- General Eye Condition
- Medical Management
Red Eye
Redness in the white of the eye, caused by anything from mild irritation to an infection that needs treatment.
- Very common
- Usually harmless
- Non-surgical treatment
- Can affect one or both eyes
Clinical photograph. Presentation varies by cause and isn’t intended for self-diagnosis.
What is Red Eye?
Red eye describes redness in the white part of the eye, caused by swollen or irritated blood vessels close to the surface. It’s one of the most common reasons people seek eye care, and on its own it’s a sign rather than a diagnosis: dozens of different conditions can cause it.
Most cases come from something mild and short-lived, like a minor irritation, a burst blood vessel or a passing infection (NHS: red eye). Some causes are more serious, particularly when the redness comes with real pain, light sensitivity or reduced vision.
Because so many different conditions share the same symptom, working out the cause matters more than treating the redness itself. A specialist assessment identifies what’s actually going on, rather than guessing from the colour of the eye alone.
Symptoms to Look Out For
- Redness in one or both eyes, mild to intense
- Watering or discharge
- Gritty, itchy or burning sensation
- Sensitivity to light
- Blurred or reduced vision
- Eye pain, rather than just discomfort
- Swelling around the eye or eyelid
Could it be something else?
The exact cause shapes what “something else” means here. Crusty, persistently red eyelid margins point to blepharitis, sticky discharge with contagious spread points to conjunctivitis, and gritty discomfort without much visible redness may be dry eye.
- When to seek help
If you have real eye pain, reduced vision or light sensitivity, seek same-day advice.
These aren’t typical of a mild, self-limiting red eye and can point to something that needs prompt treatment to protect your vision.
What Causes Red Eye?
Redness comes from many different causes, and treatment depends entirely on which one is behind yours.
Infection or inflammation
Conjunctivitis, blepharitis and similar conditions inflame the eye's surface or lids.
Burst blood vessel
A subconjunctival haemorrhage looks alarming but is usually harmless and painless.
Dryness or irritation
Dry eye, smoke, chlorine or a foreign body can all leave the eye red.
Deeper eye conditions
Rarer causes like uveitis need urgent treatment, especially with pain.
Redness Looks the Same From the Outside. The Cause Rarely Is.
A red eye can mean a burst blood vessel that needs nothing at all, or a deeper problem that needs same-day treatment, and the two can look almost identical to the naked eye. Mr Aziz examines the eye itself rather than going on description alone, so the plan matches what’s actually happening, not just how it looks.
1
Thorough examination
A close look at the eye, eyelids and pupil response under magnification.
2
Rule out urgent causes
Checking for pain, vision changes or signs that need same-day treatment.
3
Targeted treatment plan
Drops, referral or reassurance, whichever the actual cause calls for.
Treatment Options
Treatment follows the cause, and ranges from no treatment at all to urgent same-day care.
Watchful waiting
Many mild cases, like a burst blood vessel, need nothing more than time to settle.
Targeted drops or treatment.
Infections, allergies and dryness each respond to a specific, correctly matched treatment.
Urgent referral
Signs of a deeper problem mean same-day referral and treatment.
Related reading
Frequently asked questions.
What causes a red eye?
Most often a minor irritation, a burst blood vessel, dry eye, or an infection like conjunctivitis. Less commonly, it’s a sign of a deeper problem in the eye that needs prompt attention. The pattern of accompanying symptoms usually points toward which one it is.
Why is my eye red but not painful?
A painless red eye is often something minor: a burst blood vessel, mild dryness, or the early stage of conjunctivitis before other symptoms develop. Painless doesn’t rule out every cause, but it does make an urgent one less likely.
Why is my eye red and painful?
Pain alongside redness is worth taking seriously. It can still be something straightforward, but it’s also the pattern seen in more urgent causes, so it’s the combination that warrants a same-day look rather than either symptom alone.
Is a red eye always serious?
No. Most red eyes are mild and settle on their own or with simple treatment. Real pain, light sensitivity, reduced vision, or redness that doesn’t improve within a few days are the signs worth having checked.
When should I worry about a red eye?
When it comes with pain, blurred or reduced vision, sensitivity to light, or redness after an injury to the eye. Any of these, especially combined with redness, is worth same-day advice rather than waiting.
What is a subconjunctival haemorrhage?
A small blood vessel breaking under the clear surface of the eye, leaving a bright red patch. It looks dramatic but is usually painless and harmless, clearing on its own within one to two weeks without treatment.
Can stress or lack of sleep cause red eyes?
Indirectly. Tiredness doesn’t cause redness by itself, but it can make you rub your eyes more, dry them out, or leave blood vessels more visible, all of which show up as redness the next morning.
How can I get rid of red eyes fast?
It depends on the cause, which is exactly why a quick assessment helps. Cool compresses and lubricating drops ease mild irritation, but an infection or allergy needs a treatment matched to it rather than a generic fix.
Is a red eye contagious?
Only if it’s caused by a viral or bacterial infection, most commonly conjunctivitis. A burst blood vessel, dry eye or allergic redness isn’t contagious at all, since there’s no infection involved.
Can contact lenses cause red eye?
Yes. Wearing lenses too long, poor hygiene, or a lens that doesn’t fit well can all irritate the eye’s surface and cause redness. Persistent redness in a contact lens wearer is worth an assessment rather than pushing through it.
Should I go to A&E for a red eye?
Usually not, unless it follows a significant injury, chemical exposure, or comes with sudden vision loss. For most other cases, including a painful or worrying red eye, a same-day specialist assessment is the more appropriate route.
What's the difference between red eye and conjunctivitis?
Red eye is the symptom: redness in the white of the eye, whatever the cause. Conjunctivitis is one specific cause of it, an inflammation of the eye’s surface that’s often contagious. Many red eyes aren’t conjunctivitis at all.
Can allergies cause red eye?
Yes, allergic conjunctivitis is a common cause, usually alongside itching and watering rather than pain. It tends to affect both eyes and often tracks with a known trigger like pollen or pet dander.
Will a red eye affect my vision?
Most causes don’t. Blurred or reduced vision alongside redness is one of the specific signs that points to something needing prompt attention, rather than something typical of a mild, self-limiting case.
Is the £195 consultation fee redeemable against treatment?
Yes. The consultation fee is deducted from the cost of any treatment you go on to have with Mr Aziz.
Can over-the-counter redness-relief drops help?
They narrow the blood vessels on the surface of the eye, which can mask the appearance quickly but doesn’t treat whatever’s causing it underneath. They’re fine for occasional, obviously mild redness, but relying on them for more than a few days is worth turning into a proper assessment instead.
Could something be stuck in my eye?
Yes, and it’s one of the more common reasons for a sudden, painful red eye. A foreign body like an eyelash, grit or a contact lens fragment can scratch the surface and needs removing properly rather than rubbed at, which can make the scratch worse.
How long is too long for a red eye to last?
A mild, painless case that clears within a few days usually doesn’t need urgent attention. Beyond about a week, or if it’s getting worse rather than settling, it’s worth an assessment rather than continued waiting and guessing at the cause yourself.
Can screen time cause red eyes?
Indirectly, yes. Reduced blinking during long screen sessions dries the eye’s surface, which can leave it looking red and feeling gritty by the end of the day. Taking regular breaks and blinking deliberately helps more than any drop.
Not Sure If This Is What You Have?
A specialist assessment will give you clarity — and a plan.