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How can cats see well in very low light?
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cat
Two kinds of domestic cats.
Domestic cats are highly efficient at navigating in low-light environments due to several specialized anatomical adaptations. Because they are crepuscular—meaning they are most active at dawn and dusk—they require only one-sixth of the illumination levels that humans need to see well.1
Their ability to see in dim light is supported by the following mechanisms:
- Tapetum Lucidum: Contrary to the belief that their eyes glow, cats possess a layer of cells behind the retina called the tapetum lucidum. This layer reflects light back through the eye, allowing the cat to utilize ambient light with high efficiency.1
- Pupillary Control: Cats have vertical slit pupils that provide precise control over the amount of light entering the eye. In low-light conditions, these pupils can expand significantly to capture as much light as possible, which is essential for hunting and navigation.2
These features allow cats to maintain optimal vision while protecting their sensitive eyes from damage during brighter conditions, when the pupils constrict to limit light intake.2