无论是《生理卫生》教材上的盲点测试图还是杂志上介绍的“运用双拳测定盲点”的方法,初测盲点的学生都不容易很好地掌握,往往测不出盲点。究其原因,由于被测两点间的距离太近,如“+”与“○”相距约3.3cm左右。使“○”成像于盲点的书眼距离致有4cm左右的移动范围,使学生不易把握书的平衡,很容易使“○”移出盲点;同时,被测两点间的距离太近,在注视“+”时很容易迁移到“○”上去而测不出盲点。我们曾对这一实验作了改进,能克服以上缺点,效果很好,现介绍如下: Whether it is the blind spot test chart on the “Sanitation” textbook or the magazine’s method of “measuring the blind spot with both fists”, students who are blind spot in the initial test are not easy to grasp, and blind spots are often not detected. The reason, because the measured distance between two points too close, such as “+” and “○” about 3.3cm or so. So that the “○” is formed in the blind spot of the book eye distance caused by about 4cm of the movement range, so that students can not easily grasp the book balance, it is easy to make “○” out of blind spots; the same time, the distance between the two measured too close, “+” Is easy to migrate to “○” and can not detect the blind spot. We have made improvements to this experiment to overcome the above shortcomings and work very well. We have introduced the following: