return to eye conditions

Conjunctivitis is an inflammation of the conjunctiva, the thin, clear tissue that lies over the white part of the eye and lines the inside of the eyelid. This tissue helps keep the eyelid and eyeball moist.

What Causes Conjunctivitis?

Conjunctivitis has a number of different causes, including:

• Viruses
• Bacteria (such as gonorrhea or chlamydia)
• Irritants such as shampoos, dirt, smoke, and pool chlorine
• Allergies, like dust, pollen, or a special type of allergy that affects some contact lens wearers
• Sexually transmitted diseases

Conjunctivitis caused by some bacteria and viruses can spread easily from person to person, but are not a serious health risk if diagnosed promptly.

What Are the Symptoms of Conjunctivitis?

The symptoms of conjunctivitis differ based on the cause of the inflammation, but may include:

• Redness in the white of the eye or inner eyelid
• Increased amount of tears
• Thick yellow discharge that crusts over the eyelashes, especially after sleep
• Green or white discharge from the eye
• Itchy eyes
• Burning eyes
• Blurred vision
• Increased sensitivity to light

See your eye doctor if you have any of these symptoms of conjunctivitis. He or she will conduct an exam of your eyes and may take a sample of fluid from the eyelid using a cotton swab to be analyzed in a microbiology lab. Bacteria or viruses that may have caused conjunctivitis, including a sexually transmitted disease or STD, can then be identified and proper treatment prescribed.