System for producing selective stabilization of a portion of the

Details System for producing selective stabilization of a portion of the System for producing selective stabilization of a portion of the

1983-06-13

1985-10-01

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351210, A61B 310

Patent

active

045442460

ABSTRACT:
A system is provided for producing a stabilized visual scotoma or aperture which comprises means for projecting the image of a visual scene along a first optical path including first and second mirrors positioned serially along the optical path. Both mirrors are mounted for rotation about an axis corresponding, respectively, to horizontal and vertical eye movements. Optical means are provided for forming an image of the eye at each of the first and second mirror with the center of rotation of the eye in each image nominally at the axes of rotation of the first and second mirrors. Control means are provided to rotate the first and second mirrors about their axes in response to eye movements. Means are provided to project an image of the scene along a second optical path to the eye of the subject including means capable of negating the compensating effect for eye movement in the first optical path. An obscuration member, which may be either an aperture or an opaque target, is positioned between the first optical path and the second optical path to respectively form an aperture or a scotoma of predetermined size and/or shape on the retina which is stabilized with respect to eye movement while the remainder of the visual scene is not.

REFERENCES:
patent: 4264152 (1981-04-01), Crane

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