Objective To study the effect of lens induced aniseikonia on stereopsis with size lenses. Methods A prospective randomized block design was used. Two percent, 3%, 5%, 8% and 10% of aniseikonia were induced by various lens magnification in front of the right eyes of 45 subjects. Stereopsis was then tested utilizing the Stereo Fly Test and Digital Stereoscopic Test Charts (DSTC) under normal binocular vision and induced aniseikonia. The effect of induced aniseikonia on stereopsis then was analyzed based on the data collected. The data was analyzed by Friedman′s M test, Spearman rank correlation, Wilcoxon rank sum test and Kruskal-Wallis H test. Results Stereopsis was significantly affected by induced aniseikonia [FLY (x²=210.113, P<0.01, DSTC (x²=162.237, P<0.01]; stereopsis was measurably reduced by 2% aniseikonia, and drastically reduced when aniseikonia was more than 5%. The decline in stereoacuity was positively correlated with induced aniseikonia [FLY (rs=0.776, P=0.000), DSTC (rs=0.626, P=0.000)]. Conclusion Stereopsis and other aspects of binocular function are impaired if aniseikonia reaches 2%. An aniseikonia test should be performed more frequently in clinical settings.
康峥,高祥璐,张艳龙. 无焦放大镜诱导的不等像对立体视功能的影响[J]. 中华眼视光学与视觉科学杂志, 2013, 15(2): 104-107.
KANG Zheng,GAO Xiang-lu,ZHANG Yan-long. Effect of lens induced aniseikonia on stereopsis. Chinese Journal of Optometry Ophthalmology and Visual Science, 2013, 15(2): 104-107. DOI: 10.3760/cma.j.issn.1674-845X.2013.02.010