Short- and Long-Term Repeatability of Visioptic Alcon EyeMap (Visioptic EH-270) Corneal Topographer on Normal Human Corneas
- 1 November 1995
- journal article
- feature issue-on-corneal-topography
- Published by Wolters Kluwer Health in Optometry and Vision Science
- Vol. 72 (11) , 838-844
- https://doi.org/10.1097/00006324-199511000-00010
Abstract
The purpose of this study was to examine the shortterm and long-term (6 months) repeatability of the Alcon EyeMap (Visioptic EH-270)a Computerized Corneal Topographer on normal eyes. Three measurements were taken on both eyes of 39 subjects with the corneai topographer. Both eyes of seven of these subjects were measured 6 months later in order to evaluate long-term repeatability. The data showed that short-term reliability of the instrument was acceptable with a mean standard deviation (SD)<0.5 D up to 3 mm (6-mm optical zone) from the center of the normal cornea. Beyond that distance, SD's of repeated measures increased systematically, making the results less useful. Long-term repeatability of the instrument over a 6-month period was acceptable clinically, although statistically significant differences were noted.Keywords
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