Unilateral Red Eye Causes & Reasons

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Unilateral Red Eye Symptom Checker: Possible causes include Meibomian Cyst. Check the full list of possible causes and conditions now! Talk to our Chatbot to narrow down your search.

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Possible Causes

Meibomian Cyst

It usually presents as an acute onset of unilateral eyelid oedema, with a red and painful eye. [evidence.nhs.uk]

[…] eyelid oedema, with a red and painful eye. [evidence.nhs.uk]

Orbital cellulitis (an infection involving the deep soft tissue surrounding the eyeball, located posterior to the orbital septum) usually presents as an acute onset of unilateral [evidence.nhs.uk]

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Foreign Body in the Eye

[…] protection Symptoms Typically unilateral Irritation/foreign body sensation/pain Lacrimation Blurred vision Red eye Signs Foreign body adherent to ocular surface Linear corneal [college-optometrists.org]

Aetiology Patient often gives history of foreign body entering eye wind blown high velocity (hammering, grinding) DIY and gardening Predisposing factors Lack of suitable eye [college-optometrists.org]

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Keratitis

In the hospitalized patient with a unilateral red eye, always suspect herpes simplex keratitis. [infectiousdiseaseadvisor.com]

Answer and interpretation History: Painful red eye, altered vision, foreign body sensation, photophobia, tearing; usually unilateral Skin (e.g., eyelid) vesicular rash may [lifeinthefastlane.com]

eye Photophobia Signs of keratitis (marginal) Ulcer (stromal infiltrate with overlying epithelial loss) which may be round or arcuate, single or multiple, unilateral or bilateral [college-optometrists.org]

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Conjunctivitis

The following "red flags" point to other more serious diagnoses, such as keratitis ( inflammation of the cornea ), iritis, or angle closure glaucoma : Unilateral red eye Changes [dermnetnz.org]

The following "red flags" point to other more serious diagnoses, such as keratitis (inflammation of the cornea), iritis, or angle closure glaucoma: Unilateral red eye Changes [dermnetnz.org]

It is usually unilateral. it is the commonest cause of red eye (1) conjunctivitis in children is predominantly bacterial, with nontypeable H. influenzae being the most common [gpnotebook.co.uk]

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Eyeball Injury

An extreme eye injury can cause a globe rupture where the eyeball can split open. This can be due to trauma directly on the eye or around the eye. Watch this episode of A State of Sight with Isaac Porter, MD to learn more about this injury and the eye surgery options to help save the eye and restore vision.[…] [eyeporter.com]

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Uveitis

Symptoms [ 11 ] Acute anterior uveitis Usually unilateral. Pain, redness and photophobia are typical. Eye pain is often worse when trying to read. [patient.info]

Patients with unilateral anterior uveitis have ocular ache in the affected eye if light is shined in the unaffected eye (true photophobia), which is uncommon in conjunctivitis [msdmanuals.com]

Differential diagnosis Any cause of a red eye or visual disturbance should be included in the differential diagnosis. [patient.info]

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Anterior Uveitis

Conjunctivitis causes watering and discharge from the eye ACUTE ANTERIOR UVEITIS (IRITIS) Presentation * Painful red eye – usually unilateral. * Photophobia and watering of [redorbit.com]

Sudden onset Photophobia Ocular pain Eye redness Non-granulomatous Severe inflammation potentially resulting in: Hypopyon Anterior chamber fibrin Rarely: Papillitis Vitritis [eyewiki.org]

DIAGNOSIS Acute anterior uveitis Supporting points • Unilateral eye pain with photophobia and redness with excessive tearing for duration of 5 days. • Circumcorneal congestion [slideshare.net]

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Cluster Headache

Usually unilateral. Deep stabbing pain around the temple or the eye. [diffen.com]

Cluster headaches Deep stabbing pain around the temple or the eye, which is usually on one side (unilateral) Stuffy or runny nose Tearing or redness in eyes, droopy eyelids [belmarrahealth.com]

Stuffy or runny nose Tearing or redness in eyes, droopy eyelids Migraine Moderate to severe, throbbing head pain. [diffen.com]

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Acute Angle Closure Glaucoma

