Patent ID: 7001020
Filing Date: 2006-02-21
Classification: A61B

Abstract:
1. Apparatus for obtaining spherocylinder measurement of an eye comprising: a primary emitter of a light beam imaged by optical elements to form a secondary retinal light source from said light beam on said eye's retina; a photodetector comprising a light detector for measurement of at least a first retinal image and a second retinal image of said secondary retinal light source as observed by said photodetector respectively at proximal and distal positions relative to said secondary retinal light source and generation of signals proportional to the measured images said photodetector being positioned, optically beyond said first retinal image in a near beam to detect diminutions of light in various meridians of said near beam, and optically beyond said second retinal image in a far beam to detect diminutions of light in various meridians of said far beam, wherein all elements of the detector system are in a straight line optical path, and computation means responsive to said signals for calculating said spherocylinder measurement of said eye.