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Contact lens wearers may experience conjunctival injection if a lens does not fit properly. Excessive mechanical irritation can cause the loosely attached tissue to become edemic and inflamed. The conjunctiva is also susceptible to inflammation of a viral, bacterial or allergic nature. These conditions always contraindicate contact lens wear and must be carefully screened for at every visit.
Noncompliance with this rule would slow down the healing process due to the limited oxygen supply reaching the eye. Furthermore, soft lenses would need to be disposed of in cases of viral or bacterial insult. Reusing the lens would risk re-infection of the eye.