Microscope with correlatable fixation target

Details Microscope with correlatable fixation target Microscope with correlatable fixation target

1985-05-16

1986-09-30

Henry, Jon W.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

350526, 350527, 351211, 351221, A61B 310, G02B 2106, G02B 2122

Patent

active

046144110

ABSTRACT:
The invention contemplates a binocular ophthalmological operation microscope with an optical fixation mark defined as effectively a point source of light, at the output end of an optical-fiber cable, wherein the output end faces the patient on the mechanically central axis of the microscope, i.e., on an alignment centered between and in the geometric plane defined by the respective binocular-viewing axes. The illumination system for the optical-fiber cable has provision for selective adjustment of the brightness of light output from the cable, thereby permitting selection of a brightness level which is comfortable to the patient and which also enables the observing physician to see the optical-fiber output as a cornea-reflected light spot, within his field of view. The spot size is small compared to the diameter of the observed pupil, so that the physician can know (from reflected-spot position, in relation to observed pupil position) when the patient's viewing axis and the physician's view of the reflected spot are exactly correlated.

REFERENCES:
patent: 3879113 (1975-04-01), Howland et al.
patent: 3909106 (1975-09-01), Buhter
patent: 4196979 (1980-04-01), Kohayakawa et al.
patent: 4279478 (1981-07-01), Matsumura
patent: 4436388 (1984-03-01), Takahashi et al.
patent: 4443079 (1984-04-01), Crane
patent: 4477159 (1984-10-01), Mizuno et al.
patent: 4478499 (1984-10-01), Hoerenz

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