What Is Photokeratitis? Understanding Snow Blindness and Sun-Related Eye Damage

By Dr. Michael A. Campbell. O.D., O.D. | Dec 11, 2025

Most people know that UV rays can burn the skin, but far fewer realize that your eyes can get sunburned, too. This painful condition, often referred to as snow blindness, especially in winter or reflective environments, is called photokeratitis, and it can strike even on cool or cloudy days. Whether you’re boating on the May River, spending time on Hilton Head’s beaches, golfing in the winter sun, or heading out on a ski trip, your eyes may be at risk without the right protection.

At Optical Solutions, we recognize how easily photokeratitis can occur, especially in coastal areas where water, sand, and bright skies reflect UV light into the eyes. The good news is that it’s preventable and treatable when you know the signs and take the right steps.

This guide covers everything you need to know: what is photokeratitis, why it happens, how to treat it safely, and how to protect your vision year-round.

What Is Photokeratitis?

Photokeratitis is a temporary but painful inflammation of the cornea caused by overexposure to UV radiation. Think of it as a sunburn on the surface of your eye.

The cornea, the clear, dome-shaped front layer of your eye, is extremely sensitive. When UV radiation overwhelms its natural defenses, cells on the surface are damaged or shed. This causes irritation, pain, and temporary vision problems.

Photokeratitis is often called:

• Snow blindness (when caused by snow/ice reflections)
  
• UV keratitis
  
• Arc eye (common in welders)
  
• Sailor’s eye or surfer’s eye in coastal regions
  

Though names differ, the root cause is the same: too much UV light hitting the eye in a short period of time.

Why does it happen more often than people think

Unlike skin, the eye doesn’t become red immediately after UV exposure, so most people don’t realize damage is occurring until hours later. That’s why symptoms often appear 30 minutes to 12 hours after exposure.

Even in cooler winter temperatures, late fall, and early spring, UV levels can be strong. The Lowcountry’s bright winter days, reflective waterways, and light-colored sand make UV exposure a year-round concern.

What Causes Photokeratitis?

Understanding the common causes can help you avoid situations that increase UV exposure.

1. Direct UV Exposure from Sunlight

The sun emits UVA and UVB rays. Both can damage the eye, but UVB rays are primarily responsible for photokeratitis. Risk increases during:

• Outdoor sports
  
• Midday sun exposure
  
• Driving without UV-protective lenses
  
• Windy days (wind worsens dryness, making the eye more vulnerable)
  

Even on cloudy days, up to 80% of UV rays still pass through clouds, surprising many patients who assume cloud cover is protective.

2. Reflected UV Light: Snow, Water, and Sand

Reflected UV is often more dangerous than direct sunlight because it enters the eye from below and from multiple angles.

Snow Reflection (Snow Blindness)

Snow can reflect up to 80% of UV radiation, effectively doubling exposure by hitting the eyes from above and below.

Although the Lowcountry rarely sees snow, many residents travel to ski resorts during the winter, making this a common source of photokeratitis.

Water Reflection

Here in Bluffton and Hilton Head, water glare is a major cause. UV rays bounce off:

• Oceans
  
• Rivers
  
• Marshes
  
• Pools
  
• Wet sand
  

So even on a cool winter boat ride, UV exposure can be intense enough to cause eye sunburn.

Sand, Concrete & Roadways

Light-colored ground surfaces can reflect UV as well. This includes:

• White sand beaches
  
• Concrete sidewalks
  
• Parking lots
  
• Golf courses
  

Winter sun sits lower on the horizon, meaning sunlight and reflected glare can strike the eyes more directly during morning and afternoon hours.

3. Artificial UV Sources

Some man-made sources can cause photokeratitis very quickly:

• Welding arcs (arc eye is common among welders without proper protection)
  
• Tanning beds
  
• UV-curing lamps
  
• Indoor sports stadium lighting
  

While less common than sunlight exposure, these sources can cause intense, short-burst UV radiation.

Understanding Snow Blindness

“Snow blindness” is the best-known form of photokeratitis. It happens when intense UV rays reflect off snow and ice, overwhelming the cornea’s defense mechanisms.

