The Measurement of the Bausch & Lomb Soflens Contact Lens by Interferometry
作者:
N. EL-NASHAR,
J. LARKE,
C. BROOKES,
期刊:
American Journal of Optometry and Physiological Optics
(OVID Available online 1979)
卷期:
Volume 56,
issue 1
页码: 10-15
ISSN:0093-7002
年代: 1979
出版商: OVID
关键词: contact lens measurements;Soflens contact lens;interferometry
数据来源: OVID
摘要:
A method is described for the measurement of the anterior and posterior radii of curvature and thickness of a soft (hydrogel) contact lens. The method is based on the observation of an interference pattern that is generated by two beams of light, one reflected from the surface of the lens and the other reflected from the surface of a comparison mirror. It was found that the maximum coefficient of variation for the measured values of the anterior and posterior radii of curvature was 2% and the minimum value was 0.6%. An accuracy of 1:103 for the radii of curvature and the center thickness of the lens is claimed.
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