Is it bad if a kitten's eyes open early or late?

A little variation either side of the typical seven to fourteen day window is normal, and it can differ between kittens in the same litter. It only becomes a concern if the eyes have not opened at all by around two weeks, or if one eye looks swollen, red or is producing heavy discharge rather than gradually opening.

Should I help a kitten's eyes open?

No, do not try to prise a kitten's eyes open yourself. They open in their own time as the eye finishes developing underneath, and forcing them open risks damaging a delicate structure that is not ready yet. If they have not opened by around two weeks, that is a reason to contact a vet, not to intervene at home.

Why are newborn kittens' eyes blue?

Almost all kittens are born with blue-grey eyes regardless of what colour they will end up as an adult. The true eye colour develops gradually over the following weeks and is usually settled by around six to eight weeks old.

When can kittens see properly?

Vision is blurry for a while after the eyes first open and sharpens gradually over the following few weeks. By around four to five weeks old, most kittens have reasonably functional eyesight, though full visual development continues a little beyond that.

When do kittens open their eyes?

Most kittens begin opening their eyes somewhere between seven and fourteen days old, with both eyes usually fully open by around two weeks. It happens gradually rather than all at once, often starting as a narrow slit that widens over a few days, and it is one of several milestones that follow a fairly predictable order in early kitten development.

What happens, and roughly when

Kittens are born with their eyes completely closed, and the eyelids stay sealed for the first week or so of life while the eyes finish developing underneath. Opening usually starts around day seven to ten, though it is entirely normal for it to happen a little earlier or later, and for one eye to open slightly ahead of the other.

Once open, a kitten's eyes are typically a cloudy blue-grey colour to begin with, and their true adult eye colour does not settle until several weeks later. Vision itself takes a little longer to develop fully after the eyes open — a newborn kitten's eyesight is blurry at first and sharpens gradually over the following weeks.

What is normal, and what is not

Some discharge or a little crustiness around the eyes as they open is common and usually resolves on its own as the eye finishes developing. It is not something to force open or clean aggressively — let the process happen at its own pace.

Ring your vet if a kitten's eyes have not started opening by around two weeks old, if there is heavy discharge, swelling, or the eye looks red or closed shut rather than gradually opening, or if only one eye seems affected while the kitten seems otherwise unwell. Eye infections in very young kittens can develop quickly and are worth having checked properly rather than waiting to see.

What else is happening around the same age

Eyes opening tends to coincide roughly with kittens starting to become more mobile — wobbly crawling gives way to more purposeful movement over the following couple of weeks, and hearing develops at a broadly similar stage. None of these milestones happens on an exact schedule, and a healthy litter can show a spread of a few days between siblings.

By around three to four weeks, most kittens are walking more confidently, starting to play with littermates, and beginning the move towards solid food alongside their mother's milk. The opening of the eyes is one of the more visible early markers that development is on track, which is part of why it gets asked about so often.

Common questions

Is it bad if a kitten's eyes open early or late?: A little variation either side of the typical seven to fourteen day window is normal, and it can differ between kittens in the same litter. It only becomes a concern if the eyes have not opened at all by around two weeks, or if one eye looks swollen, red or is producing heavy discharge rather than gradually opening.
Should I help a kitten's eyes open?: No, do not try to prise a kitten's eyes open yourself. They open in their own time as the eye finishes developing underneath, and forcing them open risks damaging a delicate structure that is not ready yet. If they have not opened by around two weeks, that is a reason to contact a vet, not to intervene at home.
Why are newborn kittens' eyes blue?: Almost all kittens are born with blue-grey eyes regardless of what colour they will end up as an adult. The true eye colour develops gradually over the following weeks and is usually settled by around six to eight weeks old.
When can kittens see properly?: Vision is blurry for a while after the eyes first open and sharpens gradually over the following few weeks. By around four to five weeks old, most kittens have reasonably functional eyesight, though full visual development continues a little beyond that.

Sources

Written against guidance published by UK veterinary and welfare organisations. Always confirm specifics with your own vet.

Written by Matt Garnett, who runs Giddy Pets and is a lifelong pet owner — not a vet. This is general information, not veterinary advice, and it cannot replace an examination by the vet who knows your animal. How we write these guides.