Often, closed angle glaucoma presents acutely as a painful red eye. Reference: (1) European Glaucoma Society (EGS) 2008. [gpnotebook.co.uk]

Frequently associated symptoms include eye redness, headache (classically unilateral and periorbital), nausea, vomiting, and photophobia.[3] Rarely, acute ACG can present [tamingthesru.com]

The condition is frequently bilateral and its incidence increases with age. 90% of acute attacks are unilateral (2). [gpnotebook.co.uk]

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Central Corneal Ulcer

4 More common complaints include redness, pain, pain with eye movements (suggestive of associated scleritis), blurred vision, photophobia and tearing. [ophthalmologymanagement.com]

Presentation - acute unilateral/bilateral exacerbations characterised by decreased visual acuity, with variable pain and redness (there may be none). [patient.info]

Although PUK can be bilateral and extensive, it's more often unilateral or asymmetric in its presentation, and the pathology is limited to one sector of the peripheral cornea [ophthalmologymanagement.com]

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Corneal Ulcer

Affected eyes are seen to be red and congested but inflammation does not extend beyond 3 mm from the limbus. [eyewiki.aao.org]

[…] colleagues classified the disease into three types based on clinical features, anterior segment fluorescein angiographic findings, and treatment response [1] : The first type, unilateral [eyewiki.aao.org]

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Iritis

red, painful eye. [bestbets.org]

Signs & Symptoms Acute iritis of sudden onset: Severe eye pain; Sensitivity to light; Eye redness; Smaller pupil in the affected eye (sometimes); Increased tearing. [rxmed.com]

[…] reactive pupils and eye redness. [morancore.utah.edu]

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Orbital Cellulitis

[…] of eye Unilateral presentation most common /- fever Physical exam Suggestive of periorbital cellulitis : Conjunctival discharge No vision changes Pronounced edema Suggestive [fprmed.com]

[…] are most common causes H. influenzae now an uncommon agent d/t widespread vaccination Hematogenous spread to periorbital area Rare Hx/signs & symptoms Acute swelling and redness [fprmed.com]

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Herpes Simplex Keratoconjunctivitis

Primary/recurrent episodes Herpes simplex infection may be either a primary or recurrent episode and usually presents as a unilateral red eye. [healio.com]

Topical latanoprost treatment (for glaucoma). [ 6 ] Symptoms Unilateral in about 88% of cases. (Immunosuppression: more likely to be bilateral.) Red eye. Pain. [patient.info]

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Herpes Simplex Dendritic Keratitis

History Key aspects to inquire about in the history of patients with suspected HSV include past infections (history of recurrent "red eye", particularly unilateral), underlying [eyewiki.aao.org]

Topical latanoprost treatment (for glaucoma). [ 6 ] Symptoms Unilateral in about 88% of cases. (Immunosuppression: more likely to be bilateral.) Red eye. Pain. [patient.info]

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Keratitis Bullosa

Clinical Features It usually presents with a unilateral red eye. Pain is a common feature, which may be disproportionate to the clinical signs. [goodhopeeyeclinic.org.uk]

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Smoke Inhalation Injury

Smoke inhalation injury refers to the chemical and thermal injury of the respiratory tract, as well as systemic toxicity, arising from inhalation of various irritants found in smoke. Either occupational or accidental exposure (fires, blast injuries, excessive steam, etc.) may be responsible for this type of injury.[…] [symptoma.com]

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Sjögren Syndrome

Immunoglobulin G4-related sclerosing disease (IgG4-RSD) is a fibroinflammatory condition that has the potential to affect nearly every organ system. Classic histological findings include storiform fibrosis and lymphoplasmacytic infiltrates of immunoglobulin G4 (IgG4)-positive plasma cells. The clinical features of IgG4-RSD[…] [ncbi.nlm.nih.gov]

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Chemical Conjunctivitis

[…] open Corneal opacity Fixed pupil Severe headache with nausea A unilateral red eye. [dermnetnz.org]

Herpes simplex conjunctivitis is usually unilateral. Symptoms include a red eye, photophobia, eye pain and mucoid discharge. [ncemi.org]

