Cat Eye Color Change

A cat eye color change will take place at about 7-9 weeks of age in the life of a kitten. Until then the eye color is created by light refraction. Thereafter the formation of pigment in the iris of the cat's eyes creates the color. The change in eye color is due to a delayed creation of pigmentation in the iris of the young cat.

Below are pictures which show (a) the difference between the iris and pupil and (b) why kittens without pigmentation in the pupil always have blue eyes:

Blue Cat Eyes

These images illustrate this page which explains things.

Blue Cat Eyes

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