Ocular hyperemia means increased blood flow in the small vessels on the surface of the eye, making the white of the eye look red. It is a sign, not a diagnosis. Common causes include dryness, allergy, infection, contact-lens irritation and exposure to smoke or dust. Redness with pain, light sensitivity, reduced vision, injury or contact-lens wear needs prompt professional assessment.
Seek urgent eye care for a red eye with severe pain, blurred or reduced vision, marked light sensitivity, chemical exposure, trauma, severe headache with nausea/vomiting, or worsening symptoms in a contact-lens wearer.
Hyperemia is increased blood flow within a tissue. In the eye, conjunctival or ocular hyperemia describes widened surface blood vessels that make the eye appear pink or red. The appearance may be mild and diffuse or more intense around a particular area. Because many conditions cause red eyes, the pattern must be considered together with pain, discharge, vision, light sensitivity and medical history.
| Cause | Typical clues | Action |
|---|---|---|
| Dry eye | Burning, grittiness, fluctuating blur | Examination if persistent |
| Allergy | Itching, watering, often both eyes | Avoid triggers; obtain advice if troublesome |
| Conjunctivitis | Redness with watery or sticky discharge | Assessment if severe, persistent or uncertain |
| Blepharitis | Crusting, burning, irritated eyelid margins | Eye and eyelid examination |
| Contact-lens complication | Pain, redness, discharge, light sensitivity or blur | Remove lenses and seek same-day care |
| Corneal or internal eye inflammation | Pain, photophobia, reduced vision | Urgent professional assessment |
No. Hyperemia usually appears as many widened red vessels. A subconjunctival haemorrhage is a sharply defined patch of blood under the clear conjunctiva. It can look dramatic and is often painless, but an eye-care professional should assess it when it follows injury, recurs, affects vision, causes pain, or is associated with other concerning symptoms.
An eye examination may include visual acuity, pupil responses, eyelid and tear-film assessment, slit-lamp examination of the conjunctiva and cornea, fluorescein dye when a surface injury is suspected, and eye-pressure measurement when clinically appropriate. Treatment depends on the cause; redness alone should not be treated as a diagnosis.
Vision Concern Eye Clinic and Optical provides eye examinations at Lazimpat near Radisson Hotel, Boudha-Tushal opposite KFC, and Makalbari–Pragati Chowk. View comprehensive eye examination information or contact Vision Concern by WhatsApp.
Often it is caused by a minor surface problem, but the cause cannot be judged from redness alone. Pain, light sensitivity, reduced vision, injury and contact-lens-related redness are warning signs.
Yes. Allergy commonly causes itching, watering and redness, often in both eyes. Pain or reduced vision suggests that another cause should be excluded.
No. Remove the lenses and seek prompt advice if redness is accompanied by pain, light sensitivity, discharge or blurred vision.
This page provides general information and does not diagnose an individual condition. Medically reviewed by Yadav Raut – Master in Optometry (Norway). Last medically reviewed: 1 September 2026.
Use these guides to understand common eye symptoms, then arrange an examination when symptoms persist, worsen or affect vision.
This information is educational and does not diagnose a condition or replace an examination by a qualified eye-care professional.
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