1. a unit of illuminance on a surface that is everywhere 1 foot from a point source of 1 candle. 
   一支蜡烛的点光源在每英尺表面的照度的单位。
2. A unit of retinal illumination, equal to the amount of light that reaches the retina through1 square millimeter of pupil area from a surface having a brightness of1 candela per square meter. 
   光度视网膜亮度单位，相当于每平方米有一烛光亮度的表面，通过一平方毫米的瞳孔区域，到达视网膜的光线数量
3. Colors are the result of light waves reflected on the retinal of the eyes. 
   颜色是光波反射到眼睛的视网膜上产生的结果。
4. retinal protein formed by the action of light on rhodopsin. 
   光在视紫质上发生作用而形成的视网膜蛋白质。
5. A violet, light-sensitive pigment found in the retinal cones of the eye. 
   视紫蓝质；视青紫素一种存在于眼睛的视网膜锥体上的紫色的，光敏色素

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