Robert J Randle

US Patent:

47782684, Oct 18, 1988

Filed:

Feb 6, 1986

Appl. No.:

6/827185

Inventors:

Robert J. Randle - Sunnyvale CA

Assignee:

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

International Classification:

A61B 300

US Classification:

351203

Abstract:

The invention is an apparatus for training of the human visual accommodation system. Specifically, the apparatus is useful for training a person to volitionally control his focus to his far point (normally infinity) from a position of myopia due to functional causes. The functional causes could be due, for example, to a behavioral accommodative spasm or the effects of an empty field. The device may also be used to measure accommodation, the accommodation resting position and the near and far points of vision. The device comprises a number of optical elements arranged on a single optical axis (74). Several of the elements are arranged in order on a movable stage (20) in fixed relationship to each other: a light source (30), a lens (32), a target (36), an aperture (42), (48) or (52) and second lens (58). On base (18) and in fixed relationship to each other are eyepiece (70) and third lens (64). Stage (20) generates an image (72) of target (36) and the stage is movable with respect to base (18) by means of knob (22).