What is Red Eyes?
A red eye can be alarming but is often just a sign of a minor eye condition, such as conjunctivitis or a burst blood vessel. If it is painful, there may be a more serious problem. Ocular pain is often associated with a red eye.
SN Diagnosis History Examination 1 Subconjunctival haemorrhage Typically asymptomatic, spontaneous. May be associated with trauma Unilateral (except some trauma) contiguous red area 2 Viral conjunctivitis Foreign body sensation, watering, no visual loss or photophobia, ?Recent contact with person with red eye or URTI Bilateral, prominent inflamed conjunctival vessels, follicles, enlarged tender preauricular lymph node 3 Bacterial conjunctivitis Foreign body sensation, discharge, no visual loss or photophobia Bilateral, prominent inflamed conjunctival vessels, mucopus 4 Allergic conjunctivitis Itch, watering, no visual loss or photophobia, history of atopy Bilateral, prominent inflamed conjunctival vessels, follicles 5 Iritis (anterior uveitis) Reduced vision, aching sensation, photophobia, PMH or systemic enquiry may elicit underlying disease Unilateral, prominent pericorneal vessels, small pupil, aqueous cells and protein (at slit lamp), hypopyon 6 Acute angle-closure glaucoma Severe pain, haloes/rainbows around lights, redused vision, hypermetropic, elderly Unilateral, pericorneal prominent vessels, semidilated (oval) pupil, corneal oedema, shallow anterior chamber (slit lamp) 7 Episcleritis Mild discomfort, tenderness, no visual loss or photophobia, young adult, otherwise fit and well Unilateral, typically sectorial prominent inflamed subconjunctival vessels (may also be nodular or diffuse) 8 Scleritis Significant aching pain, tender, photophobia, occasionally reduced vision, systemic enquiry may elicit underlying disease Unilateral, typically sectorial prominent inflamed deep scleral vessels (may also be nodular or diffuse) 9 Becterial keratitis Foreign body sensation, watering/discharge, visual loss, photophobia, ? Pre-existing ocular surface disease, recent trauma or contact lens wear Unilateral, opacity in cornea (slit lamp) stains with fluorescein 10 Herpetic viral keratitis Foreign body sensation, watering/dischange, visual loss, photophobia, ?Cold scores or ophthalmic shingles Unilateral, branching linear dendrite(s) on cornea (slit lamp) stains with fluorescein
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