This video shows swelling of the conjunctiva that is classically seen with allergy. The conjunctival tissue is only loosely adherent to the underlying sclera and can look impressive when swollen with edema.
Ocular allergies are usually self-limited and can be treated with cool compresses and anti-allergens like Patanol, Zaditor (now over-the-counter), or cromolyn.
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chemosis.wmv (2.3meg, Windows video file)