Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1984-02-21
1985-10-01
Perkey, William B.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
351206, G03B 2900, A61B 314
Patent
active
045442487
ABSTRACT:
An ophthalmoscopic camera comprising a photographing optical system including an objective lens adapted to be positioned opposite to a patient's eye with a working distance and an image plane on which an image of fundus of the patient's eye is formed, an illuminating optical system for projecting a beam of illuminating light to the patient's eye, a focus detecting optical system including a mark projecting system having a mark plate formed with at least one mark and located conjugate with the image plane of the photographing optical system with respect to the objective lens and an optical system for optically projecting the mark through the pupil of the patient's eye to the eye fundus. The mark projecting system includes a beam rotating device for rotating the mark projecting beam about the mark projecting optical axis.
REFERENCES:
patent: 3925793 (1975-12-01), Matsumara et al.
patent: 4265518 (1981-05-01), Matsumara
patent: 4422735 (1983-12-01), Shimizu et al.
Perkey William B.
Tokyo Kogaku Kikai Kabushiki Kaisha
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