Red Eye: Is It Pink Eye, Allergies, or Something Worse? conjunctivitis · contact lens · corneal ulcer · eye allergies · eye emergency · iritis · pink eye · red eye · subconjunctival hemorrhage · uveitis · Oct 09, 2026 A red eye can be a nuisance or an emergency. Here's how to tell pink eye from allergies and dry eye, and the warning signs that mean you should call us the same day.