Ophthalmic measurement apparatus

Details Ophthalmic measurement apparatus Ophthalmic measurement apparatus

1991-07-16

1993-04-20

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351214, 128745, A61B 310

Patent

active

052047059

ABSTRACT:
An ophthalmic measurement apparatus projects a laser beam into an eye and performs measurements using the light scattered by floating cells in the eye. The aperture area of the mask that defines the field of measurement view is adjusted to correspond to measurement conditions in the eye. A system processor determines the number of floating cells based on signals from a photosensor disposed behind the mask aperture and corrects the cell count according to a predetermined formula. The aperture area of the mask is changed depending on the counted number of floating cells in such a manner that the size of the mask aperture is decreased when there are many cells in the eye and increased when there are few cells in the eye.

REFERENCES:
patent: 3963019 (1976-06-01), Quandt
patent: 4650301 (1987-03-01), Humphrey

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