Method and system for improving accuracy in autorefraction...

Details Method and system for improving accuracy in autorefraction... Method and system for improving accuracy in autorefraction...

2003-08-14

2009-02-24

Hindenburg, Max (Department: 3736)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

C351S205000, C351S222000, C351S246000, C600S558000

Reexamination Certificate

active

07494220

ABSTRACT:
A method and associated system improve accuracy in objective refraction measurements by including the measured distance between the photoreceptors of a subject's eye and the scattering location of light during the objective refraction measurements. Chromatic aberrations in the objective measurements are also compensated. The distance between the photoreceptors and the scattering location may be determined by adjusting a distance between a rotating speckled light pattern and an eye until the speckled light pattern appears to be stationary, or by employing a Scheiner disk.

REFERENCES:
Munnerlyn, C.R., “An Optical System for an Automatic Eye Refractor,” Nov.-Dec. 1978, vol. 7, No. 6, Optical Engineering, pp. 627-630.
Cornsweet, Tom N., and Crane, Hewitt D., “Servo-Controlled Infrared Optometer,” Journal of the Optical Society of America, vol. 60(4), pp. 63-69 (Apr. 1970).

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