Working distance detecting device for ophthalmic instruments

Details Working distance detecting device for ophthalmic instruments Working distance detecting device for ophthalmic instruments

1981-07-31

1984-08-28

Corbin, John K.

Optics: eye examining, vision testing and correcting

Eye examining or testing instrument

Objective type

351208, A61B 314

Patent

active

044681046

ABSTRACT:
A working distance detecting device for ophthalmic instruments has two annular slits in the illuminating system. One of the annular slits has a light-shading portion of a predetermined width. A light-receiving portion is provided around the object lens so as to receive beams of light reflected at the cornea of the eye to be examined. The working distance can be detected at the light-receiving portion by the image of the light-shading portion of the annular slit.

REFERENCES:
patent: 4253743 (1981-03-01), Matsumura

Affiliated with

Also associated with

Rating

Working distance detecting device for 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 Working distance detecting device for ophthalmic instruments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Working distance detecting device for ophthalmic instruments will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-874816