There are four known types of pink eye: giant papillary, allergic, bacterial and viral. The medical term for pink eye is conjunctivitis. Pink eye is caused by an inflammation of the conjunctiva, the clear membrane that protects the white part of your eye and the underside of the upper and lower eyelid. There are symptoms which are common to all forms of pink eye such as tearing, watery discharge, itching and irritation, however, each type also has unique symptoms and treatment options. Consult your eye doctor for specific causes and treatments.

Types and Treatments

Allergic reactions can cause pink eye. Symptoms include swollen eyelids and will normally effect both eyes. Antihistamines are used to lessen these symptoms. If you have known allergies try to avoid them. If you can't, eyedrops and warm compresses placed on the eyes may relieve your symptoms.

Bacterial Conjunctivitis is caused by staphylococcus and streptococcus bacteria. The type of bacteria will determine the severity of the infection. Symptoms of bacterial conjunctivitis include discharge which may make the eyelids difficult to separate, redness of the eyes and swelling of the conjunctiva. Bacterial pink eye usually effects one eye but may spread to both. Your doctor will prescribe antibiotic ointment or drops as treatment for the condition.

Giant Papillary Conjunctivitis is cause by intolerance to a foreign object in the eye, usually a contact lens. It presents with heavy discharge and red bumps on the underside of the eyelid. Your doctor may prescribe eyedrops to reduce swelling and inflammation. He or she may also recommend a different type of contact lens or that you stop wearing your current pair temporarily.

Viral Conjunctivitis cannot be cured by antibiotics and will usually clear up in two to three weeks. The condition is a complication of a cold or flu. This condition is characterized by more tearing and less discharge than the other forms and may present in one or both eyes.

As pink eye can be spread, you will want to take steps to avoid spreading the infection. The simple suggestions listed below will help:

• Avoid touching your face and eyes
• Wash your hands frequently and do not reuse towels or handkerchiefs
• Avoid shaking hands with others
• Do not wear contact lenses or cover the eye
• Do not wear eye makeup or share it with others
• Clean any surfaces you have touched with a strong disinfectant

Sources:
http://www.allaboutvision.com
http://www.healthy.net
http://www.stlukeseye.com
http://pediatrica.about.com