A reflective layer of the choroid in the eyes of many animals, causing them to shine in the dark.
- Passing over the ship's holds I look down upon sedate shoals of crescent-tailed bigeyes, their reflective tapetums looking like silver cataracts.
- This ‘eyeshine’ is not the iris color but that of the vascular membrane - the tapetum - showing through the translucent pigment layer on the surface of the retina.
- A layer of tapetum at the back of their eyes greatly increases their ability to see at night as well; this also makes their eyes glow in the dark.
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