earned on cash, cash equivalents and investments available for sale, interest expense on finance lease obligations, gains or losses on foreign currency transactions, and royalty income.
In projecting future taxable income, we begin with historical results and incorporate assumptions including overall current and projected business and industry conditions, projected sales growth, margins, costs and income by jurisdiction, the amount of future federal, state, and foreign pretax operating income, the reversal of temporary differences and the successful implementation of feasible and prudent tax-planning strategies.
In projecting future taxable income, we begin with historical results and incorporate assumptions including overall current and projected business and industry 41 conditions, projected sales growth, margins, costs and income by jurisdiction, the amount of future federal, state, and foreign pretax operating income, the reversal of temporary differences and the successful implementation of feasible and prudent tax-planning strategies.
For 2023, net cash provided by financing activities of $7.4 million consisted primarily from the exercise of stock options of $9.7 million, partially offset by $2.1 million to repurchase employee common stock for taxes withheld. For 2022, net cash provided by financing activities of $8.3 million consisted primarily of proceeds from the exercise of stock options.
For 2023, cash provided by financing activities of $7.4 million consisted primarily from the exercise of stock options of $9.7 million, partially offset by $2.1 million to repurchase employee common stock for taxes withheld. For 2022, cash provided by financing activities of $8.3 million consisted primarily of proceeds from the exercise of stock options.
For 2022, net cash used in investment activities resulted from $155.7 million in purchases of investments available for sale and $18.1 million in purchases of property, plant and equipment, partially offset by $17.5 million of proceeds from the maturity of investments available for sale.
For 2022, cash used in investment activities resulted from $155.7 million in purchases of investments available for sale and $18.1 million in purchases of property, plant and equipment, partially offset by $17.5 million of proceeds from the maturity of investments available for sale.
Results of Operations The following table sets forth the percentage of total sales represented by certain items reflected in the Company’s Consolidated Statement of Income for the period indicated.
Results of Operations The following table sets forth the percentage of total sales represented by certain items reflected in the Company’s Consolidated Statement of Operations for the period indicated.
“Business,” for a discussion of: • Operations • Principal Products • Distribution and Customers • Competition • Regulatory Matters • Research and Development Strategic Imperatives for 2024 We believe we have a significant opportunity to fundamentally transform how myopia and other refractive conditions are treated.
“Business,” for a discussion of: • Operations • Principal Products • Distribution and Customers • Competition • Regulatory Matters • Research and Development Strategic Imperatives for 2025 We believe we have a significant opportunity to fundamentally transform how myopia and other refractive conditions are treated.
Gross profit margin decreased to 78.4% of revenue for 2023 compared to 78.5% of revenue for 2022, due to reserves related to cataract IOLs and increased period costs associated with manufacturing expansion projects, offset by an increased mix of ICL sales, which carry a higher margin. Gross profit for 2022 increased 25.0% from 2021.
Gross profit margin increased to 78.4% of revenue for 2023 compared to 78.5% of revenue for 2022, due to reserves related to cataract IOLs and increased period costs associated with manufacturing expansion projects, offset by an increased mix of ICL sales, which carry a higher margin.
In 2024, we will also continue to drive awareness of the ICL procedure to reach even more potential patients and effectively communicate the clinical benefits of our ICLs. While we work to launch our existing product portfolio in attractive global markets, we are also investing in product innovation.
In 2025, we will also continue to drive awareness of the ICL procedure to reach even more potential patients and effectively communicate the clinical benefits of our ICLs. While we work to launch our existing product portfolio in attractive global markets, we also intend to continue to invest in product innovation in 2025.
We make our ICL product offerings available in multiple models, powers and lengths, including some with toric ICL (TICL) versions to correct for astigmatism (blurred vision). Not all of our products are currently available in all markets where we sell ICLs today.
We make our ICL product offerings available in multiple models, powers and lengths, including some with toric ICL (TICL) versions to correct for astigmatism (blurred vision). Not all of our products are currently available in all markets where we sell ICLs today. STAAR employs a commercialization strategy that strives for sustainable, profitable growth.
