Younes M, Boltz R, Leach N E, Bedell H
College of Optometry, University of Houston, Texas, USA.
Optom Vis Sci. 1995 Nov;72(11):838-44. doi: 10.1097/00006324-199511000-00010.
The purpose of this study was to examine the short-term 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 corneal 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) < or = 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.
本研究的目的是检测爱尔康眼图仪（Visioptic EH - 270），一种电脑化角膜地形图仪，在正常眼睛上的短期和长期（6个月）重复性。对39名受试者的双眼使用角膜地形图仪进行了三次测量。其中7名受试者的双眼在6个月后再次测量，以评估长期重复性。数据显示，该仪器的短期可靠性在距正常角膜中心3毫米（6毫米光学区）范围内是可接受的，平均标准差（SD）≤0.5 D。超过该距离，重复测量的标准差系统性增加，使得结果的用处降低。该仪器在6个月期间的长期重复性在临床上是可接受的，尽管存在统计学上的显著差异。
