Measuring set for determination of the sagittal depth and the av

Details Measuring set for determination of the sagittal depth and the av Measuring set for determination of the sagittal depth and the av

1978-09-21

1980-06-03

Little, Willis

Geometrical instruments

Area integrators

Electrical

33169B, 33200, A61B 508, G01B 726, G01B 728

Patent

active

042054524

ABSTRACT:
The invention pertains to a measuring set for determination of the sagittal depth and the average central curvature of soft contact lenses which consists of two measuring units based on the principle of depth gauges and the common electronic indication part. The apparatus serves for rapid and inexpensive selection of the correct contact lens according to the shape and peculiarities of the patient eye. Each measuring unit consists of a fixed part formed by a support plate, a stable conductive hollow screw, and a coaxially fitted conductor insulated from the screw and protruding above the insulation, and a movable part formed by a conductive nut bearing an insulation bushing for the protruding conductor and a scale and put on the screw.

REFERENCES:
patent: 3844047 (1974-10-01), Carson
patent: 3848339 (1974-11-01), Strasbaugh
patent: 3861048 (1975-01-01), Thompson

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