General and Administrative Expense The following table presents our general and administrative expense for the fiscal years presented (dollars in thousands): Percentage Change 2023 2022 2021 2023 vs. 2022 2022 vs. 2021 General and administrative expense $ 72,319 $ 54,742 $ 44,142 32.1 % 24.0 % Percentage of sales 22.4 % 19.2 % 19.2 % General and administrative expenses for 2023 increased 32.1% from 2022, due to increased salary-related and payroll tax expenses, outside services, facilities costs, bonus and stock-based compensation expenses and Japan one-time employee benefits.
General and Administrative Expense The following table presents our general and administrative expense for the fiscal years presented (dollars in thousands): Percentage Change 2024 2023 2022 2024 vs. 2023 2023 vs. 2022 General and administrative expense $ 89,898 $ 72,319 $ 54,742 24.3 % 32.1 % Percentage of sales 28.6 % 22.4 % 19.2 % General and administrative expenses for 2024 increased 24.3% from 2023, due to increased outside services, facilities costs, salary-related and payroll tax expenses and bonus and stock-based compensation expenses.
Other Income (Expense), Net The following table presents our other income (expense), net for the fiscal years presented (dollars in thousands): Percentage Change 2023 2022 2021 2023 vs. 2022 2022 vs. 2021 Other income (expense), net $ 5,599 $ 1,750 $ (2,035 ) — * — * Percentage of sales 1.7 % 0.6 % (0.9 )% * Denotes change is greater than + 100%.
Other Income, Net The following table presents our other income, net for the fiscal years presented (dollars in thousands): Percentage Change 2024 2023 2022 2024 vs. 2023 2023 vs. 2022 Other income, net $ 3,559 $ 5,599 $ 1,750 (36.4 )% — * Percentage of sales 1.0 % 1.7 % 0.6 % * Denotes change is greater than + 100%.
Percentage of Net Sales 2023 2022 2021 Net sales 100.0 % 100.0 % 100.0 % Cost of sales 21.6 % 21.5 % 22.5 % Gross profit 78.4 % 78.5 % 77.5 % General and administrative 22.4 % 19.2 % 19.2 % Selling and marketing 33.4 % 31.2 % 29.2 % Research and development 13.8 % 12.7 % 14.7 % Total selling, general and administrative 69.6 % 63.1 % 63.1 % Operating income 8.8 % 15.4 % 14.4 % Total other income (expense), net 1.7 % 0.6 % (0.9 )% Income before income taxes 10.5 % 16.0 % 13.5 % Provision for income taxes 3.8 % 2.1 % 1.6 % Net income 6.7 % 13.9 % 11.9 % 34 Net Sales The following table presents our net sales, by product for the fiscal years presented (dollars in thousands): 2023 2022 2021 % of Total Sales % of Total Sales % of Total Sales ICLs 99.1 % $ 319,427 94.8 % $ 269,712 92.4 % $ 212,905 Other product sales Cataract IOLs 0.3 % 1,139 3.4 % 9,638 5.4 % 12,519 Other surgical products 0.6 % 1,849 1.8 % 5,041 2.2 % 5,048 Total other product sales 0.9 % 2,988 5.2 % 14,679 7.6 % 17,567 Net sales 100.0 % $ 322,415 100.0 % $ 284,391 100.0 % $ 230,472 Net sales for 2023 increased 13% from 2022.
Percentage of Net Sales 2024 2023 2022 Net sales 100.0 % 100.0 % 100.0 % Cost of sales 23.7 % 21.6 % 21.5 % Gross profit 76.3 % 78.4 % 78.5 % General and administrative 28.6 % 22.4 % 19.2 % Selling and marketing 34.5 % 33.4 % 31.2 % Research and development 17.2 % 13.8 % 12.7 % Total selling, general and administrative 80.3 % 69.6 % 63.1 % Operating income (loss) (4.0 )% 8.8 % 15.4 % Total other income, net 1.0 % 1.7 % 0.6 % Income (loss) before income taxes (3.0 )% 10.5 % 16.0 % Provision for income taxes 3.6 % 3.8 % 2.1 % Net income (loss) (6.6 )% 6.7 % 13.9 % Net Sales The following table presents our net sales, by product for the fiscal years presented (dollars in thousands): 2024 2023 2022 % of Total Sales % of Total Sales % of Total Sales ICLs 99.6 % $ 312,543 99.1 % $ 319,427 94.8 % $ 269,712 Other product sales Cataract IOLs 0.0 % — 0.3 % 1,139 3.4 % 9,638 Other surgical products 0.4 % 1,358 0.6 % 1,849 1.8 % 5,041 Total other product sales 0.4 % 1,358 0.9 % 2,988 5.2 % 14,679 Net sales 100.0 % $ 313,901 100.0 % $ 322,415 100.0 % $ 284,391 Net sales for 2024 decreased 3% from 2023.
