Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
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
Carl-Zeiss-Stiftung Heidenheim/Brenz
Henry Jon W.
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