Blinded By The Light

Ultraviolet keratitis/ keratopathy

Other names for this condition are solar keratitis, photokeratitis, welder’s flash, arc eye, bake eyes, and snow blindness.

Anyone exposed to excess UV radiation:

• welders
• sunbed users
• people in high altitude environments
  (UV levels increase by about 4% for every 1000 feet/ 305 m)
• people exposed to sunlight reflection from:
  water (sea foam reflects about 25% of UV, sandy beaches about 15%) or
  snow (fresh snow reflects about 80% of UV)

History:

• Patient at risk? (see Q2) — symptoms typically emerge 6 to 12 hours following the at-risk activity.
• Symptoms — intense pain, red eyes, blepharospasm and tearing; usually bilateral.
• Use of eye protection? Previous episodes?

Examination:

Apply topical anesthesia ASAP — you’re unlikely to see anything if the patient refuses to open their eyes!

• Visual acuity — usually near normal
• Pupils — relatively miotic, sluggish reaction to light

Slit lamp

• Conjunctival injection
• Cornea — widespread superficial punctate epithelial defects that stain with fluorescein and are often bilateral. Mild or minimal corneal edema.
• Anterior chamber — mild AC reaction

Rule out a foreign body, chemical injury and exposure keratopathy (do the eyelids close correctly?)

• oral analgesia (may need opioids) and topical cycloplegia (e.g. 1% cyclopentolate)  for comfort for up to about 3 days
• topical antibiotics are often given
• some authorities advise a pressure patch to the most affected eye for 24 hours
• patients should return if there is not significant improvement after 24 hours

Educate the patient about the risk of UV, the use of equipment and protective gear

No

Repeated use of topical anesthesia may lead to:

• a delay in corneal healing
• chronic corneal ulceration
• inhibition of the corneal blink reflex

The eye itself is protected by reflex blinking and Bell’s phenomenon (when the eye closes, the front of the globe rolls upwards)

It depends on severity of injury and the structures involved.

Eyelid burns

• superficial burns — irrigation and topical antibacterial ointment
• partial thickness or worse — get an ophthalmology review.

Eye burns

• superficial thermal eye burns — most can be managed like a corneal abrasion if there is only epithelial involvement.
• more severe injuries (e.g. hot metal injuries) — these can result in globe perforation, and should be treated along the lines of a globe rupture

• Ehlers JP, Shah CP, Fenton GL, Hoskins EN. The Wills Eye Manual: Office and Emergency Room Diagnosis and Treatment of Eye Disease Lippincott Williams & Wilkins
• NSW Statewide Opthalmology Service. Eye Emergency Manual — An illustrated Guide. [Free PDF]