When Does a Kitten's Eyes Change Colour? Complete Guide
When a cat gives birth, their kittens' eyes are a stunning blue upon first opening. This initial blue shade is not due to pigmentation but the way light refracts on their developing eyes. Over time, however, these eyes will often change colour, a fascinating process influenced by genetics and melanin production. This guide explains when and why kitten eye colour changes occur and what exceptions exist.
Understanding the Colours of Adult Cat Eyes
Adult cats exhibit a variety of eye colours including green, yellow, orange, gold, brown and blue, with many subtle shades in between. While breed plays a significant role in determining the final eye colour, the initial blue hue seen in kittens is due to refracted light, not pigment.
The pigmentation, caused by melanin produced by melanocytes in the iris, gradually develops as kittens grow. The depth and brightness of the eye’s colour depend largely on the amount of melanin present.
Why Are Kittens Born with Blue Eyes?
Kittens are born with undeveloped eyes; at birth, their sight is limited while senses of smell and touch are more advanced. Their eyes usually open between 7 and 16 days old, commonly around the second week. Initially, the eyes appear blue because there is minimal melanin and the eye structure causes light to scatter differently.
This blue eye colour gives way as melanin production starts, and kittens begin to see more clearly. Their vision and eye coordination continue to improve significantly between 4 and 7 weeks of age.
Timeline of Eye Colour Change in Kittens
The process of eye colour change typically begins between 3 and 8 weeks of age and is usually mostly complete by 12 to 16 weeks (3 to 4 months). Some kittens may begin showing their adult eye colour as early as 6 weeks, with the most pronounced changes around 7 weeks old.
It is important for kittens to develop proper vision before the eye colour settles. The final shade can be green, yellow, amber, brown, or other hues depending on genetics and breed.
Cat Breeds That Retain Blue Eyes
While many cats' eye colour will change, certain breeds keep their bright blue eyes throughout life because they produce little or no melanin in their irises. These include:
These breeds often have genetic traits that mask other pigments, leaving the blue eye colour dominant.
Permanent Eye Colour and Health Considerations
Once a cat reaches maturity, its eye colour typically remains the same. If you notice a change in eye colour in an adult cat, it might indicate health concerns such as infections or more serious conditions that require veterinary attention.
Early consultation with a vet is advisable if adult eye colour shifts occur to ensure your cat’s health is not at risk.
Key Takeaways
- Kittens are born with blue eyes due to undeveloped pigmentation and light refraction.
- Eye colour begins changing between 3 to 8 weeks and is usually settled by 12 to 16 weeks.
- Final eye colour depends on genetics, breed, and melanin development in the iris.
- Certain breeds retain blue eyes throughout life because of low melanin production.
- Any eye colour change in adult cats should prompt veterinary examination.
Providing attentive care and understanding your kitten's developmental milestones helps ensure their healthy growth and happiness.
