英文:The condition of the normal eye when parallel rays are focused exactly on the retina and vision is perfect.
中文:屈光正常當平行光線恰好聚焦于視網膜并形成清晰視覺時正常眼睛的狀态
英文: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.
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