Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1985-11-04
1988-03-08
Corbin, John K.
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
351245, A61B 314
Patent
active
047296526
ABSTRACT:
An apparatus for performing measurements on the eye of a subject includes a headrest for supporting the head of the subject in a fixed position, and a frame holding a light source directing illumination at the eye. The frame is adapted for pivotal motion about a central axis of the eye. Imaging means provides an image of the first and fourth Purkinje images of the light, and means are provided for measuring the amount of rotation of the frame. The frame may be initially aligned so that a fixation target lies in the plane defined by the central axis and the light source, and then rotated until the first and fourth Purkinje images determine a straight line parallel to the central axis, whereby the plane is aligned with the optical axis of the eye. The net rotation of the frame then gives a direct reading of the angular difference between the line to the target and the optical axis of the eye. Preferably the apparatus includes an infrared light source. The apparatus may further include a filter to selectively pass infrared light, the filter being movable into a position to block the vision of the eye. Methods of using the invention to detect squint angles and latent squint angles are disclosed.
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A New Method of Determining Squint Angle in Primary and All Secondary Positions Using First and Fourth Purkinje Images, Effert.
Accurate Two Dimensional Eye Tracker Using First and Fourth Purkinje Images; Cornsweet et al., 8-1973, Optical Society of Am., pp. 921-928.
Corbin John K.
Dzierzynski P. M.
Eye Research Institute of Retina Foundation
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