Geometrical instruments – Gauge – Lens
Patent
1984-11-20
1987-05-19
Little, Willis
Geometrical instruments
Gauge
Lens
33169B, 33613, 51216LP, B24B 1300
Patent
active
046656243
ABSTRACT:
An apparatus for analyzing a soft contact lens by allowing inspection of the lens and measurement of its diameter, sagittal depth, and center thickness includes a lens holder comprising a handle and a lens chamber. The chamber has horizontally adjustable walls, a transparent movable lid, and a floor with a centrally located opening smaller than the diameter of a lens. The lens diameter can be read from a scale on the floor of the chamber and the walls of the chamber can then be spaced according to the measured diameter to center the lens over the opening. A probe remotely operable from outside the chamber is inserted through the opening in the chamber floor and moved vertically until its tip contacts the concave side of the lens. The sagittal depth of the lens is read from a scale associated with the probe. The probe, supporting the lens, can then be moved even further upwardly until the convex side of the lens contacts the ceiling of the chamber, as determined visually or by noting the conjunction of the lens with its reflection in the chamber lid. The center thickness is measured with another scale associated with the probe.
REFERENCES:
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patent: 3769714 (1973-11-01), Anderson
patent: 3820899 (1974-06-01), McCormack
patent: 3917391 (1975-11-01), Padula
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patent: 4323850 (1982-04-01), Dawson
patent: 4403420 (1983-09-01), Rarick
MJA Post, Contact Lens Monthly, reprinted from the Optician, Feb. 2, 1982.
Optimec Services Ltd., Model JCF brochure.
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