Key characteristics:

• High-altitude skiing increases UV exposure by 10% for every 1,000 feet gained
  
• Snow reflects more UV than water or sand
  
• Symptoms often hit travelers in the evening after a day outdoors
  
• Goggles with full UV protection are essential
  

Even if you don’t live in snowy environments, the same effect happens on bright beaches and open water, something coastal residents must be aware of year-round.

Symptoms of Photokeratitis

Symptoms typically show up within 30 minutes to 12 hours after exposure. They often resemble a combination of severe dry eye and abrasion.

Common symptoms include:

• Pain or burning in the eyes
  
• Blurry or hazy vision
  
• Light sensitivity (photophobia)
  
• Red, irritated eyes
  
• Excessive tearing/watery eyes
  
• Gritty or sandy sensation
  
• Headache around the eye area
  
• Eyelid twitching or swelling
  
• Temporary vision changes
  

Some patients describe it as feeling like “glass in the eye” or “a handful of sand under the eyelid.”

How long do symptoms last?

Most cases improve within 24–72 hours, but the first 12–24 hours can be uncomfortable.

Warning signs that need immediate care:

• Severe pain
  
• Vision loss
  
• Symptoms not improving after 24 hours
  
• Symptoms in a child (children should always be evaluated)
  
• Pain after welding or exposure to intense UV sources
  

How Photokeratitis Is Diagnosed at Optical Solutions

When you visit Optical Solutions for suspected photokeratitis, Dr. Michael Campbell will perform several checks to ensure you’re diagnosed correctly and rule out other possible issues.

Typical exam includes:

1. Slit-Lamp Examination

A specialized microscope that allows Dr. Campbell to evaluate:

• Corneal surface health
  
• Presence of abrasions
  
• Signs of inflammation
  
• Damage patterns typical of UV injury
  

2. Fluorescein Dye Test

An eye-safe dye highlights injured areas of the cornea so the doctor can see the extent of damage clearly.

3. Rule-Out of Other Conditions

Symptoms of photokeratitis can mimic:

• Dry eye flare-ups
  
• Corneal scratches
  
• Allergic reactions
  
• Viral eye infections
  

A proper exam ensures correct treatment.

4. Evaluation for Children & Contact Lens Wearers

Children and lens wearers are more prone to complications and may require closer follow-up.

Treatment for Photokeratitis

Most cases resolve naturally, but proper care can significantly reduce discomfort and speed healing.

At-Home Relief

1. Rest Your Eyes

Stay in a dark, quiet room to avoid overstimulation. Bright light can make symptoms worse.

2. Apply Cool Compresses

Use a clean, cool, damp cloth. This helps reduce:

• Swelling
• Burning
  
• Light sensitivity
  

3. Use Preservative-Free Artificial Tears

Lubricating drops soothe irritation and help the cornea heal.

4. Avoid Contact Lenses

Contacts can irritate the damaged cornea and slow healing.

5. Avoid Eye Rubbing

Rubbing can worsen inflammation and introduce bacteria.

6. Wear Sunglasses Indoors if Needed

Helps reduce discomfort from indoor lighting.

Professional Treatment at Optical Solutions

If symptoms are moderate to severe, or if you’re unsure of the cause, Dr. Campbell may recommend:

• Prescription anti-inflammatory drops
  
• Medicated lubricating drops
  
• Temporary bandage contact lenses (only in specific cases)
  
• Pain management strategies
  
• Follow-up visits to monitor healing
  

Children often need quicker evaluation because they may not articulate their symptoms clearly, and their eyes absorb more UV light.

Healing Timeline

• 12–24 hours: Initial pain and tearing
  
• 24–48 hours: Symptoms begin improving significantly
  
• 48–72 hours: Corneal cells regenerate, vision returns to normal
  

Persistent pain beyond 3 days is uncommon and warrants re-evaluation.

How to Prevent Photokeratitis – Especially in Winter

Prevention is simple, highly effective, and essential for long-term eye health. If you’ve ever wondered how to treat and prevent photokeratitis during winter, the key is combining proper eyewear, smart outdoor habits, and regular eye protection, even on cloudy or cold days.

1. Wear UV400 Sunglasses

This is the most important step.

