Abstract: The Sensitivity for red and green light vision under several chroma-tic adaption conditions were studied by using threshold method. The res-ults show that: (1) when the stimulus light target and the backgroundlight (adaptation light)are both steady, there exists obvious opponent ef-fects in sensitivity for red and green light vision; (2) when the stimuluslight target flickers and the background light is steady, the opponent eff-ect is obviously diminished; (3) when background light flickers whilethe stimulus light target is steady, there still exists obvious opponentresults in red and green light vision and sensitivity increases.

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