Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Folding
Patent
1975-04-14
1977-04-05
Sacher, Paul A.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Folding
350145, 351 16, A61B 312
Patent
active
040158985
ABSTRACT:
An ophthalmoscope-microscope having an object lens at one end of a housing and an inverting, reversing and separating prism provided in the housing in the optical axis of the object lens, a binocular viewer attached to the housing and being aligned with the optical axis of the object lens in the prism and including in one embodiment mirrors at 45.degree. to the optical axis for deflecting the bundles of rays to the left and right eyes of an observer for upright unreversed stereoptical imagery of the retina of a patient's eye. The stereoscope viewer can be replaced by a stereo microscope viewer comprising separate objective lens for left and right bundles of rays, Porro prisms for uprighting and reversing the rays from the objective lens, and eyepieces for angularly magnifying the image passing to the left and right eyes of an observer for upright stereo viewing.
REFERENCES:
patent: 3475082 (1969-10-01), Strietzel
patent: 3664730 (1972-05-01), Cardona
K. E. Schirmer, "The Upright . . . Ophthalmology" Archives of Ophthalmology, Jan. 1967, pp. 67-70, vol. 77.
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