Pepper spray ( also called OC spray , from Oleoresin capsicum ) is a spray used for self-defence , by spraying it into an attacker 's face . It makes eyes water and causes intense pain , sometimes even leading to temporary blindness . Pepper spray , also known as OC spray ( from `` Oleoresin Capsicum '' ) , OC gas , and capsicum spray , is a lachrymatory agent ( a chemical compound that irritates the eyes to cause tears , pain , and even temporary blindness ) that is used in riot control , crowd control , and personal self-defence , including defense against dogs and bears .