I burned my corneas....with a blast oven for molten glass.

Every pain since... is measured on a one to ten scale...when asked by a doctor:
COMPOUND Fractor, right hand = 6
Acute appendix = 7
Burnt cornea = 10

GPC Is pretty awful....but two washes with vitamin C produces a cure overnight.

Sincerely,
Gargoyle

an ophthalmologist has explain why straight pool chlorine is more dangerous to the eye than a splash of pool acid.