The reasons why cats have larger and smaller pupils:

1. The cat suffers from infectious peritonitis, accompanied by the growth of granulomatous tissue, which compresses the cat’s brain or central nervous system. , causing the cat’s pupils to become larger and smaller.

2. Cat brain tumors cause the tumor tissue to grow and become too large, causing the cat’s pupils to become larger and smaller.

3. There are tumors inside the cat’s eyes, which affect the cat’s pupil size adjustment.

4. Trauma to cats can also cause their pupils to become larger and smaller.

5. Cats inherit a gene that causes their eye pupils to be one large and one small when they are born.

If the cat’s eye pupils are larger and smaller and do not affect the cat’s normal life, the owner does not need to worry. However, if it affects normal life, the owner needs to take the cat to a regular ophthalmic pet hospital for examination and timely treatment.