Ophthalmic diagnostic method and apparatus

Details Ophthalmic diagnostic method and apparatus Ophthalmic diagnostic method and apparatus

1989-06-09

1990-07-03

Dzierzynski, Paul M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351221, A61B 210

Patent

active

049385844

ABSTRACT:
An ophthalmic diagnostic method and apparatus measures the distance between the corneal surface and the fundus of an eye being examined by projecting a beam of coherent light at the eye and varying the wavelength of the coherent light while observing differences between the optical paths of two light waves reflected by the cornea and the eye fundus. The differences are based on the length of the optical axis of the eye and observed as a phase difference between the two light waves. The length of the optical axis of the eye being examined can be measured from the amount of change in the measured phase difference corresponding to the variation in wavelength, enabling the length of the optical axis of the eye to be measured without mechanical control.

REFERENCES:
patent: 4650302 (1987-03-01), Grant
patent: 4764006 (1988-08-01), Hamano et al.

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