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描述了人眼光焦度的测量原理。设计了一套光焦度测量采集处理系统。该系统是以一束红外脉冲光射入眼底 ,由CCD接受反射的眼底图像 ,将CCD图像进行数字化处理并存入SRAM。CPU采用重心法计算图像环中心坐标 ,以扫描法计算图像环的长、短轴 ,最后计算出人眼的光焦度值。研究结果表明 ,光焦度测量采集处理系统工作可靠、实用 ,能准确地测量人眼光焦度值
Describes the principle of measurement of human power. A set of optical power measurement acquisition processing system was designed. The system is a beam of infrared light into the fundus of the eye by the CCD to accept the reflected fundus image, the CCD image is digitized and stored in SRAM. The CPU uses center of gravity method to calculate the image ring center coordinates, the scanning method to calculate the image ring length, short axis, and finally calculate the human optical power value. The results show that the optical power measurement acquisition and processing system is reliable, practical and can accurately measure the human optical power value