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February 9, 2012

Pink Eye (cont.)

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What noninfectious conditions cause pink eye, what are noninfectious pink eye symptoms, and how are they treated?

Allergic pink eye

Allergic pink eye symptoms and signs are usually accompanied by intense itching, tearing, and swelling of the eye membranes. Pain is minimal or absent. Frequent causes include seasonal pollens, animal dander, and dust. It is frequently seasonal and accompanied by other typical allergy symptoms such as sneezing, itchy nose, or scratchy throat. Cold, moist washcloths applied to the eyes and over-the-counter decongestant eyedrops can provide relief. Your doctor can prescribe stronger medications if these home remedies are not adequate.

Chemical pink eye

Chemical pink eye can result when any irritating substance enters the eyes. Common offending irritants are

  • household cleaners,


  • sprays of any kind,


  • smoke,


  • foreign objects in the eye,


  • smog,

  • industrial pollutants.

Prompt, thorough washing of the eyes with very large amounts of water is very important if an irritating substance enters the eye. Your doctor or your local poison-control center should be contacted at once, even if you think the irritant or chemical is safe, as some of the most common household products like bleach and furniture polish can be very damaging.

Underlying diseases

Persistent pink eye (conjunctivitis) can be a sign of an underlying illness in the body. Most often these are rheumatic diseases, such as rheumatoid arthritis and systemic lupus erythematosus. Conjunctivitis is also seen in Kawasaki's disease (a rare disease associated with fever in infants and young children) and certain inflammatory bowel diseases such as ulcerative colitis and Crohn's disease.

Subconjuctival hemorrhage

Bright redness of the whites of the eyes can also occur when the tiny blood vessels covering the whites of the eyes rupture from trauma or changes in pressure within the head (for example, after forceful laughing or vomiting, when diving under water, or even bending upside down). This condition is called subconjunctival hemorrhage, and while it can appear frightening, it is generally harmless. This condition is different from the inflammation of the conjunctiva seen with pink eye. It causes a local area of the white portion of the eye (the sclera) to become brilliantly reddened. It does not typically involve the colored portion of the eye (the iris) and does not affect vision.


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