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Purpose  To investigate the characteristics of macular ganglion cell-inner plexiform layer (GCIPL) thickness profiles associated with ocular dominance.    Setting  Private practice, Seoul, Republic of Korea.    Design  Comparative case-control study.    Methods  Both eyes of 199 participants with no ophthalmic abnormalities were included. Participants were imaged by spectral-domain optical coherence tomography, and underwent dominant eye testing using a hole-in-a-card test (sighting dominance) at the same visit. Macular GCIPL, as well as circumpapillary retinal nerve fiber layer (RNFL) thickness were compared for individual patients, according to ocular dominance.    Results  Ocular dominance occurred predominantly in the right eye (right  vs . left: 72.36  vs . 27.60%;  P  < 0.001). In the comparison of macular GCIPL thickness, the average (81.27±5.01 μm  vs . 80.66±6.31 μm in dominant  vs . non-dominant eyes), inferonasal (81.39±5.47μm  vs . 80.33±6.82μm, and inferior sectors (77.95±6.05μm  vs . 76.97±8.15μm) were significantly different between dominant and non-dominant eyes ( P  = 0.040, 0.005, and 0.032, respectively). Significant predictors of average GCIPL thickness were spherical equivalent ( β  = 1.37,  P <0.001), astigmatic power ( β  = 1.44,  P  = 0.009), disc area ( β  = 3.90,  P  < 0.001), average RNFL thickness ( β  = 0.22,  P <0.001), average cup-to-disc ratio ( β  = 5.74,  P  = 0.002), difference between the inferior and superior quadrant RNFL thicknesses ( β  = 0.08,  P  = 0.024), and ocular dominance ( β  = 2.10,  P  = 0.020). On multivariate regression analysis, ocular dominance was correlated with average GCIPL thickness after adjusting for potential confounders ( β  = 1.63,  P  = 0.048).    Conclusions  Dominant eyes accompanied significantly thicker average macular GCIPL. This information suggests that macular GCIPL thickness may provide an indicator of the relative dominance of an eye.

Ocular Dominance Is Associated with the Ganglion Cell-Inner Plexiform Layer Thickness Profile in the Macula