This study is made up of the analysis of the health records and the questionnaires on -wearing glasses and contact lenses. The subjects of 1,859 students were selected in their third grade of high school in December 1986. Those who were divided into 582´, boys and 604 girls in the liberal, and 673 boys in the vocational.
The glasses-wearing rates for boys´ liberal high school students, girls´ liberal high school students and boys´ vocational school students are 55.0%, 61.1% and 24.7%, respectively. The wearing-rates of the liberal high school students are much higher than those of the vocational high school students.
The glasses-wearing rates increase slowly in the elementary school days, but remarkably increase between. the first grade of middle school and that of high school. About 64/0 of the students wearing glasses began to wear glasses during the latter period.
The visual acuities at the time to begin to wear glasses are 0. 3, 0. 2, 0. 4 and 0. 5 in the -order. About 80% of the wearers began to wear glasses below 0.5.
In the high score rate of the preliminary examination for college, the glasses-wearing students´ rate is higher than that of the non-wearers.
Ninety-five percent or more of the causes for their poor eyesight are not genetic but just
acquired in the course of their lifetime, owing to the ´overuses of their eyes.
It appears that the wearing-rate of the glasses wearing students´ parents is higher than
-that of non-wearers´ parents (p<0.01).
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