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Pink eye (conjunctivitis)

Pink eye (conjunctivitis)
Pink eye (conjunctivitis) is an inflammation or infection of the transparent membrane (conjunctiva) that lines your eyelid and part of your eyeball. Inflammation causes small blood vessels in the conjunctiva to become more prominent, which is what causes the pink or red cast to the whites of your eyes. The cause of pink eye is commonly a bacterial or viral infection, an allergic reaction or — in newborns — an incompletely opened tear duct. Though the inflammation of pink eye makes it an irritating condition, it rarely affects your sight. If you suspect pink eye, you can take steps to ease your discomfort. But because pink eye can be contagious, early diagnosis and treatment is best to help limit its spread. Symptoms
The most common pink eye symptoms include: • Redness in one or both eyes • Itchiness in one or both eyes • A gritty feeling in one or both eyes • A discharge in one or both eyes that forms a crust during the night • Tearing Pink eye may make you feel as if you've got something in one or both of your eyes that you just can't remove. When you wake up in the morning, your eyes may seem to be pasted shut from the discharge coming from your eyes. • Viruses • Bacteria • Allergies • A chemical splash in the eye • A foreign object in the eye Viral and bacterial conjunctivitis
Viral conjunctivitis and bacterial conjunctivitis may affect one or both eyes. Viral
conjunctivitis usually produces a watery or mucous discharge. Bacterial conjunctivitis
often produces a thicker, yellow-green discharge and may be associated with a
respiratory infection or with a sore throat. Both viral and bacterial conjunctivitis can be
associated with colds.
Both viral and bacterial types are very contagious. Adults and children alike can develop both of these types of pink eye. However, bacterial conjunctivitis is more common in children than it is in adults. Allergic conjunctivitis
Allergic conjunctivitis affects both eyes and is a response to an allergy-causing
substance such as pollen. In response to allergens, your body produces an antibody
called immunoglobulin E (IgE). This antibody triggers special cells called mast cells in
the mucous lining of your eyes and airways to release inflammatory substances,
including histamines. Your body's release of histamine can produce a number of
allergy signs and symptoms, including red or pink eyes.
If you have allergic conjunctivitis, you may experience intense itching, tearing and inflammation of the eyes — as well as itching, sneezing and watery nasal discharge. You may also experience swelling of the membrane (conjunctiva) that lines your eyelids and part of your eyeballs, resulting in what may look like clear blisters on the whites of your eyes. Conjunctivitis resulting from irritation
Irritation from a chemical splash or foreign object in your eye is also associated with
conjunctivitis. Sometimes, flushing and cleaning the eye to rid it of the chemical or
object causes redness and irritation. Signs and symptoms, which may include a
mucous discharge instead of pus, usually clear up on their own within about a day.
Risk factors
• Exposure to an allergen for allergic conjunctivitis • Exposure to someone infected with the viral or bacterial form of conjunctivitis Both viral and bacterial conjunctivitis are common among children and are very contagious. Someone with conjunctivitis may be contagious for seven to 14 days after signs and symptoms first appear. People who wear contact lenses, especially extended-wear lenses, may be more prone to conjunctivitis. When to seek medical advice
Pink eye can be an irritating condition, but it's usually harmless to your sight and typically doesn't require extensive or emergency treatment. Yet because pink eye can be highly contagious for as long as two weeks after signs and symptoms begin, it's important to seek diagnosis and treatment early. Keep children with bacterial conjunctivitis away from child care facilities or school until after they start treatment. Children with viral conjunctivitis may be contagious for several days to as long as a week or more. Check with your doctor if you have any questions about when your child can return to school or child care. Most schools and child care facilities require that your child wait at least 24 hours after starting treatment before returning to school or child care. Although pink eye often gets better without treatment, it can be accompanied by an inflammation of the cornea, which can affect vision. For this reason, an examination by a qualified eye physician is important to determine what management option is best for you or your child. Tests and diagnosis
Your doctor may take a sample of eye secretions from the conjunctiva for laboratory analysis to determine which form of infection you have and how best to treat it. If you have a young infant with recurrent pink eye or persistent eye tearing, your child may have a blocked tear duct. Your child's pediatrician may closely monitor the situation to see if the tear duct opens on its own, or you may be referred to an eye specialist (ophthalmologist) for further evaluation and treatment. Treatments and drugs
Bacterial conjunctivitis
If your infection is bacterial, your doctor may prescribe antibiotic eyedrops as pink eye
treatment, and the infection should clear within several days. Antibiotic eye ointment,
in place of eyedrops, is sometimes prescribed for treating bacterial pink eye in
children. An ointment is often easier to administer to an infant or young child than are
eyedrops, though they may blur vision for up to 20 minutes after application. With
either form of medication, you should notice a marked improvement in signs and
symptoms within one to two days. Be sure to use the medication for the entire time
your doctor prescribes it, to prevent recurrence of the infection.
Viral conjunctivitis
Viral conjunctivitis doesn't respond to treatment with antibiotic eyedrops or ointment.
Like with a common cold, you can use an over-the-counter remedy to relieve some
symptoms, but the virus just has to run its course. You may notice a worsening of
symptoms in the first three to five days. After that, your signs and symptoms should
gradually clear on their own. It may take up to two to three weeks from the time you
were infected for the virus to go away.
Allergic conjunctivitis
If the irritation is allergic conjunctivitis, your doctor may prescribe one of many different
types of eyedrops. These may include antihistamines, decongestants, mast cell
stabilizers, steroids and anti-inflammatory drops.
Prevention
Practicing good hygiene is the best way to control the spread of pink eye. Once the infection has been diagnosed, follow these steps: • Don't touch your eyes with your hands. • Wash your hands thoroughly and frequently. • Change your towel and washcloth daily, and don't share them with others. • Change your pillowcase often. • Discard eye cosmetics, particularly mascara. • Don't use anyone else's eye cosmetics or personal eye-care items. • Follow your eye doctor's instructions on proper contact lens care. If your child is infected, avoid close contact with other children. Many schools send children with conjunctivitis home, and will likely ask that your child receive at least one full day of treatment before returning. Preventing pink eye in newborns
Newborns' eyes are susceptible to bacteria normally present in the mother's birth
canal. These bacteria cause no symptoms in the mother. In rare cases, these bacteria
can cause infants to develop a serious form of conjunctivitis known as ophthalmia
neonatorum, which needs treatment without delay to preserve sight. That's why shortly
after birth, every newborn's eyes are protected with a preventative application of an
antibiotic, such as erythromycin ointment.
Lifestyle and home remedies
You can soothe the discomfort of pink eye by applying warm compresses to your affected eye or eyes. To make a compress, soak a clean, lint-free cloth in warm water and wring it out before applying it gently to your closed eyelids. For allergic conjunctivitis, avoid rubbing your eyes so that you don't release more histamines. Instead, use cool compresses to soothe your eyes. You might also try specially formulated over-the-counter eyedrops such as Naphcon-A or Opcon-A, which contain an antihistamine and an agent that constricts blood vessels. 1998-2008 Mayo Foundation for Medical Education and Research (MFMER). All rights reserved. A single copy of these materials may be reprinted for noncommercial personal use only. "Mayo," "Mayo Clinic," "MayoClinic.com," "EmbodyHealth," "Reliable tools for healthier lives," "Enhance your life," and the triple-shield Mayo Clinic logo are trademarks of Mayo Foundation for Medical Education and Research. DS00258

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