Fig. 2
From: Neural contrast sensitivity is not affected by myopic blur
Neural contrast sensitivity is neither correlated with the eye’s refraction nor age. (A) None of the tested correlations between observed NCS at 36 cpd and physical parameters of the eye (axial length, refraction given by spherical equivalent, or under-correction) was significant. For axial length NCS measurements were pooled across all three groups, for spherical equivalent and under-correction NCS measurements were pooled from both myopic groups. Grey dotted lines indicate 95% confidence intervals. (B) The AUC comparison between emmetropes (SE > − 0.5 D; N = 11) and myopes with SE ≤ − 4 D (N = 6) revealed a non-significant difference (p = 0.06), but significant equivalent NCSF (p = 0.02). TOST limits indicated by the dashed lines. (C) Division of the pooled data set into two age groups (22 ± 2 years and 32 ± 4 years) showed no significant difference (p = 0.48), but significant equivalence (p < 0.001). (D) Low variability for repeated measurements: 93% of repeated NCS measurements at a given spatial frequency showed a maximum difference of 0.2 log10 NCS or less between the highest and smallest value recorded. White lines indicate the mean, red lines the median value.
