Process and apparatus for measuring axial eye length

Details Process and apparatus for measuring axial eye length Process and apparatus for measuring axial eye length

1992-04-15

1994-09-13

Sikes, William L.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351205, 351221, 351246, A61B 310

Patent

active

053473272

ABSTRACT:
A process and apparatus for measuring an axial eye length takes the steps of projecting monochromatic coherent light of which wavelengths are variable onto an eye to be tested, causing an interference between reflected light from a retina of the eye and reference light corresponding to the retina to generate interference signals while reflected light from a cornea of the eye is interfered with reference light corresponding to the cornea to generate interference signals, mixing these interference signals to generate beat signals while varying the wavelength, and measuring an axial eye length based on the beat signals.

REFERENCES:
patent: 4764006 (1988-08-01), Hamano et al.
patent: 4938584 (1990-07-01), Suematsu et al.
patent: 5042938 (1991-08-01), Shimozono
patent: 5141302 (1992-08-01), Arai et al.

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