Apparatus and method for the precision evaluation of visual func

Details Apparatus and method for the precision evaluation of visual func Apparatus and method for the precision evaluation of visual func

1988-10-11

1990-05-22

Dzierzynski, P. M.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351205, A61B 302

Patent

active

049272608

ABSTRACT:
A foveal vision evaluation instrument and procedure enables a precise evaluation of the visual function of the fovea centralis (macula) area of the retina. A foveal profile is developed to document the presence and state of foveal degeneration manifested by foveal segmentation and incremental changes and abnormalities in foveal vision, such as are caused by age related macular degeneration.
Beam source optics 10, beam polarization optics 20 and image selection system 30 provide a polarized projection beam PPB that transmits an image array obtained by directing one component of polarized projection beam PPB through an image transparency IT. Image element blanking optics 40 enables the individual elements of the image array to be selectively blanked using a multi-cell electro-optic shutter 45. Zoom projection optics 50 projects the image array onto a screen within the foveal field of vision, and allows the size of the projected image elements to be incrementally changed through selective control of zoom magnification with compensating brightness (contrast) adjustment through automatic control of iris setting.

REFERENCES:
patent: 4726672 (1988-02-01), O'Brien et al.

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