Fig. 2
From: Biometry and visual function of a healthy cohort in Leipzig, Germany
“Contrast sensitivity measured with the Visual Contrast Test System chart and its association with age”. Caption: Contrast sensitivity for all age groups: ● 20–29 years; x 30–39 years; □ 40–49 years; + 50–50 years; ∆ 60–69 years. Gratings examined consisted of spatial frequencies of 1.5, 3, 6, 12 and 18 cycles per degree