We do not believe the temporary increase in net accounts receivable reflected a trend, nor that it would have a material impact on cash flows as our available liquidity and capital resources had sufficient working capital despite the increase in net accounts receivable. Inventories, net was $35.1 million and $24.2 million at December 29, 2023 and December 30, 2022, respectively.
We do not believe the increases in net accounts receivable reflect a trend, nor that it would have a material impact on cash flows as our available liquidity and capital resources had sufficient working capital despite the increases in net accounts receivable. Inventories, net was $43.3 million and $35.1 million at December 27, 2024 and December 29, 2023, respectively.
Inflation Management believes inflation has not had a significant impact on our net sales and revenues and on income from continuing operations during the past three years. Recent Accounting Pronouncements See “ Part II. Item 8.
We do not currently hedge transactions to offset changes in foreign currency. Inflation Management believes inflation has not had a significant impact on our net sales and revenues and on income from continuing operations during the past three years. Recent Accounting Pronouncements See “ Part II. Item 8.
The change in other income, net for 2023 was due to increased interest income as a result of higher interest rates during 2023. The change in other income (expense), net for 2022 was due to increased interest income, as a result of our investments held available for sale and higher interest rates and decreased foreign exchange losses (primarily euro).
The change in other income, net for 2024 was due to increased foreign exchange losses (primarily Japanese Yen and euro) and lower interest income as a result of lower balances of investments available for sale. The change in other income, net for 2023 was due to increased interest income as a result of higher interest rates during 2023.
Also impacting our effective tax rates was a $3.3 million recapture of our U.S. valuation allowance in 2023 and a $0.9 million and $3.4 million release of our U.S. valuation allowance in 2022 and 2021, respectively. During 2023, 2022 and 2021, there were no unrecognized benefits related to uncertain tax positions taken by us.
Also impacting our effective tax rates was a $4.5 million recapture of our U.S. valuation allowance in 2024, $3.3 million recapture of our U.S. valuation allowance in 2023 and a $0.9 million release of our U.S. valuation allowance in 2022. Also during 2024, we recognized $1.5 million of unrecognized benefits, including interest, related to uncertain tax positions taken by us.
The fair values of plan assets are determined based on prevailing market prices. Foreign Exchange Management does not believe that the fluctuation in the value of the dollar in relation to the currencies of its suppliers or customers in the last three fiscal years has adversely affected our ability to purchase or sell products at agreed upon prices.
Foreign Exchange Rate Impact Management does not believe that the fluctuation in the value of the dollar in relation to the currencies of its suppliers or customers in the last three fiscal years has materially adversely affected our ability to purchase or sell products at agreed upon prices.
The following Management’s Discussion and Analysis of Financial Condition and Results of Operations is intended to promote understanding of our financial condition and results of operations. You should read the following discussion and analysis of our financial condition and results of operations in conjunction with the Consolidated Financial Statements and the Notes to those statements included in this Annual Report.
You should read the following discussion and analysis of our financial condition and results of operations in conjunction with the Consolidated Financial Statements and the Notes to those statements included in this Annual Report. This discussion includes forward-looking statements that involve risks and uncertainties.
Changes in foreign currency unfavorably impacted other product sales by $0.3 million. Other product sales represented 1.0% of our total sales for fiscal year 2023. Other product sales in 2022 decreased 16% from 2021, mainly due to decreased cataract IOL sales. Changes in foreign currency unfavorably impacted other product sales by $2.6 million.
