2 results about "Eye chart" patented technology

This application discloses an automatic generation method and system for variable distance correction results of electronic vision charts, relating to the field of electronic vision testing. The method includes: obtaining the target examination distance of the examinee and configuring a target examination distance mode based on the target examination distance; performing vision testing on the examinee according to the target examination distance mode to obtain the original recognition result; extracting correction parameters corresponding to the original recognition result from the distance correction relationship, and using the correction parameters to convert the original recognition result to generate a standardized vision result; performing a format conversion on the standardized vision result according to the target format to obtain the format-converted standardized vision result; and generating a structured variable distance correction result. This application improves the automation level of variable distance correction and standardized result generation of electronic vision charts, and can perform multiple format conversions and structured recording, facilitating multi-scenario use and interconnection, and enabling collaborative product applications with existing modules.

This invention relates to the field of medical device technology, and more particularly to a tool and method for determining the optical magnification of an optical microscope. The tool includes several columns of graphic blocks drawn on a background plate. Each column of the graphic block combination includes four graphic blocks of equal size. The distance between adjacent graphic blocks is equal. The shapes and sizes of the graphics drawn on the graphic blocks in the same column are the same, but their orientations are different. The sizes of the graphics drawn on adjacent columns decrease by a factor of 1. This invention provides a new, simplified standard for optical magnification, using a method similar to a human vision chart. It is the first to utilize the human retina's resolving limit of 0.10-0.20 mm, representing a cross-disciplinary research achievement between medicine and optics. It solves the technical problem of the lack of a unified standard for determining optical magnification in the market. It can determine the performance differences between different optical magnifying glasses and different optical microscopes.