Eye Pain

Eye pain is a catch-all phrase to describe discomfort on, in, behind or around the eye.

The pain can be unilateral or bilateral — in other words, you can experience right eye pain, left eye pain, or the discomfort can affect both eyes. There's no evidence that right eye pain occurs more frequently than left eye pain, or vice versa.

In some cases, such as an eye injury, the cause of the pain is obvious. But often it's difficult to know why your eye hurts.

To complicate matters, the severity of eye pain does not indicate how serious the underlying cause of the discomfort is. In other words, a relatively minor problem, such as a superficial abrasion of the cornea, can be very painful. But several very serious eye conditions — including cataracts, macular degeneration, the most common type of glaucoma, a detached retina, and diabetic eye disease — cause no eye pain whatsoever.

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A painful eye can produce various sensations and accompanying symptoms, which can help your eye doctor determine the cause of your discomfort and prescribe the correct eye pain treatment. These include:

A sharp, stabbing sensation
Burning eyes
A dull ache
Feeling something is "in" your eye (foreign body sensation)
Eye pain also is frequently accompanied by blurred vision, redness (bloodshot eyes) and sensitivity to light.

Causes of eye pain
Here are common causes of eye pain, based on the location of the discomfort

Pain on or in your eye
Often, eye pain that feels like something is in the eye actually is caused by irritation or inflammation of the front surface of the eye, particularly the cornea.

Common causes of pain emanating from the front surface of the eye or inside the eye include:

Corneal foreign body. Not surprisingly, what often causes a foreign body sensation in the eye is an actual foreign body. Common foreign bodies that can adhere to and become embedded in the surface of the cornea include metal shavings, inorganic grit (sand, tiny stone particles), sawdust and other organic material.

The discomfort from a corneal foreign body can range from mild to severe, and typically it is most bothersome when you're blinking (since the eyelid often is rubbing across it during blinks). Blurred vision and sensitivity to light also are common.

A corneal foreign body requires urgent attention from an eye doctor, because material embedded in the cornea can quickly cause a serious eye infection.

Most corneal foreign bodies can be removed easily in the doctor's office with the proper tools. Antibacterial eye drops may be prescribed to prevent infection while the cornea heals.

Corneal abrasion. This is a scratched cornea. Although most corneal abrasions are not serious, they can be very uncomfortable and cause light sensitivity and watery eyes.

Many superficial corneal scratches heal on their own within 24 hours. But deeper abrasions can lead to a serious eye infection and even a corneal ulcer if left untreated.

Because it's often impossible to tell if eye pain is due to a minor scratch, a deep abrasion or a corneal foreign body, it's a good idea to see an eye doctor for any sharp discomfort of the eye that does not resolve very quickly, to determine the underlying cause.

Dry eyes. Another very common cause of eye discomfort is dry eyes. Usually dry eye discomfort begins more slowly and gradually than eye pain from a corneal foreign body or abrasion. Sometimes dry eyes can lead to a corneal abrasion, because there are not enough tears on the surface of the eye to keep the cornea moist and slippery.

If using lubricating eye drops significantly improves comfort, the cause of the pain is probably dry eyes. In most cases, dry eye does not require urgent attention; but your eye doctor can perform tests to determine the severity of the dryness and recommend the most effective treatment.


Other (less common) causes of anterior eye pain, or pain "in" the eye, include:

Conjunctivitis (pink eye)
Eye infections (including fungal eye infections and Acanthamoeba keratitis)
Iritis (anterior uveitis), which is inflammation of the iris
Contact lens discomfort
A very serious cause of pain in the eye is a condition called endophthalmitis (en-dahf-thal-MITE-is), which is inflammation of the interior of the eye that most often is caused by a bacterial infection. It also can occur as a rare complication of cataract surgery.

Endophthalmitis, in addition to causing eye pain, causes redness, swollen eyelids and decreased vision. If you have these symptoms after cataract surgery or other eye surgery, see your eye doctor immediately.