Cloudy Eye: Why the Eye Looks Milky or Vision Looks Hazy

Where the cloudiness is

The eye has several clear structures that light must pass through. Where the haze sits largely decides the cause:

• Cornea: the clear dome at the front. Cloudiness here is visible to others as a gray or white haze over the colored iris. It often comes with pain if inflamed.
• Lens: sits behind the pupil. A dense cataract makes the pupil look gray or milky instead of black.
• Inside the eye: inflammation or bleeding in the fluid can make vision foggy without the eye looking cloudy from outside.

Common causes of a cloudy eye

Cataract

A cataract is clouding of the lens. It is the leading cause of cloudy vision in adults over 60 and develops slowly. People notice:

• foggy or dim vision, as if looking through a smeared windshield
• glare and halos around headlights at night
• colors looking faded or yellowed
• frequent changes in glasses prescription
• a gray or milky pupil only once the cataract is advanced

Diabetes, smoking, long-term steroid use, eye injury and lots of sun exposure make cataracts form earlier.

Corneal swelling (edema)

The cornea stays clear by pumping fluid out. When that pump fails, the cornea swells and turns hazy. The commonest cause is Fuchs' dystrophy, an inherited condition that usually appears after 50. Vision is typically worst on waking and clears during the day as fluid evaporates. Corneal edema can also follow cataract surgery or very high eye pressure.

Corneal scarring

Old infections, injuries or inflammation can leave a permanent white scar on the cornea. Corneal scarring blurs vision if it lies over the pupil.

Arcus senilis

A gray, white or blue ring around the edge of the cornea is a fatty deposit. In people over 60 it is a normal aging change. Under 45 it can be a sign of high cholesterol and is worth a blood test. It does not affect vision.

Urgent causes of a cloudy eye

Corneal ulcer and keratitis

Keratitis is inflammation of the cornea, often from infection. A corneal ulcer is an open sore on the cornea. Signs are a red, painful eye, a white or gray spot, discharge, light sensitivity and blurred vision. Contact lens wearers are at highest risk, especially those who sleep or swim in lenses. Bacteria, herpes viruses, fungi and Acanthamoeba can all cause it. It can scar the cornea within days without treatment.

Acute angle-closure glaucoma

In acute glaucoma the drainage angle of the eye suddenly blocks and pressure rises sharply. The cornea swells and looks steamy. There is severe eye pain, headache, nausea, vomiting, halos around lights and a fixed, mid-sized pupil. Permanent vision loss can occur within hours.

Uveitis

Uveitis is inflammation inside the eye. Cells floating in the eye fluid make vision hazy, with a red, aching eye and light sensitivity. It is linked to autoimmune diseases such as ankylosing spondylitis.

Chemical injury

Alkali chemicals (oven cleaner, drain cleaner, lime, cement) can whiten the cornea within minutes. Immediate, prolonged rinsing saves sight.

Cloudy eye in babies and children

A cloudy eye in a child is never normal:

• Congenital cataract: a white or gray pupil, or a missing red reflex in photos. Early surgery is needed to prevent permanent amblyopia (lazy eye).
• Congenital glaucoma: a large, hazy cornea with tearing, light sensitivity and eyelid squeezing.
• Retinoblastoma: a rare eye cancer that causes a white pupil (leukocoria), often noticed in flash photos.
• Birth trauma or infection: corneal clouding at birth.

Cloudy eye causes compared

How doctors diagnose a cloudy eye

An eye doctor will check your vision on a chart, then use a slit lamp, a microscope with a bright light, to look at each layer of the eye. They may:

• put in orange fluorescein dye to show ulcers and scratches
• measure eye pressure
• dilate the pupil to examine the lens and retina
• measure corneal thickness (pachymetry) for Fuchs' dystrophy
• take a scraping or swab of an ulcer to identify the germ

Treatment for a cloudy eye

• Cataract: surgery replaces the cloudy lens with a clear artificial lens. It is one of the most common and successful operations, usually done under local anesthetic as a day procedure. It is offered when the cataract affects daily life, such as reading or driving.
• Corneal ulcer or keratitis: frequent antibiotic, antifungal or antiviral drops, sometimes every hour at first. Stop wearing contact lenses.
• Acute glaucoma: drops and medicines to lower pressure quickly, then laser treatment (iridotomy) to create a new drainage path.
• Uveitis: steroid drops and drops that dilate the pupil.
• Fuchs' dystrophy: salt-based (hypertonic) drops for mild cases. A partial corneal transplant replaces the inner layer when vision is poor.
• Corneal scars: specialist contact lenses, laser or a corneal transplant.

Protecting your eyes

• Never sleep, shower or swim in contact lenses, and replace cases often.
• Wear safety glasses for DIY, gardening with power tools and chemical work.
• Wear UV-blocking sunglasses and do not smoke.
• Have regular eye exams, at least every 1 to 2 years after 65, and yearly if you have diabetes.

Frequently asked questions

What causes a cloudy eye?

The most common cause in adults is a cataract, a gradual clouding of the lens. Other causes include corneal swelling from Fuchs' dystrophy, corneal scars, infections such as keratitis or a corneal ulcer, inflammation inside the eye (uveitis) and a sudden rise in eye pressure (acute glaucoma).

Is a cloudy eye an emergency?

It can be. Get same-day care if cloudiness starts suddenly or comes with pain, redness, light sensitivity, halos, headache or vomiting, or after an injury or chemical splash. A slowly cloudy eye without pain is usually a cataract and needs a routine eye appointment.

Can a cloudy eye go away on its own?

Cataracts do not go away, but surgery cures them. Haze from mild corneal swelling or inflammation can clear with treatment. Infections need prompt drops to prevent permanent scarring. Morning cloudiness from Fuchs' dystrophy improves through the day but the condition slowly progresses.

What does a white cloudy spot on the eye mean?

A white spot on the cornea with pain and redness may be a corneal ulcer and needs urgent care. A painless white spot may be an old scar. A white or yellow raised bump on the white of the eye is often a pinguecula, which is harmless.

Why does my baby's eye look cloudy?

A cloudy cornea or white pupil in a baby can be a congenital cataract, congenital glaucoma or, rarely, retinoblastoma. All need prompt assessment by a pediatric eye specialist, because early treatment protects vision and, with retinoblastoma, life.