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Animals : cat eyesight, dynamic vision, field of vision

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How do cats usually see things? Cats have features that are different from humans, such as visibly narrowed pupils and glowing in the dark. Many people wonder if their eyes are clearly visible when they see a cat’s gestures and actions. In recent years, with the threatening advances in science and technology, we have come to understand how cats see things.

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eyesight

A cat’s visual acuity is said to be about 0.1 to 0.2, about 1/10 that of a human. The distance at which objects can be accurately identified is about 10m, and objects further away cannot be seen. Objects at rest appear hazy. The way a cat tilts its head is to change the angle to look at something.

red

The light that the human eye can perceive is red, green, and blue, which are called the “three primary colors of light.” We recognize various colors by combining these three colors. Of these three colors, cats cannot perceive “red” and can only perceive green and blue. The colors that cats can see are as follows.

  • gray or black
  • pink
  • brown
  • green

darkness

Cats can move lightly because their eyes glow even in the dark. It is located on the back of the cat’s retina in a thin membrane called the tapetum. Tapetum reflects the light that has passed through the retina like a mirror, increasing the light by about 40% and letting the retina feel it again. This reflex is what makes a cat’s eyes glow in the dark. In the dark, the pupil dilates as much as possible in an attempt to let in light. This is why cats have round eyes in the dark.

Dynamic visual acuity

Visual acuity (dynamic visual acuity), which recognizes moving objects and continuously distinguishes them without taking your eyes off the eye, is superior to that of humans. It can be said that cats have the ability to catch small animals and insects that move quickly while living in the wild. It is said that even a slight movement of 4 mm per second can be detected. It is because of this ability that they are able to catch and eat mice.

weakness

Cats are not good at it because their dynamic vision is too good. It is a “slow-moving object”. They are good at following fast things with their eyes, but are said to be very bad at things that move slowly. Because of their excellent dynamic vision, they sometimes misunderstand slow moving objects as “stopping”.

cat eye color

There are four main types of eye color in cats. Green, Hazel, Amber, Copper. Green is common in European cats. Hazel is a mixture of browns and greens and can be found in cats around the world. Amber is a strong yellow color unlike hazel. Coppers have brown eyes, which is common in East Asian cats.

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