Ophthalmic instruments

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Subjective type

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

351226, 351243, A61B 302

Patent

active

044202296

ABSTRACT:
A Friedmann analyser wtih an arrangement of fixed and rotatable shutters for displaying different patterns of light spots to a subject has a screen for displaying to the operator each light spot pattern selected by illumination of a series of light-emitting elements at fixed positions over the screen area. The light-emitting elements are actuated by a fixed array of infra-red emitting and receiving elements that direct radiation onto a binary-coded reflective pattern displaceable with the rotatable shutter and sense the radiation reflected by said pattern so that with the displacement of the shutter different reflected code signals are sensed associated with respective shutter light patterns displayed to the subject.

REFERENCES:
patent: 4145123 (1979-03-01), Krahn

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Ophthalmic instruments does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Ophthalmic instruments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ophthalmic instruments will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-802259

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.