Abstract: This experiment was undertaken by using flicker method with 3 no-rmal vision experienced adult subjects. A white light and 3 spectral lights(670、560 and 450 nm) were used as stimulus lights; 4 visual feilds wereused about 2°、1°、0. 5°and 0. 25°; 3 levls of luminance were 200、20 and 2cd/m~2. The results indicate that 1) At any given luminosity level and withinthe same size of visual field, all CFF of green light turn out to be higherthan those of red and blue lights significantly. 2)Under the same lumino-us condition, CFF of both white light and various monochromatic lightsincrease as the visual field become larger. Furthermore, these changes tendto be linearly interrelated, that is to say, CFF increases with the logari-thim area of visual field nearly. 3)At various luminosity levels, slops oflines denoting CFF to log area of visual field varied, The slop at 2 cd/m~2is smaller than those of others.

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