Instrument for optically measuring soft contact lens parameters

Details Instrument for optically measuring soft contact lens parameters Instrument for optically measuring soft contact lens parameters

1980-02-04

1981-08-11

Rosenberger, R. A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

042831393

ABSTRACT:
Apparatus is disclosed for determining, with improved accuracy, the back vertex power of a hydrated soft contact lens. The increased accuracy is determined by sequentially using several optical modes to provide additional information needed to accurately calculate back vertex power. Lens thickness, sagittal height and posterior radius values are also accurately obtained with the apparatus.
Optionally, a mode for determining lens radius and thickness is also disclosed.

REFERENCES:
patent: 3804523 (1974-04-01), McCormack
patent: 3822096 (1974-07-01), Wilms
patent: 3985445 (1976-10-01), Tagnon
patent: 4033696 (1977-07-01), Nohda
patent: 4130361 (1978-12-01), Humphrey
Wray, L., "The Measurement of Hydrophilic Contact Lenses; Part I", The Ophthalmic Optician, Apr. 1, 1972, p. 256t.
Wray, L., "The Measurement of Hydrophilic Contact Lenses, Part II", The Ophthalmic Optician, Apr. 15, 1972, pp. 301-304t.

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