Optometric Personnel Act Article 17

When the principal optometric personnel of an optometric lab fail to perform their duties for a specific reason, a personnel member with the qualifications specified in Paragraph 2 of Article 15 shall be designated as the representative. If the acting period exceeds 45 days, the representative shall report to the original agency that issued the practice license for future reference.The acting period as mentioned above shall not exceed one year.
中文原文 驗光人員法第17條
驗光所之負責驗光人員因故不能執行業務時,應指定合於第十五條第二項規定資格者代理之。
代理期間超過四十五日者,應由被代理者報請原發開業執照機關備查。
前項代理期間,最長不得逾一年。

English translation for reference only; the Chinese text prevails. Not legal advice.