How to treat irritation and redness?

Red eye: the most common reason for red eye is simple infection and allergy but there are more serious causes for red eye and irritation, if there is no change in vision, no pain with eye movement, no blurry vision most likely the reason is either eye infection (accomponied with discharge) or allergy (accomponied with itching and watering). for allergy try to avoid allergen, for infection see your doctor.