By Dial A Vet Veterinary Team
A cloudy eye can mean very different things in a dog. A soft blue haze in an older dog is often a normal ageing change that barely affects sight. A cloudy eye that appeared overnight with squinting and tears can be glaucoma or a corneal ulcer, where hours matter. The quickest way to sort one from the other is to look at where the cloudiness sits, how fast it came on, and whether the eye is sore.
Key takeaways
- Cloudiness can sit on the surface of the eye (the cornea) or deeper inside (the lens).
- Nuclear sclerosis is a normal grey-blue haze in older dogs and does not need treatment.
- Cataracts are whiter and interfere with vision.
- A painful, red or squinting cloudy eye is a same-day problem.
- A sudden blue eye that looks larger than the other can be glaucoma, which is an emergency.
Where is the cloudiness?
On the surface: the cornea
The cornea is the clear front window of the eye. When it is damaged or swollen it turns hazy, blue or white.
- Corneal ulcer: a scratch or erosion, often from a cat scratch, a grass seed or rubbing. Usually painful with squinting and tears.
- Corneal oedema: fluid in the cornea gives a blue, steamy look. It can follow an ulcer, glaucoma, inflammation or ageing of the cells lining the cornea.
- Corneal dystrophy or lipid deposits: white or silvery crystals, usually in a comfortable eye.
- Pigment or scarring: brown or white patches, sometimes from long-standing dry eye or pannus in German Shepherds.
Deeper in: the lens
- Nuclear sclerosis: from around seven years, the lens centre hardens and looks grey-blue, especially in photos. Vision is usually fine.
- Cataract: a white or patchy opacity that blocks light. Can be inherited, linked to diabetes or age. See cataracts in dogs.
- Lens luxation: the lens slips out of place, sometimes leaving a crescent at the edge of the pupil. Terrier breeds are prone. This is an emergency.
Inside the eye
- Uveitis: inflammation inside the eye can make it look hazy or the iris look muddy. Often red and painful.
- Glaucoma: raised pressure causes a blue, cloudy cornea, a dilated pupil and a red eye. Dogs may seem dull or hide from pain rather than cry out.
Signs that help sort it out
- Comfortable dog, slow change over months, both eyes similar: often nuclear sclerosis or an early cataract.
- Squinting, tears, pawing at the eye: points to the cornea or inside the eye.
- Red whites of the eye: inflammation, ulcer or glaucoma.
- One eye bigger, bluer or harder looking: glaucoma until proven otherwise.
- Bumping into things: vision is affected, whatever the cause.
When to see a vet
Emergency, same day or tonight: sudden cloudiness, a painful or squinting eye, an eye held shut, a red eye with a cloudy cornea, an enlarged eye, sudden blindness, or any injury to the eye. Our page on glaucoma in dogs explains why this cannot wait.
Within a few days: a new cloudy patch in a dog that seems comfortable, or a diabetic dog whose eyes are changing.
At the next check-up: a slow, even blue haze in an older dog who sees well.
How vets work it out
Your vet will look at the eye with bright light and magnification, in a dim room where possible. Common tests include:
- Fluorescein stain, a green dye that sticks to ulcers
- Eye pressure measurement to check for glaucoma
- A tear test if the eye looks dry
- Dilating the pupil to examine the lens and retina
Treatment depends on the cause. Ulcers often need medicated drops and protection from rubbing. Glaucoma needs fast pressure-lowering treatment and sometimes surgery. Uveitis treatment targets inflammation and any underlying disease. Cataracts may be referred to a veterinary ophthalmologist. Nuclear sclerosis needs no treatment at all.
What not to do
- Do not use leftover eye drops at home. Drops containing steroids can make an ulcer much worse.
- Do not use human eye products unless your vet approves them.
- Prevent rubbing with a soft cone if your dog is pawing at the eye on the way to the clinic.
FAQ
Can dogs still see with cloudy eyes?
Dogs with nuclear sclerosis usually see well. Cataracts and corneal disease can reduce vision, depending on how dense they are.
Is cloudy eye in a puppy normal?
Puppies' eyes are slightly hazy for a short time after opening. Persistent cloudiness should be checked, because some cataracts and eye defects are present from birth.
Why does my dog's eye look blue in photos only?
Camera flash often highlights nuclear sclerosis. If the eye looks normal in daylight and your dog sees well, mention it at the next visit.
Can a cloudy eye clear on its own?
Mild corneal oedema can settle once the cause is treated. Cataracts and nuclear sclerosis do not reverse.
Talk with a vet
If you are not sure whether your dog's cloudy eye can wait, a Dial A Vet veterinarian can help you decide how quickly to be seen. Speak with a Dial A Vet vet. A painful, enlarged or suddenly cloudy eye needs an emergency clinic now.
References
- Merck Veterinary Manual: Ophthalmology in dogs, cornea and lens disorders
- American College of Veterinary Ophthalmologists (ACVO): Owner resources on cataracts and glaucoma
- Maggs DJ, Miller PE, Ofri R. Slatter's Fundamentals of Veterinary Ophthalmology, 6th edition
- Cornell University College of Veterinary Medicine: Canine eye health
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If you are worried about your pet right now, contact your local vet or nearest emergency animal hospital.
