Both naked and corrected vision were tested on 4,271 coll,ege entrants in 1987` (2,627 male and 1,644 female) by using Han´s vision test chart. Vision of each eye tested was analyzed by demographic variables such as age, sex and geographic locations where the students were grown-up.
Naked vision showed bimodal distribution with the highest frequency in a group with normal vision and a group with the high degree near-sighted (0.2 or less) in both male and female students. Corrected vision, on the other hand, showed unimodal distribution with the highest frequency in ´a group with normal vision.
A distinct, difference in the distribution of near-sighted vision between sexes was found showing the higher. rates in female than in male students (p < 0.01). Even in corrected visions 50% or more of the eyes showed the normal vision in the male students and the rate of corrected vision was lower in female students with 40 To or more (p<0.01).
No difference in distribution of vision was found between right and left eyes, age groups, and geographic locations where the students were. grown-up.
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