Abstract

In the classic frequency-of-seeing experiment with a small brief stimulus, the overall efficiency F is 0.06 (λ = 507 nm) in conventional long experiments and 0.09 in pooled short experiments. These results can be reconciled by postulating higher-level effects in the long experiments, which increase variability without substantially changing mean threshold. The quantum efficiency of dark-adapted vision Fd, the fraction of corneal photons acting at the decision level, is estimated to be 0.13–0.20 (maximum range, 0.12–0.30).

© 1987 Optical Society of America

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