Soldiers blinded by mustard gas in World War I.
Mustard gas is an alkylating agent. Contact with the conjunctiva and cornea causes pain, 
photophobia, tearing, blepharospasm, blurred vision, chemical conjunctivitis, corneal 
damage, conjunctival necrosis, corneal opacification, cornea pannus, secondary glaucoma 
and chronic keratitis. Superficial eyelid damage may lead to chronic ectropion, trichiasis, 
and symblepharon formation. 
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