A computer-interfaced vertometer system for contact lenses
(1997) A computer-interfaced vertometer system for contact lenses. Optometry and Vision Science 74(1):pp. 59-65.
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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.
| Item Type: | Journal Article |
|---|---|
| Status: | Published |
| Subjects: | Subjects UNSPECIFIED |
| ID Code: | 1447 |
| Deposited By: | Phang, Shiau Shing (Sammy) |
| Deposited On: | 06 June 2005 |
| Alternative Locations: | http://www.optvissci.com |
| Copyright Owner: | Copyright 1997 Williams Wilkins |
| 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 |