Other product sales represented less than 1.0% of our total sales for fiscal year 2024. Other product sales in 2023 decreased 80% from 2022, mainly due to decreased sales of cataract IOLs and cataract IOL injector parts and increased sales returns reserves related to cataract IOLs. Changes in foreign currency unfavorably impacted other product sales by $0.3 million.
The increase in net sales was due to increased ICL sales of $49.7 million, partially offset by a decrease in other product sales of $11.7 million. Changes in foreign currency unfavorably impacted net sales by $2.1 million. Net sales for 2022 increased 23% from 2021.
The decrease in net sales was due to decreased ICL sales of $6.9 million and decreased other product sales of $1.6 million. Net sales for 2023 increased 13% from 2022. The increase in net sales was due to increased ICL sales of $49.7 million, partially offset by a decrease in other product sales of $11.7 million.
Our financial condition at December 29, 2023, December 30, 2022 and December 31, 2021 included the following (in thousands): 2023 2022 2021 2023 vs. 2022 2022 vs. 2021 Cash and cash equivalents $ 183,038 $ 86,480 $ 199,706 $ 96,558 $ (113,226 ) Investments available for sale 49,391 139,061 — (89,670 ) 139,061 Total $ 232,429 $ 225,541 $ 199,706 $ 6,888 $ 25,835 Current assets $ 365,269 $ 311,723 $ 271,411 $ 53,546 $ 40,312 Current liabilities $ 65,036 $ 51,716 $ 48,802 $ 13,320 $ 2,914 Working capital $ 300,233 $ 260,007 $ 222,609 $ 40,226 $ 37,398 Cash and cash equivalents include cash and balances in deposits and money market accounts held at banks and financial institutions.
Our financial condition at December 27, 2024, December 29, 2023 and December 30, 2022 included the following (in thousands): 2024 2023 2022 2024 vs. 2023 2023 vs. 2022 Cash and cash equivalents $ 144,159 $ 183,038 $ 86,480 $ (38,879 ) $ 96,558 Investments available for sale 86,335 49,391 139,061 36,944 (89,670 ) Total $ 230,494 $ 232,429 $ 225,541 $ (1,935 ) $ 6,888 Current assets $ 367,940 $ 365,269 $ 311,723 $ 2,671 $ 53,546 Current liabilities $ 70,306 $ 65,036 $ 51,716 $ 5,270 $ 13,320 Working capital $ 297,634 $ 300,233 $ 260,007 $ (2,599 ) $ 40,226 Cash and cash equivalents include cash and balances in deposits and money market accounts held at banks and financial institutions.
The Americas region sales increased 11%, with unit increase of 9%, due to sales growth in the U.S. up 14% and Canada up 5%, partially offset by a sales decrease in our Latin America distributor markets down 3%. Changes in foreign currency unfavorably impacted ICL sales by $1.8 million, which impacted our Japan and Europe, Middle East and Africa markets.
The Americas region sales increased 36 11%, with unit increase of 9%, due primarily to sales growth in the U.S. Changes in foreign currency unfavorably impacted ICL sales by $1.8 million, which impacted our Japan and Europe, Middle East and Africa markets. ICL sales represented 99.1% of our total sales for fiscal year 2023.
Overview STAAR Surgical Company designs, develops, manufactures, and sells implantable lenses for the eye and accessory delivery systems used to deliver the lenses into the eye. We are the leading manufacturer of lenses used worldwide in corrective or “refractive” surgery. We have been dedicated solely to ophthalmic surgery for over 40 years.
We are the leading manufacturer of phakic implantable lenses used worldwide in corrective or “refractive” surgery. We have been dedicated solely to ophthalmic surgery for over 40 years.
While such inventory losses have historically been within our expectations and the provisions established, we cannot guarantee that we will continue to experience the same loss rates that we have in the past. 40 Employee Defined Benefit Plans - Pension The liabilities and annual income or expense of our pension plans are determined using methodologies that involve several actuarial assumptions, the most significant of which are the discount rate, expected years of service, salary increases and the expected long-term rate of asset return.
Employee Defined Benefit Plans - Pension The liabilities and annual income or expense of our pension plans are determined using methodologies that involve several actuarial assumptions, the most significant of which are the discount rate, expected years of service, salary increases and the expected long-term rate of asset return.
