Eye Conditions

Red eye

A red or bloodshot eye is very common and usually harmless — but it has many possible causes, and a few need prompt attention. Knowing which is which helps you decide whether to wait it out or get it checked.

What it is

Redness happens when the tiny blood vessels on the surface of the eye widen or leak. Most of the time it's from something minor — tiredness, dryness, a little irritation, or a harmless burst blood vessel.

Occasionally, though, a red eye is a sign of something that needs treating — like inflammation inside the eye, infection, or raised pressure — especially when there's pain or a change in vision.

Signs a red eye needs checking

Pain in the eye (not just irritation)
Blurred or reduced vision
Sensitivity to light
A red eye that follows an injury
Redness that doesn't settle in a few days

Recognise these? Book a consultation and we'll help you get to the bottom of it.

When to seek help urgently

A red eye with pain, light sensitivity or blurred vision — or after an injury — should be assessed promptly, as it can point to something that needs treating, such as uveitis or raised pressure.

What causes it

Common, minor causes include dry eye, tiredness, allergies, and a harmless burst blood vessel (subconjunctival haemorrhage).

Causes that need care include conjunctivitis, uveitis (inflammation inside the eye), and — rarely — acute glaucoma.

How we help

Dr Leong can quickly work out what's behind a red eye and rule out anything that needs treating, then guide you on the right care.

If your red eye comes with pain or a change in vision, don't wait — that's the kind we'd always rather see sooner.

Explore General Ophthalmology

Common questions

When is a red eye serious?

The warning signs are pain (not just irritation), blurred vision, light sensitivity, or redness after an injury. Any of these should be checked promptly. Redness on its own, without those, is usually minor.

Why is part of my eye bright red?

A bright red patch on the white of the eye is often a subconjunctival haemorrhage — a harmless burst blood vessel that looks alarming but clears on its own over a week or two, a bit like a bruise.

Is a red eye contagious?

It depends on the cause. Some kinds of conjunctivitis are contagious; dry eye, allergies and a burst blood vessel are not. If in doubt, it's worth having it identified.

Should I use redness-relief drops?

Best not to rely on them — 'get the red out' drops can mask a problem and, used often, make redness worse. It's better to find the cause, especially if the eye is uncomfortable or your vision is affected.

This page is general information, not medical advice, and doesn't replace a consultation. For anything specific to your own eyes, call us for advice or to book an appointment with Dr Leong on 04 470 7663.

Ready to see clearly?

Book a consultation with Dr Leong, or call the clinic to talk it through. We're here to help you see your very best.

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