Patent ID: 7255441

Claim:
A pupil measuring device comprising: a) a handle unit having a first end which is a distal end when in use, a second end which is a proximal end when in use, and a longitudinal axis which extends between the first end and the second end; b) a measuring unit mounted on the distal end of said handle and including (1) a housing, (2) a light emitting element mounted on the housing, (3) a lens mounted on the housing, (4) a plurality of concentric circles defined on the lens, (5) an indicia mark on the lens adjacent to each circle, (6) an opaque film movably mounted on the lens, the opaque film having an opening defined therein, the opaque film being movable with respect to the lens to locate the opening circumjacent to a selected one of the circles with the opening being located inside the selected circle and the opaque film being located circumjacent to the selected circle, and (7) means in the housing and connected to the opaque film for moving the opaque film; c) a light activating circuit located in said handle unit and electrically connected to the light emitting element in said measuring unit, said light activating circuit including (1) an on/off switch mounted on said handle unit, and (2) a power source in said handle unit; and d) a readout element connected to the opaque film and mounted on said handle unit.