Pupil measuring device

Details Pupil measuring device Pupil measuring device

2007-08-14

2007-08-14

Schwartz, Jordan (Department: 2873)

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

C351S221000

Reexamination Certificate

active

11092046

ABSTRACT:
A pupil measuring device includes a portion that is positioned adjacent to a subject's eye and which includes a plurality of concentric circles on a lens as well as an opaque film that moves to cover the circles. Each circle is marked and the film is aligned with the subject's pupil to be circumjacent thereto. The diameter of the pupil can then be read manually or using electronic circuits with the opaque film being used as the indicator of the measurement.

REFERENCES:
patent: 2364844 (1944-12-01), Fuog
patent: 2371999 (1945-03-01), Isaacson
patent: 2612893 (1952-10-01), Engelmann
patent: 4007980 (1977-02-01), Bracher et al.
patent: 4256385 (1981-03-01), Cohen et al.
patent: 5599276 (1997-02-01), Hauptli et al.
patent: 5975700 (1999-11-01), Koest
patent: 6022109 (2000-02-01), Dal Santo
patent: 6217172 (2001-04-01), Shibutani et al.

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