The maturity of individual investments may not extend 24 months from the date of purchase. There are also limits to the amount of credit exposure in any given security type. Additionally, during 2021 we fully repaid and cancelled our Japan line of credit and cancelled our Swiss framework agreement given our current cash resources.
The maturity of individual investments may not extend 24 months from the date of purchase. There are also limits to the amount of credit exposure in any given security type.
Other product sales represented 5.2% of our total sales for fiscal year 2022. 35 Gross Profit The following table presents our gross profit and gross profit margin for the fiscal years presented (dollars in thousands): Percentage Change 2023 2022 2021 2023 vs. 2022 2022 vs. 2021 Gross profit $ 252,651 $ 223,383 $ 178,637 13.1 % 25.0 % Gross profit margin 78.4 % 78.5 % 77.5 % Gross profit for 2023 increased 13.1% from 2022.
Gross Profit The following table presents our gross profit and gross profit margin for the fiscal years presented (dollars in thousands): Percentage Change 2024 2023 2022 2024 vs. 2023 2023 vs. 2022 Gross profit $ 239,582 $ 252,651 $ 223,383 (5.2 )% 13.1 % Gross profit margin 76.3 % 78.4 % 78.5 % Gross profit for 2024 decreased 5.2% from 2023.
The following table presents a summary of cash flows for the fiscal years presented (dollars in thousands): 2023 2022 2021 Cash flows from: Operating activities $ 14,594 $ 35,715 $ 43,962 Investing activities 74,347 (156,376 ) (13,645 ) Financing activities 7,415 8,297 17,793 Effect of exchange rate changes 202 (862 ) (857 ) Net change in cash and cash equivalents 96,558 (113,226 ) 47,253 Cash and cash equivalents, at beginning of year 86,480 199,706 152,453 Cash and cash equivalents, at end of year $ 183,038 $ 86,480 $ 199,706 For 2023, net cash provided by operating activities consisted of $34.1 million in non-cash items and $21.3 million in net income, offset by $40.8 million in working-capital changes.
Overview of changes in cash and cash equivalents and other working capital accounts The following table presents a summary of cash flows for the fiscal years presented (dollars in thousands): 2024 2023 2022 Cash flows from: Operating activities $ 15,725 $ 14,594 $ 35,715 Investing activities (59,217 ) 74,347 (156,376 ) Financing activities 5,724 7,415 8,297 Effect of exchange rate changes (1,111 ) 202 (862 ) Net change in cash and cash equivalents (38,879 ) 96,558 (113,226 ) Cash and cash equivalents, at beginning of year 183,038 86,480 199,706 Cash and cash equivalents, at end of year $ 144,159 $ 183,038 $ 86,480 For 2024, cash provided by operating activities consisted of $41.3 million in non-cash items primarily related to stock-based compensation expenses, partially offset by a $20.2 million net loss and $5.4 million in working-capital changes primarily related to the capitalization of cloud-based software and changes in inventories, partially offset by changes in accounts receivable.
The sales increase was driven by the APAC region, which grew 21% with unit growth of 22%, primarily due to sales growth in China up 25%, India up 14%, other APAC Distributors up 13%, Japan up 11% and Korea up 11%.
The sales increase was driven by the APAC region, which grew 21% with unit growth of 22%, primarily due to sales growth in China, other APAC Distributors, India, Japan and Korea. The Europe, Middle East and Africa region sales increased 7% with units similar to prior year, due to sales growth in our distributor markets and direct markets.
The table below summarizes the year over year changes in other income (expense), net (in thousands): Favorable (Unfavorable) 2023 vs. 2022 2022 vs. 2021 Interest income (expense), net $ 4,538 $ 2,486 Foreign exchange (202 ) 1,257 Royalty income (730 ) (211 ) Other 243 253 Net change in other income (expense), net $ 3,849 $ 3,785 Provision for Income Taxes The following table presents our provision for income taxes for the fiscal years presented (in thousands): Percentage Change 2023 2022 2021 2023 vs. 2022 2022 vs. 2021 Provision for income taxes $ 12,349 $ 5,887 $ 3,793 — * 55.2 % Effective tax rate 36.6 % 12.9 % 12.1 % * Denotes change is greater than + 100%. 37 Our effective tax rates differ from the U.S. federal statutory rate of 21% for 2023, 2022 and 2021, respectively, primarily due to the income taxes generated in foreign jurisdictions and realizability of deferred tax assets.
