These illustrations show some of the special features of a cat's eyes.
Cats can see well in normal and dim light.
Narrowing of the pupils in bright light allows less light into the eyes. Widening of the pupils in dim light permits more light to enter the eyes. A third eyelid, in the inner corner of each eye, protects and lubricates the eyes. Irises of different colors are a feature of odd-eyed cats. The cats have normal vision.