Adaption of lensmeter optics for minimizing contact lens spheric

Details Adaption of lensmeter optics for minimizing contact lens spheric Adaption of lensmeter optics for minimizing contact lens spheric

1991-05-07

1993-03-30

Rosenberger, Richard A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

051988674

ABSTRACT:
Adaptions of lensmeter optical trains are disclosed for enabling the measurement of contact lenses without the interference of spherical aberration from the highly meniscus lens formats of contact lenses. A generic system of measurement of the contact lenses when off of the eye is introduced by having light incident to or passing from the suspect contact lenses at an approximate aplanatic condition of the contact lens. The approximate aplanatic condition is determined by taking the average power of the posterior and anterior surfaces of the contact lenses for the general population--approximately 8 mm, assuming an index of refraction of approximately 1.5--calculating the aplanatic condition for such a "surface," and having light incident on the lenses for the interrogation of the lenses approximate the aplanatic condition. Modification of four optical trains for contact lens measurement is disclosed, including a Badal type optical train, a typical focusing lensmeter, an automated lensmeter utilizing mask pattern with photodetector array, and a lens system with a matrix of light focusing lenses.

REFERENCES:
patent: Re30804 (1981-11-01), Lindemann et al.
patent: 4176920 (1979-12-01), Ito
patent: 4180325 (1979-12-01), Humphrey
patent: 4182572 (1980-01-01), Humphrey
patent: 4247176 (1981-01-01), Ito
patent: 4779979 (1988-10-01), Iwane
patent: 4828385 (1989-05-01), Fukuma et al.
"Production Testing Method for Wide-Angle Domes" SPIE vol. 193, Optical System Engineering, 1979 pp. 265-267, D. Shafer.

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