Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1986-12-04
1991-01-29
Henry, Jon W.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
350146, 350545, 350435, 351159, G02B 2306, G02B 1708
Patent
active
049881779
ABSTRACT:
A prosthesis for visually handicapped persons provides for collection and concentration of available light to thereby assist the visually handicapped with seeing under conditions of reduced or diffuse lighting. The prosthesis has a single or pair of tubular housing members each of which contains an imaging lens in the portion remote from the user's eye and a concentrating lens in spaced relationship from the imaging lens and closer to the user's eye than the imaging lens. A prism may be provided between the imaging lens and concentrating lens. The concentrating lens may be generally pear-shaped and have an entrance pupil of greater diameter than the exit pupil. The convex entrance surface may have a radius of curvature of about 1.8 to 2.2 times the radius of curvature of the convex exit surface. The intermediate lens surface may be generally parabolic in configuration. The concentrating lens is preferably substantially symmetrical about its longitudinal axis. The portion of the concentrating lens surrounded by the generally parabolic surface preferably has an axial extent of about 45 to 55 percent of the total axial lenght of the concentrating lens. The lens system is also usable in microsurgery, and cameras as well as other uses.
REFERENCES:
patent: 1716308 (1929-06-01), Foster
patent: 3368078 (1968-02-01), Flint et al.
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patent: 4114592 (1978-09-01), Winston
patent: 4222371 (1980-09-01), Heath
patent: 4240692 (1980-12-01), Winston
patent: 4445766 (1984-05-01), Yamazaki
Jerome J. Wolken et al., "The Eye Structure and Optical System of the Crustacean Copepod, Copilia", The Journal of Cell Biology, 1969, vol. 40, pp. 279-285.
Henry Jon W.
Silverman Arnold B.
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