Eye pain usually follows trauma, infection or inflammation of the eye and the surrounding structures.
Eye pain is a distressing symptom often described in different ways depending on the cause. The pain arising from the superficial structures of the eye results in burning, or sharp and shooting pain. Pain due to conditions affecting the deeper structures feels like a throbbing, aching or stabbing pain.
The cause of eye pain can be diagnosed to some extent based on the description of the pain by the patient. For example:
Pain in a single eye could be due to trauma. Pain affecting both the eyes may be due to infection or a systemic disease.
A sudden onset of severe deep-seated eye pain could indicate glaucoma.
Eye pain accompanied by purulent discharge indicates bacterial infection.
Eye pain that is not accompanied by visual symptoms may indicate that the conjunctiva or eyelids are affected. Visual disturbances are usually caused if the cornea or deeper structures are involved.
Mild pain may accompany a conjunctival infection.
A history of use of contact lenses could indicate a corneal abrasion or infection.
Eye pain that occurs in patients with conditions like rheumatoid arthritis may indicate infliction of the eyes by the disease.
In some cases like glaucoma or infection of the deeper structures, it is necessary to identify the cause and treat it early as possible to prevent permanent damage to vision.
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Source: http://www.medindia.net/symptoms/eye-pain.htm
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