When Is Eye Pain an Emergency?

Eye pain comes in two broad flavors, and the difference matters. Surface pain — burning, grittiness, a foreign-body feeling — usually comes from the cornea, the tear film, or the eyelids: dry eye, a scratch, a stye, or an eyelash rubbing the eye. Deep pain — aching, throbbing, or boring pain inside or behind the eye — points at structures inside the eye or the orbit: rising eye pressure, inflammation of the iris or sclera, or sinus and nerve problems around the eye. Pain is your eye's alarm system. Most alarms turn out to be minor, but a few patterns reliably signal something that can cost vision if it waits.

The combinations that make eye pain an emergency are well defined.

• Severe pain with headache, nausea or vomiting, halos around lights, and a red, firm eye: this is the classic picture of acute angle-closure glaucoma, where pressure spikes inside the eye within hours. Untreated, it can permanently damage the optic nerve within a day.
• Pain with marked light sensitivity: inflammation inside the eye (iritis/uveitis) or a corneal ulcer. Both need prompt prescription treatment.
• Pain after a chemical splash: rinse immediately for 15–20 minutes, then seek emergency care — alkalis like drain cleaner or cement keep burning after contact.
• Pain after trauma or a high-speed particle (grinding, hammering, mowing): the eye needs same-day examination even if it looks nearly normal.
• A painful, red, light-sensitive eye in a contact lens wearer: assume microbial keratitis — a corneal infection that can scar the eye within days — until an exam says otherwise.
• Deep, boring pain that radiates to the brow or jaw and wakes you from sleep: think scleritis, which threatens the eye wall and often signals autoimmune disease.
• Pain with a bulging eye, fever, or pain on eye movement: possible orbital infection (orbital cellulitis), a same-day emergency.

By contrast, brief stinging that clears with a blink, mild end-of-day dryness, or the tender pimple of a stye at the lash line are uncomfortable but rarely dangerous. The separating factors are severity, persistence, light sensitivity, vision change, and how the pain started.

Treat eye pain as an emergency — call us the same day at (717) 637-1919, or go to the emergency room after hours — when pain comes with any of the following:

• Decreased or lost vision, a new curtain or shadow, or new flashes and floaters
• Halos around lights, headache, nausea, or a firm, red eye
• Marked light sensitivity or a white/cloudy spot on the cornea
• Chemical exposure (rinse first, for 15–20 minutes, then be seen)
• Trauma, a possible foreign body, or any high-speed particle exposure
• Contact lens wear with a red, painful eye
• Fever, a bulging eye, lid swelling that spreads, or pain when moving the eye
• Deep pain severe enough to wake you from sleep

The evaluation is targeted at the dangerous causes first. Vision is checked in each eye, the pupils are examined, and eye pressure is measured — a markedly elevated pressure supports the suspected emergency within minutes, and the slit-lamp examination with gonioscopy (a mirrored lens that views the drainage angle) establishes whether the angle is actually closed. The slit lamp also shows the cornea (with fluorescein dye to reveal scratches, ulcers, or foreign bodies) and any inflammation inside the front chamber. When the story suggests deeper trouble, a dilated exam checks the retina and optic nerve. The pattern of findings separates a surface problem you can treat at home from one that needs prescription drops, pressure-lowering treatment, or urgent referral.

Treatment follows the cause, which is why the exam comes first.

• Acute angle-closure glaucoma: immediate pressure-lowering medicines, then a laser iridotomy to reopen the drainage pathway.
• Corneal ulcers and infectious keratitis: intensive antibiotic (or antiviral/antifungal) drops, started promptly.
• Iritis and scleritis: anti-inflammatory treatment, plus a workup for an underlying cause when it recurs.
• Abrasions and foreign bodies: removal of the particle, lubrication or antibiotic ointment, and follow-up until the surface heals.
• Styes and lid problems: warm compresses and lid care, with in-office treatment for stubborn cases.

Surface irritation from dryness responds to lubricating drops — but drops should never be used to push through pain that is severe or worsening.

• Do not wait days on severe pain, pain with vision change, or pain with light sensitivity.
• Do not keep wearing a contact lens in a painful red eye.
• Do not rub the eye or press on it, and do not try to dig out a foreign body.
• Do not patch the eye or use leftover prescription drops — steroid drops can make an infection dramatically worse.
• Do not drive yourself if your vision is impaired; have someone take you.