An instrument for examining the interior structures of the eye, especially the retina, consisting essentially of a mirror that reflects light into the eye and a central hole through which the eye is examined.

• 检眼镜一种用来观察眼睛内部结构的仪器，尤指检查瞳孔。这种仪器主要含有一个镜子，可以反射来自眼睛和眼球中心小孔的光线，通过用它来检查眼睛