The table below summarizes the year over year changes in other income, net (in thousands): 38 Favorable (Unfavorable) 2024 vs. 2023 2023 vs. 2022 Interest income, net $ (1,075 ) $ 4,538 Foreign exchange (1,766 ) (202 ) Royalty income 434 (730 ) Other 367 243 Net change in other income, net $ (2,040 ) $ 3,849 Provision for Income Taxes The following table presents our provision for income taxes for the fiscal years presented (in thousands): Percentage Change 2024 2023 2022 2024 vs. 2023 2023 vs. 2022 Provision for income taxes $ 11,156 $ 12,349 $ 5,887 (9.7 )% — * Effective tax rate (123.2 )% 36.6 % 12.9 % * Denotes change is greater than + 100%.
As a result of third-party materials and supply chain challenges that affected our cataract IOLs and associated delivery devices, we have phased out sales of our cataract IOLs as we focus on growing our ICL business. During 2023, we stopped manufacturing cataract IOLs, and we do not plan to sell cataract IOLs in 2024.
Other product sales include cataract IOLs, delivery systems and normal recurring sales adjustments such as sales return allowances. As a result of third-party materials and supply chain challenges that affected our cataract IOLs and associated delivery devices, we have phased out sales of our cataract IOLs as we focus on growing our ICL business.
Our growth strategy includes making our complete ICL product line available in our existing geographic markets and expanding into attractive markets where we do not sell our products today.
Our growth strategy includes making our complete ICL product line available in our existing geographic markets and expanding into attractive markets where we do not sell our products today. In addition, we are focused on driving awareness of the ICL procedure and the clinical benefits of our ICLs, and providing surgeon training, support and education, particularly in our newer markets.
The Americas region sales increased 43%, with unit increase of 35%, due to sales growth in the U.S. up 59%, Latin America distributor markets up 11% and Canada up 10%.
The Europe, Middle East and Africa region sales increased 10% with unit growth up 17%, due primarily to sales increases in our distributor markets. The Americas region sales increased 16%, with unit increase of 17%, due primarily to sales growth in the U.S.
Research and development expenses for 2022 increased 6.3% from 2021 due to increased salary-related and payroll tax expenses and bonus and stock-based compensation expenses, partially offset by decreased clinical expenses associated with our U.S. EVO clinical trials.
Research and development expenses for 2023 increased 23.4% from 2022 due to increased salary-related and payroll tax expenses and clinical expenses associated with our U.S. post-approval clinical trials.
Several factors may influence the realizability of our inventories, including significant changes in demand, decisions to exit a product line, technological change, and new product development.
Several factors may influence the realizability of our inventories, including significant changes in demand, decisions to exit a product line, technological change, and new product development. While such inventory losses have historically been within our expectations and the provisions established, we cannot guarantee that we will continue to experience the same loss rates that we have in the past.
Selling and marketing expenses for 2022 increased 32.0% from 2021, due to increased advertising and promotional activities, trade shows and sales meetings expense, travel expenses and bonus and stock-based compensation expenses. 36 Research and Development Expense The following table presents our research and development expense for the fiscal years presented (dollars in thousands): Percentage Change 2023 2022 2021 2023 vs. 2022 2022 vs. 2021 Research and development expense $ 44,401 $ 35,983 $ 33,862 23.4 % 6.3 % Percentage of sales 13.8 % 12.7 % 14.7 % Research and development expenses for 2023 increased 23.4% from 2022 due to increased salary-related and payroll tax expenses and clinical expenses associated with our U.S. post-approval clinical trials.
Research and Development Expense The following table presents our research and development expense for the fiscal years presented (dollars in thousands): Percentage Change 2024 2023 2022 2024 vs. 2023 2023 vs. 2022 Research and development expense $ 53,973 $ 44,401 $ 35,983 21.6 % 23.4 % Percentage of sales 17.2 % 13.8 % 12.7 % Research and development expenses for 2024 increased 21.6% from 2023 due to increased salary-related and payroll tax expenses, purchases of in-process research and development related to external AI tools for measurement and lens size selection and outside services related to professional and medical education, partially offset by decreased clinical expenses associated with our U.S. post-approval clinical trials.
