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Cats have excellent night vision and can see at
only one-sixth the light level required for human
vision. This is partly the result of cat eyes having
a tapetum lucidum, which reflects any light that
passes through the retina back into the eye, thereby
increasing the eye's sensitivity to dim light. Another
adaptation to dim light is the large pupils of cats'
eyes. Unlike some big cats, such as tigers, domestic
cats have slit pupils. These slit pupils can focus
bright light without chromatic aberration, and are
needed since the domestic cat's pupils are much
larger, relative to their eyes, than the pupils
of the big cats... |
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