Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1987-07-13
1988-11-15
Rosenberger, R. A.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
G01B 900
Patent
active
047844850
ABSTRACT:
Apparatus to measure the size of an optic zone of a lens, particularly a contact lens or intraocular lenses, and the refractive power of that optic zone includes an illumination system with a light source and a first lens train producing a collimated beam of light from the light source, and a second lens train including an observation system coaxial with the illumination system and focusing the collimated beam so that the observation system allows an observer to observe a magnified image of the lens to be measured. The lens to be measured is disposed on a mounting plate positioned in the collimated light beam between the first and second lens trains. A planar knife edge is positioned within the focused light beam of the second lens train so that it occludes a part of that beam. A micrometer or similar device is attached to the mounting plate so as to measure the observed size of the optic zone or zones of the lens. The distance between the light source and the first lens train is variable to allow the refractive power of the optic zone or zones of the lens to be determined.
REFERENCES:
patent: 2624237 (1953-01-01), Davis
patent: 4395120 (1983-07-01), Takahashi
patent: 4402609 (1983-09-01), Kuppenheimer, Jr.
"The Measurement of Microscopic Objects", Naegeli et al, The Microscope in Theory and Practice, Swann Sonnenschein, Lowrey & Co., 1887, pp. 289-291.
"An Automatic Focusing Device for Ophthalmic Lenses", Whitney, American Journal of Optometry and Archives, vol. 35, pp. 182-190.
Cooper Crystal
Rosenberger R. A.
Striker Michael J.
Unisearch Limited
LandOfFree
Contact lens zonometer does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Contact lens zonometer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Contact lens zonometer will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1100597