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Proceedings Paper

Automatic Optical Measurement Of Contact Lenses
Author(s): C J Elliott
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Paper Abstract

Smith Associates is automating the operation of a contact lens factory. The latest stage of this project involved the development of an automatic radiuscope to measure the properties of the back face of the lens. The equipment developed was based on an existing manual radiuscope. A solid state video camera was installed in place of the eyepiece, and stepper motors used to drive the manual controls. An image processing computer, derived from Smith Associates' PIX system, was used to carry out the image processing and control the stepper motors. The equipment has been in service under factory conditions since mid 1985. It has been found that the measurements made by the equipment are about an order of magnitude more accurate than those made by a person using the same optical system. Also, a number of measurements are made which could not be made manually. These include surface finish, toricity and eccentricity of the back face of the lens.

Paper Details

Date Published: 17 November 1986
PDF: 5 pages
Proc. SPIE 0654, Automatic Optical Inspection, (17 November 1986); doi: 10.1117/12.938279
Show Author Affiliations
C J Elliott, Smith Associates Limited (England)


Published in SPIE Proceedings Vol. 0654:
Automatic Optical Inspection
Lionel R. Baker; H. John Caulfield, Editor(s)

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