Light deprivation into adulthood slows cone-driven responses. Dim flash kinetics of rod and cone responses from normal-reared (nr) and dark-reared (dr) retinas calculated from R_dim (see Materials and methods). (A) Normalized, representative rod- (left) and cone-driven (right) a-waves in response to dim flashes illustrate waveform kinetics at P14 and maturity. (B–D) Individual retina response properties to dim flashes (closed = nr, open = dr) plotted across postnatal age. (B) Exclusively, mature cone responses in dark-reared retinas exhibited a significant increase in t_peak (adult_{, cones}: n = 10 and 16, P = 0.0025, 64 ± 2 ms and 90 ± 8 ms). (C and D) Dark-rearing had little effect on the recovery time constant (τ_rec; C) and integration times (t_int; D) in both rod- and cone-driven responses. The black bar represents the population mean. Double asterisks indicate a P value of <0.01.