Could single use of pepper spray cause permanent damage to eyes?

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Yes, it may cause permanent harm. But, the injury depends on the type of damage done to the eye. Otherwise, it can be washed immediately and get the treatment done to prevent any permanent damage.

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In the majority of cases, there will not be any damage because we have so many protective shields in the eye like eyelids, lashes, tears, etc., to guard against such chemicals. Lids close very fast without our permission in case of any danger and tears will flush the spray which enters the eye. So with this protection, the eyes are safe. In rare cases, it may cause damage to the cornea and may cause damage to the vision. Having said that, I recommend to wash eyes with water in such incident and consult a local ophthalmologist immediately.