Journal of the Korean Ophthalmological Society 2004;45(1):99-104.
Published online January 1, 2004.
Effect of Spherical Lens Induced Aniseikonia on Binocular Function.
Young Ju Lew, Marvin Lee, Ho Min Lew, Jong Bok Lee, Yoon Hee Chang
1Department of Ophthalmology, Ajou University College of Medicine, Suwon, Korea.
2Department of Ophthalmology, Yonsei University College of Medicine, Seoul, Korea.
구면렌즈로 유발된 부등상시가 양안시 기능에 미치는 영향
유영주 ( Yu Yeong Ju ) , 이마빈 ( Lee Ma Bin ) , 유호민 ( Yu Ho Min ) , 이종복 ( Lee Jong Bog ) , 장윤희 ( Jang Yun Hui )
To study the effect of spherical lens induced aniseikonia on stereopsis and fusion. METHODS: One hundred subjects, with normal binocular function without any ophthalmic disease or surgery history, were examined. The aniseikonia was induced with spherical lenses in 1 diopter (D) stepwise manner from -2 D to +2 D. The amount of aniseikonia was measured by Awaya's New Aniseikonia Test. Stereopsis and fusion were determined with Titmus Stereo Test and fusion card of major amblyoscope respectively. RESULTS: As the amount of aniseikonia was increased, the stereopsis and fusion were decreased. The change was statistically significant (ANOVA, p<0.001). Aniseikonia was more correlated to fusion than stereopsis. A significant decline in the stereopsis was detected when the size of aniseikonia changed from 1% to 2%. A significant decline in fusion was noticed when aniseikonia changed from 2% to 3% (Independent t-test, p<0.01). CONCLUSIONS: Our study suggests that binocular function can be disturbed by experimentally induced aniseikonia in normal subjects and that stereoacuities and fusional amplitude can be decreased as the degree of aniseikonia becomes larger.
Key Words: Aniseikonia;Fusion;Stereopsis

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