Purpose.: We compared the retinal thickness (RT) and choroidal thickness (ChT) between the fellow eyes of nonamblyopic myopic anisometropes. Methods.: The eyes of 22 nonamblyopic myopic anisometropes (a?￥1 diopter [D] spherical equivalent refraction [SER] anisometropia) were examined using spectral domain optical coherence tomography (SD-OCT). Customized software was used to register, align, and average multiple foveal OCT B-scan images from each subject to enhance image quality. Two independent masked observers manually determined the RT and ChT from each SD-OCT image up to 2.5 mm nasal and temporal to the fovea. Axial length (AXL) was measured using optical low coherence biometry during relaxed accommodation. Results.: The mean SER anisometropia was 1.74 ?± 0.95 D and the mean interocular AXL difference was 0.58 ?± 0.41 mm. There was no significant difference in foveal RT between the fellow eyes (P 0.05). Mean subfoveal ChT was significantly thinner in the more myopic eye (252 ?± 46 ??m) compared to the fellow, less myopic eye (286 ?± 58 ??m) (P 0.001). There was a moderate correlation between the interocular difference in subfoveal ChT and the interocular difference in AXL (r = a??0.50, P 0.01). Asian anisometropes displayed more regionally symmetrical (nasal-temporal) interocular differences in ChT profile compared to Caucasians. Conclusions.: RT was similar between the fellow eyes of myopic anisometropes; however, the subfoveal choroid was significantly thinner in the more myopic (longer) eye of this anisometropic cohort. The interocular asymmetry in ChT correlated with the interocular difference in AXL.
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