Optical instrument for aiding eyesight

Details Optical instrument for aiding eyesight Optical instrument for aiding eyesight

1990-07-20

1991-08-20

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

With antiglare or shading

351 41, 351158, G02C 716

Patent

active

050408879

ABSTRACT:
An optical instrument comprises a housing having a viewing aperture at the proximal end and an opening at the distal end for entry of light. A body in the housing rotates on an axis normal to the optical axis. The body has a pair of segments having linear edges parallel to the plane defined by the axis of rotation and the optical axis. As the body rotates in one direction both edges advance toward the plane, and as the body rotates in the opposite direction the edges diverge from the plane. Preferably the body comprises two sections of a circular cylinder coaxial with the axis of rotation, the segments approximately about ninety degrees each about their common axis of rotation. The edges of the members define the opening for admission of light for viewing at the viewing aperture, and may reduce or enlarge the opening according to the positioning of the members.

REFERENCES:
patent: 1567498 (1925-12-01), Gaugler

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