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以1982年考入某钢四中初一年级(11～12岁),并连续在校学习于1985年毕业,经体检无眼疾的体育班(每天增加1小时体育活动课)学生为指示例,匹配入学时间、入学视力水平、发育等级相同,性别、年龄、藉贯相同,与体育班同步学习三年的普通班学生为对照例,共计22对,(男、女各11对),进行1:2配对比较。采用表面照度均匀(800iux以上)的国际视力表检测远视力,再转换为对数视力进行计算。结果如下:
In 1982 admitted to a steel fourth grade (11 to 12 years old), and continued to study in 1985 graduated from physical examination without eye disease in sports classes (increase 1 hour daily physical activity class) students as an example, A total of 22 matched pairs (average of 11 pairs of boys and girls) were enrolled in this study, which matched the enrollment time, the level of school attendance, the same level of development, the same gender, age, : 2 Pair comparison. The use of surface illumination uniformity (800iux above) international visual acuity chart for the detection of distant vision, then converted to logarithmic visual acuity. The result is as follows: