Figure 2. Effect of AO correction on Modulation transfer functions (MTFs) and Contrast sensitivity functions (CSFs) in the child and the adult groups.

(a) Modulation transfer factor with and without AO correction as a function of spatial frequency for the child and the adult groups. Modulation transfer factor of the eye denotes the contrast ratio of one particular spatial frequency that remains after the image comes through the eye; the x-axis shows spatial frequency (cycles/°). The black solid line represents the diffraction limit. Error bars indicate standard errors of the modulation transfer factors across subjects. (b) Contrast sensitivity with and without AO correction as a function of spatial frequency for the child and adult groups. Contrast sensitivity was defined as the reciprocal of contrast threshold for detecting sine-wave gratings at 79.3% correct. Error bars show standard errors of the contrast sensitivity across subjects.