Abstract: In order to provide, scientific basis for the government ruling on"School Hygiene Standard of Daylight and Artificial Lighting", thispaper introduces three of the four visual tests which we have conductedto show the relationship between (1) vision sight and illumination,(2) visibility and illumination; and (3) readability of Chinese wordsand illumination. The fourth test will be introduced in another paperwhich is to follow.

Key words: NULL