Liquidity and Capital Resources Our principal sources of liquidity are cash, cash equivalents, investments available for sale and cash flow from operating activities.
There were no unrecognized benefits related to uncertain tax positions taken by us in 2023 or 2022. Liquidity and Capital Resources Our principal sources of liquidity are cash, cash equivalents, investments available for sale and cash flow from operating activities.
No assurance can be given, however, that adverse currency exchange rate fluctuations will not occur in the future, which could significantly affect our operating results. We do not currently hedge transactions to offset changes in foreign currency.
However, currency exchange fluctuations do impact our net sales and results of operations as discussed under Item 7A. Quantitative and Qualitative Disclosures About Market Risk. No assurance can be given that adverse currency exchange rate fluctuations will not occur in the future, which could significantly affect our operating results.
Our current liquidity and capital resources, as discussed above, will enable us to meet our known contractual obligations as of December 29, 2023 (in thousands): 38 Payments Due by Period Contractual Obligations Total 1 Year 2 – 3 Years 4 – 5 Years More than 5 Years Finance lease obligations (Note 9)* $ 213 $ 171 $ 42 $ — $ — Operating lease obligations (Note 9)* 45,868 6,247 10,829 11,087 17,705 Pension benefit payments (Note 11)* 5,055 236 383 4,214 222 Asset retirement obligation (Note 13)* 103 — 103 — — Open purchase orders (Note 13)* 18,199 16,452 1,260 487 — Total $ 69,438 $ 23,106 $ 12,617 $ 15,788 $ 17,927 * Refer to the Notes to the Consolidated Financial Statements in this Annual Report on Form 10-K Overview of changes in cash and cash equivalents and other working capital accounts.
We do not have any off-balance sheet arrangements. 39 Our current liquidity and capital resources, as discussed above, will enable us to meet our known contractual obligations as of December 27, 2024 (in thousands): Payments Due by Period Contractual Obligations Total 1 Year 2 – 3 Years 4 – 5 Years More than 5 Years Finance lease obligations (Note 8)* $ 42 $ 42 $ — $ — $ — Operating lease obligations (Note 8)* 51,301 6,449 11,533 14,076 19,243 Pension benefit payments (Note 10)* 6,737 137 353 4,171 2,076 Asset retirement obligation (Note 12)* 42 28 — 14 — Open purchase orders (Note 12)* 12,948 11,536 1,148 264 — Total $ 71,070 $ 18,192 $ 13,034 $ 18,525 $ 21,319 * Refer to the Notes to the Consolidated Financial Statements in this Annual Report on Form 10-K.
For 2022, net cash provided by operating activities consisted of $39.7 million in net income and $24.9 million in non-cash items, offset by $28.9 million in working-capital changes. For 2021, net cash provided by operating activities consisted of $27.5 million in net income and $18.8 million non-cash items, offset by $2.4 million in working-capital changes.
For 2022, cash provided by operating activities consisted of $39.7 million in net income and $24.9 million in non-cash items primarily related to stock-based compensation expenses, offset by $28.9 million in working-capital changes primarily related to changes in accounts receivable. Since 2022 we decided to invest our cash in investments available for sale, in accordance with our investment policy.
In 2024, we intend to increase the number of strategic collaborations with leading refractive surgeons and practices in the U.S. to collaborate on marketing, training and education activities. In addition, we are investing in enhanced systems and tools to make ordering and fulfillment faster and easier.
Across our markets, we 35 recognize the need to further educate and train ophthalmic surgeons about our ICLs and our ICL procedure. In 2025, we intend to increase the number of strategic collaborations with leading refractive surgeons and practices in the U.S. to collaborate on marketing, training and education activities.
As the Company has focused its business and strategy on its ICL product offerings, we have phased out our cataract IOL product line. For the year ended December 29, 2023, the Company reported worldwide revenue of $322.4 million, 99% of which was generated from sales of ICLs. See Item 1.
