microphthalmoscope

This paper has explained the principle for which the small aperture glasses have some positive effects on the vision for the myopic and the hyperopic, and discussed the craft for making the small aperture glasses.

解释小孔眼镜对近视眼和远视眼都有助视作用的原理， 讨论小孔眼镜的制作工艺。

It is proved that a small circular aperture has the positive and minus focal distances,and the research experiments for small aperture glasses are introduced concisely.

提出了证明小圆孔具有正、负焦距的一种方法，简要地介绍了关于小孔眼镜的实验研