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Chang-Bing Huang, Jiawei Zhou, Zhong-Lin Lu, Lixia Feng, Yifeng Zhou; Binocular combination in anisometropic amblyopia. Journal of Vision 2009;9(3):17. doi: 10.1167/9.3.17.
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Using a suprathreshold binocular summation paradigm developed by J. Ding and G. Sperling (2006, 2007) for normal observers, we investigated suprathreshold cyclopean perception in anisometropic amblyopia. In this paradigm, two suprathreshold sinewave gratings of the same spatial frequency but different spatial phases are presented to the left and right eyes of the observer. The perceived phase of the binocularly combined cyclopean image is measured as a function of the contrast ratio between the images in the two eyes. We found that both eyes contributed equally in normal subjects. However, stimulus of equal contrast was weighted much less in the amblyopic eye relative to the fellow eye in binocular combination. For the five amblyopes, the effective contrast of the amblyopic eye in binocular combination is equal to about 11%–28% of the same contrast presented to the fellow eye, much less than the ratio of contrast sensitivity between the two eyes (0.73–1.42). The results from the current study have many important implications in amblyopia research and treatment.
Note: Letter acuity was measured with the Tumbling E chart. Stereo acuity was assessed with the Titmus Stereo Test (Stereo Optical Co., Inc., Chicago, IL, USA). MAR, minimum angle of resolution; Aniso, anisometropic amblyopia. AE, amblyopic eye; FE, fellow eye.
Note: *For CCK2, the degree of freedom of the F-tests is (1, 237).
Note: The F-values represent statistics resulted from comparing the full inhibition model with the three less saturated inhibition models.
*For CCK2, the degree of freedom of the F-tests is (1, 236).
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