Optotype projector apparatus with variable contrast

Details Optotype projector apparatus with variable contrast Optotype projector apparatus with variable contrast

1996-10-22

1998-11-10

Mai, Huy

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Subjective type

351243, A61B 302

Patent

active

058351914

ABSTRACT:
An optotype projector apparatus provided with variable contrast, and having a large variety of optotypes and matrices for providing tests for stereoscopic vision of chromatic balance and comprising a projector for producing contrasting variations of the optotype images operating on the basis of two complementary light sources, one provided by a primary body and the other provided by a secondary body, both of which are remotely controlled so that by diminishing the intensity of one source, a consequent increase of the other source takes place. The primary body is provided with a ferrule for controlling the movement of a guide to focus an objective lens, and the primary body emits a first light beam towards the objective lens along a first axis, the secondary body emits a second light beam along a second axis, a beam controller directs the second light beam through the objective lens along the first axis onto a specific area of the screen, and the optotypes are moved past the path of the first light beam to vary the optotype projected onto the screen, and the matrix is moved past the first light beam.

REFERENCES:
patent: 3684355 (1972-08-01), Molner
patent: 4155632 (1979-05-01), Wolbarsht
patent: 4572630 (1986-02-01), Task et al.
patent: 4861156 (1989-08-01), Terry

Affiliated with

Also associated with

Rating

Optotype projector apparatus with variable contrast does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1522007