Figure 2.

A normal dark adaptation response. The normal 58-year-old subject is bleached with a 2-ms 5.8 × 10^4 cd m⁻² s⁻¹, 505-nm flash with the AdaptDx. Following bleaching, sensitivity recovery is tested with a 2° circular test region 5° superior to the fovea (black dots). Nonlinear regression was used to fit an exponential-linear model to the dark adaptation function (line). The model's parameters included cone plateau (1.97 log units), rod recovery rate (0.31 log units/min), and rod intercept time (9.0 minutes).