Abstract: Under both dark-adapted and light-adapted states (1×10~(-2) stilb), therecovery time (RT) from flashblindness in detecting a 6' gap of LandoltRing was measured for 11 male observers with normal vision. The resultsshow: (1) the RT increases linearly with increase of luminance from 0.45 to15 stilb under dark-adapted condition and 2 to 36 stilb under light-adaptedcondition; (2) the slope of the curve relating RT to luminance increases withincrease of exposure duration) (3) the flash luminance required to producethe same RT is about 3-5 times longer under light-adapted than that underdark-adapted condition. The experimental data may serve as a basis for the determination of thetransmission factor of the protecting glass.

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