Perimeter

Details Perimeter Perimeter

1987-01-23

1989-03-21

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351237, 351246, A61B 302

Patent

active

048137790

ABSTRACT:
A perimeter having an image projection system which projects an undistorted line target across the full range of a patient's field of vision is disclosed. The image projection system includes a projector, a bundle of optical fiber elements, and lenses associated with the optical fiber elements adapted to focus the target onto the observation hemisphere of the perimeter. The perimeter may also be provided with a fixation monitor system which monitors the patient's gaze and which will interrupt projection of the target when fixation is lost. The fixation monitor includes at least one sensor for detecting the intensity of infrared light reflected off the patient's eye, and a comparator adapted to compare the output signals from each sensor during the examination with base signals obtained at fixation. Any signal variation will indicate that fixation has been lost and projection of the target will be interrupted. Projection will resume once fixation has been reestablished.

REFERENCES:
patent: 4045130 (1977-08-01), Krahn
patent: 4146311 (1979-03-01), Murr
patent: 4483585 (1984-11-01), Takami

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