Conjunctivitis (patient information): Difference between revisions
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What is conjunctivitis?
Conjunctivitis (commonly called "pink eye" or "Madras eye"[1]) is an acute inflammation of the conjunctiva (the outermost layer of the eye and the inner surface of the eyelids), most commonly due to an allergic reaction or an infection (usually viral, but sometimes bacterial[2]). Conjunctivitis is an irritating and fairly common condition, but rarely causes long term eye or vision damage.
What are the symptoms of conjunctivitis?
Redness (hyperaemia), irritation (chemosis) and watering (epiphora) of the eyes are symptoms common to all forms of conjunctivitis.
Additionally, symptoms vary based on the specific type of conjunctivitis:
Allergic conjunctivitis
Allergic conjunctivitis is typically itchy, sometimes distressingly so, and often involves some eye swelling. Chronic allergy often causes just itching or irritation. Allergic conjunctivitis often causes pale watery swelling of the conjunctiva and sometimes the whole eyelid. There is frequently a sticky mucous discharge, and there is variable redness.
Viral conjunctivitis Viral conjunctivitis is often associated with an infection of the upper respiratory tract, a common cold, and/or a sore throat. Its symptoms include watery discharge and variable itch. The infection usually begins with one eye, but may spread easily to the other. Viral conjunctivitis is commonly known as "pink eye."
Bacterial conjunctivitis Bacterial conjunctivitis due to the common pyogenic (pus-producing) bacteria causes marked grittiness/irritation and a stringy, opaque, grey or yellowish mucopurulent discharge (mucus, gowl, goop, gunk, eye crust, or other regional names, officially known as 'gound') that may cause the lids to stick together (matting), especially after sleeping. Another symptom that could be caused by bacterial conjunctivitis is severe crusting of the infected eye and the surrounding skin. However, discharge is not essential to the diagnosis, contrary to popular belief. Bacteria such as Chlamydia trachomatis or Moraxella can cause a non-exudative but persistent conjunctivitis without much redness. The gritty and/or scratchy feeling is sometimes localized enough for patients to insist they must have a foreign body in the eye. The more acute pyogenic infections can be painful. Like viral conjunctivitis, it usually affects only one eye but may spread easily to the other eye. However, it is dormant in the eye for three days before the patient shows signs of symptoms.
Chemical conjunctivitis Irritant or toxic conjunctivitis is irritable or painful when the infected eye is pointed far down or far up. Discharge and itch are usually absent. It show primarily marked redness. This is the only group in which severe pain may occur.
What are the causes of conjunctivitis?
Conjunctivitis is most commonly caused by viruses, often adenovirus, but many other factors can lead to its occurrence. Other causes include:
- Allergies (allergic conjunctivitis)
- Bacteria
- Certain diseases
- Chemical exposure
- Chlamydia
- Fungi
- Parasites (rarely)
- Use of contact lenses (especially extended-wear lenses)
Additionally, newborns can be infected by bacteria in the birth canal. This condition is called ophthalmia neonatorum, and it must be treated immediately to preserve eyesight.
Commonly, conjunctival infections are passed from person-to-person due to lack of hygiene measures.
Who is at risk for conjunctivitis?
People who are exposed to someone infected with the viral or bacterial form of conjunctivitis are at risk for developing conjunctivitis. Children and adults can develop both bacterial and viral conjunctivitis, however bacterial conjunctivitis is more common in young children.
Additionally, babies born to mothers infected with either Neisseria gonorrhoeae or Chlamydia trachomatis are at an increased risk for conjunctivitis. During delivery, these babies can contract ophthalmia neonatorum, a form of bacterial conjunctivitis when their eyes are exposed to the bacterial in the birth canal. It must be treated immediately to prevent blindness.
How to know you have conjunctivitis?
Conjunctivitis may make you feel like you have something in your eye(s) that you cannot get out. Your eyes may feel crusted over or pasted shut when you wake up in the morning and there may be a discharge coming from the eyes. If the discharge has a yellow-greenish color, the cause of infection is more likely to be bacterial. The whites of the eyes usually have a pink or reddish cast to them. Other symptoms include:
- Eye pain
- Increased tearing
- Itching of the eye
- Sensitivity to light
Except in obvious pyogenic (pus-producing) or toxic/chemical conjunctivitis, a slit lamp (biomicroscope) is needed to have any confidence in the diagnosis. Even after biomicroscopy, laboratory tests are often necessary if proof of etiology is needed.
When to seek urgent medical care
Call for an appointment with your health care provider if your symptoms last longer than 3 or 4 days.
Treatment options
Diseases with similar symptoms
Where to find medical care for conjunctivitis
Directions to Hospitals Treating conjunctivitis
Prevention of conjunctivitis
Good hygiene can help prevent the spread of conjunctivitis:
- Change pillowcases frequently.
- Change towels and wash cloths daily.
- Do not share personal articles that come in contact with the eyes (e.g. eye make-up applicators, towels, wash cloths, eye droppers)
- Handle and clean contact lenses properly.
- Keep hands away from the eye.
- Replace eye cosmetics regularly.
- Wash your hands often.
- Always wash hands with soap and water or an alcohol based hand sanitizer prior to and following contact with a person who has conjunctivitis.
What to expect (Outlook/Prognosis)
Sources
http://www.nlm.nih.gov/medlineplus/ency/article/001010.htm
http://www.in.gov/isdh/21205.htm
- ↑ "Beware, `Madras eye' is here!". The Hindu. 2001-10-12. Retrieved 2008-10-30.
- ↑ Langley JM. Adenoviruses. Pediatr Rev. 2005;26:238-242.