Also in contrast to a camera, your photoreceptors are unevenly distributed, with no receptors for dim light in the very center. This is why faint stars seem to disappear when you look directly at them. 另外一個眼睛和相機不同之處在於你的光感受器並不平均分佈;在最中間的地方,沒有對昏暗光線的接收器。這就是為什麼當我們直視微弱的星光時,星星會消失不見。