1. 光度視網(wǎng)膜亮度單位，相當于每平方米有一燭光亮度的表面，通過一平方毫米的瞳孔區(qū)域，到達視網(wǎng)膜的光線數(shù)量
   A unit of retinal illumination, equal to the amount of light that reaches the retina through 1 square millimeter of pupil area from a surface having a brightness of 1 candela per square meter.
2. 屈光正常當平行光線恰好聚焦于視網(wǎng)膜并形成清晰視覺時正常眼睛的狀態(tài)
   The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.

視的英語翻譯：

網(wǎng)膜的英語翻譯：