Have you ever noticed your eyes looking red after a long day and assumed it was just fatigue? While tiredness can play a role, eye redness can actually signal a wide range of issues—from simple dryness and allergies to infections or even serious conditions like uveitis and glaucoma. In this educational breakdown from South Bay Retina, board-certified ophthalmologist Dr. Keshav Narain explains what really causes red eyes, how to tell when it’s harmless, and when it’s a sign y