Company: STAA
Filing Date: 2025-12-10
Form Type: DEFA14A
Source: 0001193125-25-314435
Chunk: 0

Company: STAAR SURGICAL CO
Filing Date: 2025-12-10
Form: DEFA14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement |

| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |

| ☐ | Definitive Proxy Statement |

| ☒ | Definitive Additional Materials |

| ☐ | Soliciting Material under §240.14a-12 |

STAAR SURGICAL COMPANY (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant) Payment of Filing Fee (Check the appropriate box):

| ☒ | No fee required. |

| ☐ | Fee paid previously with preliminary materials. |

| ☐ | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11 |

SUPPLEMENT DATED DECEMBER 10, 2025, TO PROXY STATEMENT DATED SEPTEMBER 16, 2025

This supplement dated December 10, 2025 (this “Supplement”) supplements the proxy statement dated September 16, 2025,
which was first mailed to stockholders of STAAR Surgical Company (“STAAR” or the “Company”) on or about September 16, 2025. That proxy statement was supplemented by a proxy supplement dated October 13, 2025, which
was filed by STAAR with the U.S. Securities and Exchange Commission (the “SEC”) on a Current Report on Form 8-K on October 14, 2025, a proxy supplement dated October 30, 2025, which was filed by STAAR with the SEC as definitive
additional materials on Schedule 14A on October 30, 2025, and a proxy supplement dated November 17, 2025, which was filed by STAAR with the SEC as definitive additional materials on Schedule 14A on November 17, 2025. That proxy
statement, as so supplemented, is referred to herein as the proxy statement.

INTRODUCTION AND EXPLANATORY NOTE

Capitalized terms used herein, but not otherwise defined, shall have the