These conditions are typically unilateral. Nasolacrimal duct obstruction may produce a discharge, but usually the eye is not red. [clinicaladvisor.com]

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Gonococcal Conjunctivitis

Answer: Bacterial Conjunctivitis 1,2 Presentation and Pathogens: Often begins with unilateral eye redness and crusting /- irritation/pain. [emdocs.net]

Chlamydial conjunctivitis is often a unilateral disease but can involve both eyes. [webeye.ophth.uiowa.edu]

Herpes simplex conjunctivitis is usually unilateral. Symptoms include a red eye, photophobia, eye pain and mucoid discharge. [intechopen.com]

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Hordeolum

This report illustrates a retrospective case review in which extensive corneal epithelial ulceration occurred concomitantly with an internal hordeolum in the inferior forniceal conjunctiva 24 hours after an uneventful laser in situ keratomileusis. The internal hordeolum and epithelial defect were successfully managed[…] [ncbi.nlm.nih.gov]

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Vernal Conjunctivitis

Figure 1 Flow diagram for classification of red eye and its most frequently occurring causes Figure 2 Principal causes of unilateral acute red eye Both eyes should always [aerzteblatt.de]

Symptoms may be mild to severe, with unilateral redness and serous discharge spreading to the second eye one to two days later. [reviewofoptometry.com]

Keratitis : presents with a unilateral, acutely painful, photophobic, injected eye. Scleritis : severe, boring ocular pain, which may radiate to the head and face. [patient.info]

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Chemical Burn of the Cornea

Case report A 32-year-old male reported painful discomfort, redness, photophobia, and a decrease in visual acuity in the left eye after a unilateral burn with ammonium defluoridate [dovepress.com]

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Exposure Keratitis

Presentation - acute unilateral/bilateral exacerbations characterised by decreased visual acuity, with variable pain and redness (there may be none). [patient.info]

Management - treatment involves systemic immunosuppression, topical immunosuppression, ocular lubricants and globe protection (such as an eye shield). [patient.info]

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Corneal Abrasion

PURPOSE: To evaluate the effectiveness of pressure patching in the treatment of noninfected, noncontact lens-related traumatic corneal abrasions and abrasions secondary to removal of corneal foreign bodies. METHODS: Two hundred twenty-three patients with noninfected, noncontact lens-related traumatic or[…] [ncbi.nlm.nih.gov]

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Ophthalmia Neonatorum

A 3-week-old infant had neonatal ophthalmia neonatorum, treated in a routine manner which rapidly developed into an advanced case of staphylococcal scalded skin syndrome. The infant had sudden onset of widespread erythematous and tender areas of skin with subsequent exfoliation of large surface areas. We[…] [ncbi.nlm.nih.gov]

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Allergic Conjunctivitis

Keratitis : presents with a unilateral, acutely painful, photophobic, injected eye. Scleritis : severe, boring ocular pain, which may radiate to the head and face. [patient.info]

Episcleritis : mildly uncomfortable acute-onset red segment in one or both eyes. Orbital cellulitis. Foreign body Ocular herpes simplex. Herpes zoster ophthalmicus. [patient.info]

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Cavernous Sinus Thrombosis

To describe a case of ophthalmic artery occlusion associated with anisocoria and revealing a cavernous sinus thrombosis due to sinusitis. A 48-year-old man with a history of diabetes presented acutely with loss of vision and proptosis in the left eye. Ophthalmologic examination concluded in a left ophthalmic artery[…] [ncbi.nlm.nih.gov]

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Subconjunctival Hemorrhage

Presentation Red eye, usually unilateral. It is usually asymptomatic. [patient.info]

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Viral Conjunctivitis

Viral infection of conjunctiva Commonest reason for acute unilateral red eye Usually caused by adenovirus Usually preceding or concurrent symptoms of upper respiratory infection [kellogg.umich.edu]

The clinical picture is variable but usually features unilateral or bilateral eye involvement with redness, watery discharge, and swelling. [symptoma.com]

A search with fluorescein or another stain (rose bengal or lissamine green) must be done to ensure detection of conjunctival epithelial defect in a moderately red eye. [reviewofoptometry.com]

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