Name: 為什麼動物的眼睛在黑暗中會發光？ | #aumsum (Why do animals eyes glow in the dark? | #aumsum)
Uploaded: 2025-12-08T10:51:11.000Z
Duration: 1 min 1 s
Description: 【看影片學英語】數萬部 YouTube 影片，搭配英漢字典即點即查，輕鬆掌握單字發音與用法，長久累積看電影不必再看字幕。

Our eyes have a layer called retina which is made up of photo receptors.

When light enters our eyes, it hits the photo receptors.

Photo receptors detect light, thus making it possible to see.

However, the light which doesn't hit the photo receptors remains undetected.

Now, nocturnal animals like owls, need to see better during the night.

Hence, their eyes have another layer below the retina called tapetum lucidum.

Now, when light doesn't hit the photo receptors, it reaches the tapetum lucidum.

It reflects light back onto the photo receptors, thus giving them a second chance to detect light.

Some of this reflected light also comes out of the animal's eyes.

Thus, making it seem that its eyes are glowing.

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為什麼動物的眼睛在黑暗中會發光？ | #aumsum (Why do animals eyes glow in the dark? | #aumsum)

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