Understanding Red Eye: Causes and When to Seek Help

Waking up with a red, bloodshot eye can be alarming. The good news is that most causes of red eye are minor and resolve on their own or with simple treatment. However, some causes are more serious and require prompt attention. Knowing what to look for helps you respond appropriately.

Conjunctivitis is perhaps the most common cause of red eye. This inflammation of the thin membrane covering the white of the eye and lining the eyelids can be caused by viruses, bacteria, or allergies. Viral and bacterial conjunctivitis often produce discharge and can be contagious, while allergic conjunctivitis typically causes itching and watery eyes in both eyes simultaneously. Most conjunctivitis clears within a week or two, though bacterial cases may benefit from antibiotic drops.

Subconjunctival haemorrhage sounds dramatic but is usually harmless. A small blood vessel breaks under the conjunctiva, causing a bright red patch that looks alarming but isn't painful and doesn't affect vision. It might result from coughing, sneezing, straining, or sometimes happens without obvious cause. The redness gradually fades over a week or two without treatment.

Dry eye frequently causes redness, particularly after activities that reduce blinking, like screen use or reading. The eye becomes irritated due to inadequate tear coverage. Lubricating drops and attention to environmental factors usually help.

Blepharitis, inflammation of the eyelid margins, can cause associated redness of the eye surface. Regular lid hygiene helps manage this chronic condition.

However, certain symptoms warrant urgent attention. Pain, particularly severe pain, should prompt immediate assessment. Significant sensitivity to light, noticeably reduced vision, or a history of recent eye injury all require urgent evaluation. A red eye following eye surgery needs prompt review. These situations could indicate more serious conditions like acute glaucoma, uveitis, or corneal problems that need rapid treatment.

If you're unsure whether your red eye needs urgent attention, err on the side of caution. Optometrists can assess eye problems and either provide appropriate treatment or refer you onward if needed.

At Atlantic Home Eyecare, we can examine and advise on many eye problems during home visits. For concerning symptoms, however, please seek same-day assessment rather than waiting for a routine appointment.