公开(公告)号：US12232808B2

公开(公告)日：2025-02-25

申请号：US17686087

申请日：2022-03-03

Applicant: Crystalvue Medical Corporation

Inventor： Chun Nan Lin ,  Kun Cheng Hsieh

IPC: A61B3/032 ,  A61B3/00

Abstract: An optotype calibration method is disclosed. The optotype calibration method includes steps of: (a) when a first optotype and a second optotype located outside an observable area, moving the observable area from an original position until the first optotype or the second optotype appears in the observable area; (b) adjusting a focus mechanism to make the first optotype and the second optotype close to each other; (c) moving the observable area back to the original position; and (d) repeating the steps (a)˜(c) until the first optotype and the second optotype align with each other.