Around 2-3 months old. Normally kittens open their eyes around 7-14 days after birth. When the kitten opens its eyes, there is a layer of blue-gray membrane on the eyes, so the eye color is blue-gray. When the kitten grows to 2-3 months old, the blue film gradually fades, and then the kitten's true eye color will appear. The hetero-eyed lion cat is a very mysterious and peculiar cat breed. It has two different colored pupils, which is very rare and interesting.