Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1993-03-17
1994-04-12
Gellner, M. C.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
354112, 351206, 351213, 351214, 351221, G03B 2900, A61B 310, A61B 314
Patent
active
053029887
ABSTRACT:
A stereoscopic retinal camera capable of photographing the stereoscopic picture of the fundus by dividing a light beam reflected by the fundus into two light beams and transmitting the two light beam respectively along the light paths of separate image forming optical systems, the stereoscopic retinal camera comprising photographing diaphragms having two apertures for dividing the light beam reflected by the fundus, disposed in a conjugate relation with respect to the pupil of the examinee's eye through an objective lens so that a photographing image of the fundus of the eye may appear stereoscopic properly based on a stereobase determined on the pupil, the respective apertures of photographing diaphragms having a longer vertical length than a width.
REFERENCES:
patent: 4715703 (1987-12-01), Cornsweet et al.
"A New Camera for Stereoscopic Fundus Photography", David D. Donaldson, Archives of Ophthalmology, vol. 73, pp. 253-267, Feb., 1965.
"Stereoscopic Retinal Camera", Mizuo Matsui, Ophthalmology, vol. 19, No. 10, 1977 (with abstract).
Gellner M. C.
Han J. K.
Nidek Co. Ltd.
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