Box-plots of macular ganglion cell layer-inner plexiform layer (mGCL-IPL) thickness in eyes with early age-related macular degeneration and healthy controls in the 1, 3, and 6 mm ETDRS areas; (a, b, and c), respectively. P-values shown in the figure result from the general linear model analysis adjusted for sex, age, axial length, and spherical equivalent as covariates