Automated detection of ocular focus.
Automated detection of ocular focus.
复制标题
自动检测眼部焦点。
DOI：
10.1117/1.1781669
复制
发表时间：
2004
影响因子：
3.5
通讯作者：
Guyton,DavidL
中科院分区：
文献类型：
--
作者：
Hunter,DavidG;Nusz,KevinJ;Gandhi,NaineshK;Quraishi,ImranH;Gramatikov,BorisI;Guyton,DavidL
We characterize objectively the state of focus of the human eye, utilizing a bull’s eye photodetector to detect the double-pass blur produced from a point source of light. A point fixation source of light illuminates the eye. Fundus-reflected light is focused by the optical system of the eye onto a bull’s eye photodetector [consisting of an annulus (A) and a center (C) of approximately equal active area]. To generate focus curves,is measured with a range of trial lenses in the light path. Three human eyes and a model eye are studied. In the model eye, the focus curve showed a sharp peak with a full width at half maximum (FWHM) of ±0.25 D. In human eyes, the ratiowas >4 at best focus in all cases, with a FWHM of ±1 D. The optical apparatus detects ocular focus (as opposed to refractive error) in real time. A device that can assess focus rapidly and objectively will make it possible to perform low-cost, mass screening for focusing problems such as may exist in children at risk for amblyopia. ©2004 Society of Photo-Optical Instrumentation Engineers.
