By Dr Duncan Houston
A kitten whose littermates have started opening their eyes can look worryingly behind. A small difference in timing may be normal, but swollen lids or sticky discharge need a different response.
The useful distinction is whether the eyelids are gradually separating as the kitten develops or are being held shut by inflammation, pain or crust. Check the kitten's feeding and overall condition as well as their eyes.
Quick Answer
Most kittens open their eyes between 7 and 14 days after birth, although some start earlier. Let the lids separate naturally and never pull them apart yourself. If either eye remains closed at 14 days, contact your vet to arrange an examination. Swelling, discharge or an eye that closes again needs veterinary advice sooner, regardless of age.
What does normal eye opening look like?
Kittens are born with closed eyelids. Opening is gradual, so a narrow slit can appear before the whole eye becomes visible. The two eyes and different kittens in a litter do not necessarily progress together.
VCA's veterinary guidance on raising kittens gives the usual opening window as 7 to 14 days and recommends an examination if eyes remain closed at 14 days. Cats Protection's kitten development chart describes a broader window beginning at about five days. These are developmental guides, not deadlines that make every earlier or later kitten abnormal.
For a rescued kitten with an uncertain birth date, ask a vet to assess age using several features, including teeth, ears and movement. Eye opening alone cannot date a kitten accurately.
When can kittens see, and when does eye colour change?
Open eyelids do not mean mature vision. Over the following weeks, kittens become more coordinated and better able to explore. Around two to three weeks they begin standing and walking more confidently, but they still need a protected space without drops or other hazards.
Newly opened eyes usually look blue. Cats Protection notes that colour change may become noticeable around five weeks. Treat colour milestones as approximate. A blue iris, the coloured ring around the pupil, is different from a white or cloudy film over the front of the eye. Visible surface cloudiness needs prompt veterinary assessment.
Is this normal, or should you call a vet?
| What you notice | What it may mean | Action and timing |
|---|---|---|
| Eyes closed or partly open before two weeks; no swelling or discharge; kitten nurses well | Expected early development | Observe during routine care without manipulating the lids. |
| One or both eyes remain closed at 14 days | Delayed opening, uncertain age or an eyelid problem | Contact your vet to arrange an examination rather than waiting until three weeks. |
| Sticky discharge, redness or an eye that has opened and then becomes stuck shut | Inflammation or infection | Call your vet today for assessment. |
| Bulging closed lids, marked pain, surface cloudiness or a damaged-looking eye | Trapped infection or injury threatening the eye | Seek urgent veterinary care now. |
| Weakness, failure to feed or difficulty breathing | A potentially serious whole-body problem | Contact an emergency veterinary service immediately. |
Why might a kitten's eyes stay shut?
A comfortable kitten within the normal opening window may simply be developing. Once an eye has opened, however, persistent squinting or closing it again should not be dismissed as another developmental stage.
Infection can occur beneath unopened eyelids. This is called neonatal ophthalmia. Pus can collect behind the lids and damage the clear front surface of the eye. Veterinary Vision Center's explanation of neonatal eye infections describes the risks of corneal scarring, tissue adhesions and loss of vision if severe infection goes untreated.
After opening, conjunctivitis can cause redness, discharge and discomfort. Feline herpesvirus and bacterial infections are possible causes; dust, foreign material or an abnormal eyelid shape can also contribute. Appearance alone cannot identify the cause. The Merck Veterinary Manual's guidance on feline conjunctivitis explains why examination and sometimes further testing are needed.
A vet may need to carefully separate infected lids, flush away material and use an eye stain to check for ulcers. That treatment is different from an owner trying to speed up normal opening. Medication depends on the findings, and the mother or littermates may also need checking.
When is this an emergency?
Seek urgent care now for bulging lids, severe eye pain, an obvious injury, a collapsed-looking eye or rapidly worsening cloudiness. Do not wait for the expected eye-opening date. Call the clinic while preparing transport and explain that the kitten is a newborn.
A kitten that is limp, struggling to breathe or unable to feed also needs immediate veterinary attention, even if their eyes look normal. Cats Protection's hand-rearing guidance warns that kittens refusing feeds can deteriorate rapidly. Keep the kitten gently warm during transport and follow the clinic's instructions.
What should you do next?
- Record what has changed. Note the birth date if known, which eye is affected, whether it ever opened, and any discharge or swelling. A clear photograph can help document progression for the vet.
- Check the whole kitten. Watch nursing, activity and comfort during regular checks. Record weight daily on a suitable scale; weight loss or failure to gain needs veterinary advice.
- Leave healthy eyelids alone. If discharge is present, call your vet. If advised, gently soften external crust with a clean cloth dampened with warm water, using a fresh piece for each eye and kitten. Do not rub, press on the eyeball or pry the lids apart.
- Follow treatment and recheck instructions. Cleaning cannot treat an infection under closed lids. Contact the vet promptly if signs worsen or another kitten develops symptoms.
Common mistakes to avoid
- Waiting until 21 days despite unopened eyes, swelling or discharge.
- Using human eye drops, leftover medication or home remedies without veterinary instructions.
- Assuming a cloudy eye surface is simply normal blue kitten eye colour.
- Repeatedly disturbing the nest to compare kittens or test their sight.
How can you support healthy development?
Keep bedding clean and dry, wash your hands before handling the litter, and keep unrelated cats away. Provide a quiet, comfortably warm nest and support the mother's care. Cats Protection's postnatal care advice explains how to balance observation with giving the mother space.
If the mother cannot feed or care for the kittens, obtain a veterinary hand-rearing plan promptly. Eye opening does not mean they can manage without milk, warmth or help toileting.
As healthy kittens become more active, offer safe floor-level exploration and brief, gentle handling. Introduce ordinary experiences gradually without frightening the mother or litter. Cats Protection's socialisation guidance identifies the early weeks as an important time for positive learning. Arrange routine veterinary care appropriate to their age and circumstances.
Frequently Asked Questions
Is it normal for a kitten to open only one eye?
The eyes may open at slightly different times. Monitor a comfortable kitten within the usual age window, but contact your vet for discharge, swelling or an eye still closed at 14 days.
Can I help my kitten open their eyes?
Do not pull or force healthy eyelids apart. If infection is suspected, a vet may need to open them as part of treatment.
Why are my kitten's eyes blue?
Blue is usual when eyes first open, and colour may start changing over the following weeks. A cloudy layer over the eye surface is a separate concern that needs assessment.
Can kittens eat solid food when their eyes open?
Eye opening happens before normal weaning. Kittens generally begin trying suitable solid kitten food around three to four weeks while milk feeding continues. Ask your vet for a plan if you are hand-rearing.
Most kittens reach this milestone without help. Let comfortable, healthy eyes open naturally, arrange a check if they remain closed at two weeks, and act sooner for swelling, discharge or illness.
If you need help understanding your kitten's development or preparing questions for your vet, ASK A VET™ offers a supportive place to start. Urgent eye changes need an in-person veterinary examination.
The ASK A VET™ Tracker logs live location and activity trends, so a change in routine never goes unnoticed.
Every ASK A VET article is written and reviewed by qualified veterinarians.
