One blue and one yellow eye in a cat is usually determined by genes, and a few are caused by acquired lesions. This condition is generally called heterocoria or mandarin duck eyes. If it is determined by genes, then this abnormality will not affect the cat's vision, but it may affect the cat's hearing. Cats with such eyes may suffer from hearing loss in one or both ears in middle age and old age. If it is caused by acquired lesions, it is best for the owner to take the cat to the pet hospital for examination in time, and then treat it after the diagnosis is confirmed.

1. Genetic determination

Congenital anisocoria is caused by the all-white or white-white gene. If the white-white gene happens to invade the position of the eye pigment gene, blue eyes will be formed. Eyes, if the other eye is not affected, it will be a yellow eye. For example, Persian cats and white-haired cats often have ectopia. Although this abnormality has no impact on the cat's health and hearing, cats with heterocoria usually have hearing impairment.

2. Caused by acquired lesions

If the cat’s eye color was the same before, it may be that the formation of iris pigment cells in the eye has been affected by illness, injury, etc., thus changing the color. The original color of the eyes. If this is the case, it is best for the pet owner to take the cat to the pet hospital for examination in time to find out what is the specific cause, and then carry out targeted treatment.

Note: About 75% of cats with heterocoria cannot hear sound in the ear on the blue eye side, but blue eyes and ears caused by key colors are normal. For example, gold dot, silver dot and other cats.