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Seeing at Night
22 A cat’s eyes glow in the dark because they have a
part behind their retinas that works a bit like a
mirror. It reflects light back onto the retina. Because
more light is reflected onto the retina, the cat can
see more. That is why cats and some other animals
can see better in low light than we can.
Pupil Power
23 To let more light into your room, you open the
curtains wide. When it is nearly dark, cats’ pupils
open very wide to let as much light in as possible. In
bright light, their pupils are very narrow. This stops
their retinas from being hurt by too much light.
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