Related Experiment Video
Updated: May 21, 2026
Comparison of Agreement and Accuracy using Binocular Wavefront Optometer with Autorefractor and Phoropter
Published on: September 16, 2025
Evaluation of myopic corneal diameter with the Orbscan II Topography System
Yi Zha1, Wangqiang Feng, Xiaohui Han
1The Second Affiliated Hospital of Wenzhou Medical College, 109 Xueyuan Road, Wenzhou, Zhejiang, China. zha_yi@hotmail.com
Background:
To assess the myopic corneal diameter with Orbscan II Topography System (Bausch & Lomb, Orbtek Inc., Salt Lake City, UT, USA).
Methods:
Four hundred sixty-two eyes of 231 myopic patients and 129 emmetropic eyes were measured with the Orbscan II system. Eyes were divided into four groups according to the spherical equivalent(SE) as follows: group 1 [emmetropic group, spherical equivalents between -0.50 D and +0.50 D (-0.50
Results:
The corneal diameter in all myopic eyes was 11.49 ± 0.36 mm. There were no significant differences between right and left eyes in the t-test for paired samples (t = -0.119, P = 0.906). Differences among four groups proved to be significant in the ANOVA (F = 4.487, P = 0.004).
Conclusions:
This article provides a detailed description and analysis of Orbscan II corneal diameter of a normal myopic population. High degree of mirror image symmetry existed in myopic corneal diameter. Spherical equivalents made a difference in corneal diameter.
