Kittens are born with their eyes closed, and they typically begin to open their eyes when they are around 7 to 10 days old. However, this can vary depending on the individual kitten and the breed. Some kittens may open their eyes as early as 3 to 4 days old, while others may take up to 2 weeks to open their eyes.
At first, the kitten's eyes will only be partially open, and they may appear blue or gray in color. As the kitten grows, their eyes will continue to develop and their true eye color will become more apparent. By the time they are 2 to 3 weeks old, their eyes should be fully open and they will be able to see more clearly.
It's important to note that if a kitten's eyes do not open within the first 2 weeks of life, or if there is discharge or swelling around the eyes, it may be a sign of an infection or other health issue, and a veterinarian should be consulted.