A cat's eyes change three times a day: in the morning they look like date stones, at noon they turn into a line, and at night they look like a full moon. The reason for this phenomenon is that cats’ pupils are large and change with the intensity of light. In addition, their pupils have "sphincter muscles" that are extremely capable of contracting and can shrink from a full circle to a line. The stronger the light, the narrower the cat's pupils will be; the weaker the light, the rounder the pupils will be. In the morning, the sunlight intensity is average, and the cat's eyes take on the shape of date pits. At noon, the sun was strong, and the cat's pupils shrank into a line. At night, when the light is weak, the cat’s eyes become rounder.

In addition, the cat’s mood will also affect the size of the pupil. When the cat is relaxed and bored, the pupil will shrink into a line or an oblate shape; when the cat is in a state of excitement or fear, the pupil will shrink. It will expand into a circle.

Cat eye color:

1. Cat’s eyes come in various colors such as blue, green, yellow, brown, etc. These colors are mainly determined by the iris, and There is a transitional relationship between colors, with no clear boundaries. The iris is the colored part around the pupil. This part is mainly composed of sphincter muscles, which controls the amount of light passing through like the aperture of a camera.

2. The cat's iris is divided into two layers. The outer layer is the matrix with loosely arranged cells, and the lower layer is epithelial tissue with tightly arranged cells. Both layers contain pigment-producing cells, although the numbers vary.

The color of the iris is determined by these pigment cells. Different cell numbers and activities determine the color differences of the cat's iris. If there are no pigment cells, the cat's eyes will look blue; if there are fewer pigment cells, the cat's eyes will appear green; if there are more pigment cells, the cat's eyes will appear yellow or brown.