Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – For interpupillary distance measuring or lens positioning
Patent
1996-08-21
1997-11-25
Mai, Huy
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
For interpupillary distance measuring or lens positioning
351246, 33200, A61B 310, A61B 300
Patent
active
056917996
ABSTRACT:
The present invention measures the vertical and horizontal decentration of a pupil of a patient relative to a spectacle frame. The apparatus includes a housing having a distal end defining at least one target aperture. The housing has a proximal end opposite the distal end. An eye-piece is disposed at the proximal end and permits an operator to observe the pupil of the patient through the target aperture such that the eye-piece, the target aperture, the spectacle frame, and the pupil of the patient are in operative alignment. Also included is an adjustable left, right, and center vertical reference marker, each operatively coupled to the housing and horizontally displaceable relative thereto. The left and right vertical reference markers are configured to determine the position of a temporal edge and a nasal edge of the spectacle frame, respectively, while the center vertical reference marker is configured to be vertically aligned with the center of the pupil. The left, right, and center vertical reference markers are operatively coupled to a circuit which provides an electrical signal corresponding to a measurement of a horizontal distance between the center vertical reference marker and the left and right reference markers, respectively. This horizontal distance represents horizontal decentration.
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