Ocular parameter measuring device with digitally controlled virt

Details Ocular parameter measuring device with digitally controlled virt Ocular parameter measuring device with digitally controlled virt

1984-12-19

1986-12-02

Bovernick, Rodney B.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

For interpupillary distance measuring or lens positioning

33200, A61B 310

Patent

active

046260889

ABSTRACT:
A device for measuring a subject's ocular parameters, in particular the interpupillary distance, comprises a front plate against which the face of the subject is placed, comprising two windows substantially corresponding to the lenses of a pair of eyeglasses. A lens is movable along its optical axis, which is perpendicular to the front plate, from an origin position near the front plate. A viewing eyepiece is disposed at the focus of the lens when in the origin position. A semi-reflecting mirror disposed at 45.degree. renders the eyepiece and a point source coincident, as far as the subject is concerned. Parallel to the semi-reflecting mirror, another mirror reflects an image of a cathode ray tube screen to the eyepiece through another lens. Adjustable calibrated voltage sources are used to produce coincidence of the reflections of the source on the corneas of the eyes of the subject and the luminous traces on the screen of the cathode ray tube, as seen by an operator looking through the eyepiece. These traces constitute graticules, and the voltages which generate them constitute basic measurements of the ocular parameters. The appropriate calculations are implemented by a microprocessor.

REFERENCES:
patent: 4092567 (1978-05-01), Sharrit

Affiliated with

Also associated with

Rating

Ocular parameter measuring device with digitally controlled virt does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ocular parameter measuring device with digitally controlled virt, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ocular parameter measuring device with digitally controlled virt will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2289774