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Causes of Pinkeye

Pediatrics Expert Advice from Henry Bernstein, M.D.

Q: My child was diagnosed with pinkeye and had to miss school because of it. It that really necessary?

A: Yes. Pinkeye (also known as "conjunctivitis") involves the outer protective part of the eyeball and inside part of the eyelids. Infection is the most common cause and is easily spread through direct contact with fingers contaminated by germs. Other things less commonly cause conjunctivitis like allergies (eyes tend to water a lot and be very itchy) or chemicals (for example, when kids are swimming underwater in a pool with their eyes open, chlorine can irritate their eyes).

Pinkeye infections are often self-limiting. Kids may feel a little scratchiness and mild pain from the redness and inflammation of the white parts of the eye. This is why they tend to rub their eyes so much. Realize that we all touch the parts of our faces -- eyes, nose, and mouth -- constantly. So, it should not be a surprise when this infection spreads to the other eye or to other kids or family members. Usually vision is not affected except by the discharge of pus that may block sight temporarily.

Both bacteria and viruses cause pinkeye, but bacteria cause it twice as often. The diagnosis is made clinically. A culture of the pus from the eye is usually not necessary. Antibiotics shorten the duration of symptoms and decrease the spread to others. Eye ointments tend to stay about the eye longer than drops do and are usually easier to apply with less fuss. However, some kids do not like the blurry, sticky feel of their eyes for up to an hour or so after applying the medicine. Depending on the severity of the infection (usually mild), antibiotics by mouth are not normally needed.

The infection tends to resolve quickly with supportive measures. The best treatment is to have the kids keep their hands away from the eyes as best they can and to use frequent hand washing to limit spread. Clear away some of the pus that causes the eyelashes to stick together with a washcloth or cottonball and warm water. Once someone with pinkeye has been on the antibiotic eye medicine for 24 hours, they are no longer considered contagious and can return to school or daycare. I recommend using the medicine for 1 day after there is no more redness or gooey discharge from the eye.

Hank Bernstein
Children's Hospital

More on: Expert Advice

Henry Bernstein, M.D., is currently the associate chief of the Division of General Pediatrics and director of Primary Care at Children's Hospital, Boston. He also has an academic appointment at Harvard Medical School.


Please note: This "Expert Advice" area of FamilyEducation.com should be used for general information purposes only. Advice given here is not intended to provide a basis for action in particular circumstances without consideration by a competent professional. Before using this Expert Advice area, please review our General and Medical Disclaimers.

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