Look for sunglasses labeled:

• UV400
  
• 100% UVA/UVB protection
  

Polarized lenses help with glare, but polarization does not equal UV protection; both features are ideal.

Why wrap-around styles help:

• Block UV from the sides
  
• Reduce glare from water and sand
  
• Provide full coverage for boating, beach trips, or golf
  

2. Use Proper Eyewear for Winter Sports

If you travel to snowy areas:

• Wear ski goggles with full UV protection
  
• Choose mirrored or polarized lenses
  
• Ensure goggles fit snugly and block peripheral light
  

Even in overcast weather, UV radiation remains strong at high altitude.

3. Take Extra Care for Children

Children are at higher risk because:

• Their lenses are clearer, allowing more UV to reach the retina
  
• They spend more time outdoors
  
• They may not communicate discomfort
  

Protective steps:

• Child-sized UV400 sunglasses
  
• Hats with brims
  
• Sports goggles for outdoor play
  

If your child complains of burning or gritty eyes after outdoor exposure, schedule an exam.

4. Protect Your Eyes During Water Activities

Even in winter:

• Wear sunglasses while boating or fishing
  
• Use polarized lenses to reduce water glare
  
• Wear hats to block the overhead sun
  
• Reapply sunblock around the eyes (but avoid getting it in the eye)
  

5. Don’t Be Fooled by Clouds

Clouds block visible light but not UV light.
Reflected UV from snow, sand, and water still reaches your eyes even on gray days.

6. Keep Sunglasses in Your Car

Driving exposes your eyes to:

• Low-angle winter sun
  
• Glare from windshields
  
• Strong reflections from the road
  

Wearing UV-blocking lenses while driving can prevent long-term exposure.

7. Replace Old or Scratched Sunglasses

Scratches reduce UV protection and can distort vision.
Replacing aging eyewear helps maintain protection.

Long-Term Effects of Repeated UV Exposure

Even though photokeratitis itself is temporary, repeated UV damage can cause serious long-term eye conditions, including:

1. Cataracts

UV exposure is a major risk factor for early cataract development.

2. Pterygium (“Surfer’s Eye”)

A growth on the white part of the eye that can extend onto the cornea.

3. Chronic Dry Eye

UV exposure can worsen ocular surface inflammation.

4. Macular Degeneration

UV radiation may contribute to age-related retinal damage.

5. Skin Cancer Around the Eyes

The eyelids and surrounding skin are extremely vulnerable.

Protecting your eyes today helps safeguard vision for decades to come.

When to See an Eye Doctor

You should schedule an appointment if:

• You have severe pain
  
• Vision is blurry or reduced
  
• Symptoms last longer than 24–48 hours
  
• Symptoms appear after a day on the water
  
• Your child is experiencing eye discomfort
  
• You suspect welding-related UV exposure
  

At Optical Solutions, we provide same-day and next-day visits for urgent ocular issues.

Protect Your Eyes With Optical Solutions in Bluffton & Hilton Head

Optical Solutions offers comprehensive care to keep your eyes healthy year-round, including:

• Comprehensive Eye Exams
• Pediatric Eye Care
• Dry Eye Diagnosis & Treatment
• Sunglasses & Prescription UV-Protective Eyewear
  
• Contact Lens Fittings
  
• Optical Lab Services for Custom Lenses
  

Dr. Campbell and our team can help you choose high-quality sunglasses, prescription lenses, and protective eye gear tailored to your lifestyle, whether you’re on the beach, boating, golfing, or traveling to snowy conditions.

Protect your eyes today. Schedule an appointment with Optical Solutions and keep your vision safe all year long.

FAQs

1. Can photokeratitis happen without snow?
   Yes, water, sand, and even concrete can reflect enough UV light to cause corneal sunburn.
2. Is snow blindness permanent?
   No, it’s temporary, but repeated UV exposure can cause long-term eye issues.
3. How long does photokeratitis last?
   Most cases resolve within 24–72 hours.
4. Are polarized lenses enough?
   No. Polarization reduces glare, but you also need UV400 protection to block harmful UV rays.
5. Can children get photokeratitis?
   Absolutely, in fact, they are more vulnerable. Always ensure your child wears UV-protective eyewear outdoors.