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A computer-interfaced vertometer system for contact lenses

Collins, Michael J., Goode, Andrew, Davis, Brett A., & Tait, Alan (1997) A computer-interfaced vertometer system for contact lenses. Optometry and Vision Science, 74(1), pp. 59-65.

Abstract

BACKGROUND: The conventional vertometer (lensometer) is difficult to use for accurate measurement of contact lenses whose back vertex power (BVP) varies across the optic zone. BVPs of multifocal rigid and soft contact lenses have previously been measured using a conventional vertometer incorporating the Scheiner principle, which makes use of two light paths equidistant from the center of the lens. METHODS: We have developed a computer-based vertometer system based on the Scheiner principle which can be used to produce a profile of BVPs across rigid and soft contact lenses. A computer interface to the vertometer allows rapid acquisition of readings and software-based ray tracing derives in-air dioptric power readings across the optic zone at specific ray heights. RESULTS: Results are presented for soft and rigid, and spherical and aspheric surface contact lenses. CONCLUSIONS: The system improves the measurement resolution of a standard vertometer and shows an acceptable level of precision and accuracy for most applications.

Impact and interest:

3 citations in Scopus
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3 citations in Web of Science®

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ID Code: 1447
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal’s website (see hypertext link) or contact the author. Michael Collins, email: m.collins@qut.edu,.au
Additional URLs:
ISSN: 1040-5488
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 1997 Williams Wilkins
Deposited On: 06 Jun 2005
Last Modified: 15 Jan 2009 16:39

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