Method for evaluation of length of focus of the eye

Details Method for evaluation of length of focus of the eye Method for evaluation of length of focus of the eye

1995-06-06

1996-11-19

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351209, 351246, A61B 310, A61B 314, A61B 300

Patent

active

055767800

ABSTRACT:
An autorefractor utilizes two light emitters and corresponding optics to project images onto the fundus, with the focus of these images bracketing the gross sphere of an emmetrope. A single detector generates a signal corresponding to each emitter. In an alternate embodiment, a single emitter and two detectors having foci bracketing the gross sphere of an emmetrope generate a signal corresponding to each detector. The light reflected from the fundus is detected and the differential intensities of two signals are used to determine departure in refraction from 0 diopter sphere. Multi-segmented or CCD detectors may be used to measure cylinder/axis, determine length and direction of gaze (in combination with a Purkinje image sensor) and to generate and analyze retinal images.

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