Yellow and green are two common cat eye colors, and they are usually caused by different distribution and concentration of pigments in the retinal cells. When the yellow and green pigments are cleverly distributed in the cat's eyes, it creates a beautiful sight of yellow on the outside and green on the inside.

In addition to being beautiful, this color combination may also hint at the cat's health. Some studies have shown that there is a correlation between a cat's eye color and its genetic background and health. For example, certain breeds of cats are naturally prone to a combination of yellow and green eyes. Additionally, a cat's medical condition may also affect the color of its eyes. For example, some eye diseases or infections can cause changes in eye color.