Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
A red eye is usually harmless — from conjunctivitis, dryness or a burst blood vessel. But a red eye with pain, vision changes or light sensitivity can be serious and needs urgent care.
A burst small blood vessel (subconjunctival haemorrhage) — looks dramatic, harmless
Irritation from dust, smoke or chlorine
Blepharitis (eyelid inflammation)
When to see a doctor urgently
Red eye WITH pain, reduced vision, or light sensitivity — urgent (could be serious)
A red, painful eye in a contact-lens wearer (possible corneal ulcer)
Severe eye pain with halos and nausea (acute glaucoma — emergency)
Red eye after an injury or chemical splash
Pain or vision change makes it urgent. A painless red eye with normal vision is usually minor. Red eye with pain, blurred vision or light sensitivity needs same-day eye care. MedDroid gives general information, not a diagnosis.
Frequently asked questions
Why is my eye red?
Most often conjunctivitis, dryness, irritation or a harmless burst blood vessel. But a red eye with pain, blurred vision or light sensitivity can be serious.
When is a red eye serious?
When it comes with pain, reduced vision, light sensitivity, in a contact-lens wearer, or after injury/chemical splash — get urgent eye care.
Is a burst blood vessel in the eye dangerous?
Usually not — a bright red patch on the white of the eye (subconjunctival haemorrhage) looks alarming but is harmless and clears in 1–2 weeks.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.