Historically, the Company also manufactured and sold intraocular lenses (or IOLs) for use in surgery to treat cataracts. As the Company has focused its business and strategy on its ICL product offerings, we have phased out our cataract IOL product line. For the fiscal year ended December 27, 2024, approximately 100% our net sales were generated from sales of ICLs.
For 2021, cash used in investing activities resulted from $13.6 million in purchases of property, plant and equipment. Our investment in property, plant and equipment during 2023 and 2022, and the increase during 2022, relative to 2021, was primarily due to investments in manufacturing facilities.
Our investment in property, plant and equipment during 2024, 2023 and 2022, was primarily due to investments in manufacturing facilities. For 2024, cash provided by financing activities of $5.7 million consisted primarily from the exercise of stock options of $7.4 million, partially offset by $1.5 million to repurchase employee common stock for taxes withheld.
Days’ Inventory on Hand (DOH) was 142 and 94 days for 2023 and 2022, respectively, for finished goods, including consignment inventory. The increase in DOH was due to a planned increase of production to support sales growth of ICL products. 39 Critical Accounting Estimates Our accounting policies are more fully described in Note 1 of the Consolidated Financial Statements.
Days’ Inventory on Hand (DOH) was 194 and 142 days for 2024 and 2023, respectively, for finished goods, including consignment inventory. In fiscal 2023 and fiscal 2024, we increased our production and inventory to support anticipated sales growth of ICL products and to support quick and efficient delivery and fulfillment for surgical procedures.
The increase in net sales was due to increased ICL sales of $56.8 million, partially offset by a decrease in other product sales of $2.9 million. Changes in foreign currency unfavorably impacted net sales by $12.9 million. Total ICL sales for 2023 increased 18% from 2022, with unit growth up 19%.
Changes in foreign currency unfavorably impacted ICL sales by $2.7 million, which impacted our Japan and Europe, Middle East and Africa markets. ICL sales represented 99.6% of our total sales for fiscal year 2024. Total ICL sales for 2023 increased 18% from 2022, with unit growth up 19%.
General and administrative expenses for 2022 increased 24.0% from 2021, due to increased facilities costs, bonus and stock-based compensation expenses, outside services and salary-related and payroll tax expenses.
Selling and marketing expenses for 2023 increased 21.4% from 2022, due to increased advertising and promotional activities, salary-related payroll tax expenses, sales commission expenses and travel expenses, partially offset by bonus and stock-based compensation expenses.
We want to be the first choice for doctors and for patients seeking visual freedom from wearing eyeglasses or contact lenses. As more patients look to ICLs as a potential treatment option, we recognize the need to further educate and train ophthalmic surgeons about our ICLs and our ICL procedure.
We want to be the first choice for doctors and for patients seeking visual freedom from wearing eyeglasses or contact lenses. A key focus in 2025 will be supporting our business in China as we work to navigate the macroeconomic challenges and position the Company for growth once the market recovers.
ICL sales represented 99.1% of our total sales for fiscal year 2023. Total ICL sales for 2022 increased 27% from 2021, with unit growth up 33%.
Other product sales represented 1.0% of our total sales for fiscal year 2023.
The sales increase was driven by the APAC region, which grew 32% with unit growth of 36%, primarily due to sales growth in other APAC Distributors up 43%, China up 38%, India up 37%, Korea up 18% and Japan up 14%.
The decrease in the APAC region was driven by decreased sales in China, primarily related to the $27.5 million order in December 2024 for which we did not recognize revenue discussed above, partially offset by sales growth in India, other APAC Distributors, Japan and Korea.
We do not expect this decision to have a significant impact to revenue growth in future years. Other product sales for 2023 decreased 80% from 2022, mainly due to decreased sales of cataract IOLs, decreased sales of cataract IOL injector parts and increased sales return reserves related to cataract IOLs.
During 2023, we stopped manufacturing cataract IOLs, and we did not sell any cataract IOLs in 2024. Other product sales for 2024 decreased 55% from 2023, mainly due to decreased sales of cataract IOLs and cataract IOL injector parts, partially offset by increased sales of delivery systems. Changes in foreign currency unfavorably impacted other product sales by $0.1 million.