Redness of the Eye

The eye becomes “red” when blood vessels dilate and get larger or if a vessel has a bleed (Subconjunctival Haemorrhage). There are a variety of red eye causes, some of which can be serious.

Book a Consultation

middle aged woman wearing striped top putting eye drops into eye due to one of red eye causes

Redness of the eye, also known as “bloodshot eyes,” is a common symptom that can arise from a variety of red eye causes and underlying conditions. It can be as harmless as temporary irritation or a sign of a more serious eye problem requiring immediate medical attention.

At Centre for Sight, we understand how concerning eye redness can be—especially when accompanied by discomfort, changes in vision, or discharge. Our expert consultants are here to provide timely assessment, diagnosis of and treatment to protect your vision from red eye causes and maintain overall eye health.

Book a Consultation

Red Eye Causes

Redness occurs when the blood vessels on the surface of the eye (conjunctiva) become enlarged or inflamed. Some common red eye causes include:

Enlarged Vessels

One of the common red eye causes is enlarged vessels, which can occur from dry eye, foreign body in the eye, allergies, infection (conjunctivitis or corneal ulcer), iritis, uveitis, inflammation, contact lens overwear and injury.

Subconjunctival Bleed

A bleed, also called a subconjunctival haemorrhage, is quite common when it comes to red eye causes.

It can occur from straining sneezing and coughing.

Sometimes this can occur with prolonged use of steroid eye drops, very high blood pressure and also where there may be a problem with the clotting mechanisms of the blood.

A subconjunctival haemorrhage usually disappears in a couple of weeks.

Inflammation and Infection

Eye inflammation and infection can cause red eye and are classified according to the location of the infection.

Lids

Red eye causes also include blepharitis – inflammation or infection of the lids, base of the lashes, lash follicles, or oily secreting glands (meibomian glands). Redness of lid margins, crusty or oily secretions may be noticed.

Conjunctiva

One of the common red eye causes is inflammation or infection of the mucous lining of the eyelids and surface of the eye. Red eye in this instance is commonly called “Pink Eye”. Inflammation can be caused by an allergic reaction or irritation. Infections can be caused by virus or bacteria and can be highly contagious.

Corneal Ulcer

Infection of the cornea causes an ulcer with white cells infiltrating, along with redness, pain, and sometimes a visible white or yellow spot. The cause of this is more commonly bacterial, but it can be caused by a fungus in rare instances. The most common cause of a corneal ulcer is contact lens wear. Contact lens wearers who develop a red eye must stop wearing lenses and be seen by an ophthalmologist without delay.

Acute Glaucoma

This is an important cause of red eye that occurs when the pressure in the eye suddenly increases. There can be an associated reduction in vision and pain. This is a medical emergency.

If you are unsure about your loss of vision, contact one of our Patient Coordinators who can arrange an appointment for you to see one of our surgeons. Call 01342 306020 or email us here.

Blonde haired woman wearing grey jumper having eyes being to discover red eye causes

Symptoms with Eye Redness

Depending on the cause, you may also experience:

Burning or itching
Watery or sticky discharge
Light sensitivity
Gritty or foreign body sensation
Swollen eyelids
Blurred vision or visual disturbances
Pain in or around the eye

If any of these symptoms accompany your red eye, it’s important to consult an eye specialist without delay.

Book a Consultation

Early Detection of Red Eye Causes

Identifying the root cause early is crucial. Some red eye causes can lead to permanent vision damage if left untreated—such as uveitis, glaucoma, or corneal ulcers.

At Centre for Sight, our team uses state-of-the-art diagnostic technology to assess the eye in detail and pinpoint the underlying issue quickly. Early detection allows us to begin appropriate treatment immediately, reducing discomfort and protecting your sight.

Whether it’s a minor irritation or a sign of a more complex condition, never ignore persistent or sudden eye redness. Our expert consultants will guide you through every step, from diagnosis of red eye causes to treatment and follow-up care.

Book a Consultation