Arrangement for test mark positioning in spheric perimeters

Details Arrangement for test mark positioning in spheric perimeters Arrangement for test mark positioning in spheric perimeters

1981-11-19

1984-12-25

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351224, A61B 302

Patent

active

044900236

ABSTRACT:
The invention relates to an arrangement for test mark positioning in spheric perimeters particularly for use in ophthalmological examinations. A semi-spherical perimeter screen has a central portion upon which a fixed mark is projected by a double projector the back-projection of which is indicated upon a visual field chart which permits recording of said back-projected fixed mark. A further projector connected to the displaceable visual field chart carrier produces discrete test marks via light cables around the central portion of said screen. Thus it is feasible to continuously detect the visual field of a patient's eye by cooperation between the patient's eye, the fixed mark and the discrete marks and by respective displacements of the projectors and hence the marks involved.

REFERENCES:
patent: 4059348 (1977-11-01), Jernigan

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