Clinical Presentation and Management of Conjunctivitis

Key Distinguishing Features

The American Academy of Ophthalmology notes that viral conjunctivitis typically presents with abrupt onset, often unilateral initially but frequently becomes sequentially bilateral, and is accompanied by a follicular reaction of the inferior tarsal conjunctiva 1, 2
Viral conjunctivitis is often accompanied by concurrent upper respiratory infection, and preauricular lymphadenopathy may be present, especially with adenoviral infections 1, 2
The disease can cause chemosis, eyelid swelling, and erythema, and may even resemble orbital cellulitis in severe cases, with a duration that is self-limited, typically resolving within 5-14 days 1, 3
Severe cases of viral conjunctivitis may develop pseudomembranes, subepithelial corneal infiltrates, conjunctival scarring, and in rare cases, lacrimal stenosis 1

Bacterial Conjunctivitis

Bacterial conjunctivitis can be unilateral or bilateral, and is characterized by a purulent or mucopurulent discharge, with a papillary rather than follicular reaction 4
The condition may be associated with concurrent bacterial otitis media, sinusitis, or pharyngitis, particularly in children, and preauricular lymphadenopathy is less common than in viral conjunctivitis unless caused by hypervirulent organisms 4
Corneal infection is a potential complication, particularly with virulent organisms like gonococcus 4

Special Considerations

Gonococcal conjunctivitis presents with marked eyelid edema, bulbar conjunctival injection, purulent discharge, and preauricular lymphadenopathy, and can lead to corneal infiltrate or ulcer, and potentially corneal perforation 4
Herpes simplex virus conjunctivitis usually presents unilaterally, though can be bilateral in atopic, pediatric, or immunocompromised patients, with distinctive signs including vesicular rash or ulceration of eyelids, and dendritic epithelial keratitis of cornea 2

Management Implications

Indiscriminate use of topical antibiotics should be avoided as viral conjunctivitis will not respond to antibacterial agents, according to the American Academy of Ophthalmology 5

Distinguishing Between Viral and Bacterial Conjunctivitis

Clinical Presentation and Treatment Approach

Viral conjunctivitis and bacterial conjunctivitis have distinct clinical presentations that guide diagnosis and treatment approaches, with viral cases typically being self-limited while bacterial cases may benefit from antibiotic therapy in moderate to severe presentations, as recommended by the American Academy of Ophthalmology 6, 7
The majority of viral conjunctivitis cases are self-limited and do not require antimicrobial treatment, according to the American Academy of Ophthalmology 8, 9
Supportive care options for viral conjunctivitis include artificial tears for symptomatic relief, as suggested by the American Academy of Ophthalmology 8, 9
Topical antihistamines may be used for symptomatic relief in viral conjunctivitis, as recommended by the American Academy of Ophthalmology 8, 9
Patient education about high contagiousness is essential, and patients should be encouraged to minimize contact with others for 10-14 days from symptom onset, as advised by the American Academy of Ophthalmology 8, 7
Mild bacterial conjunctivitis is usually self-limited and may resolve without specific treatment, but topical antibiotics may decrease the duration of the infection, as stated by the American Academy of Ophthalmology 10
For moderate to severe bacterial conjunctivitis, a 5-7 day course of broad-spectrum topical antibiotic is usually effective, as recommended by the American Academy of Ophthalmology 10
No evidence exists demonstrating the superiority of any particular topical antibiotic agent for bacterial conjunctivitis, according to the American Academy of Ophthalmology 6, 10
Chronic and/or recalcitrant conjunctivitis may indicate underlying malignancy, such as sebaceous or squamous cell carcinoma, and requires further evaluation, as warned by the American Academy of Ophthalmology 11
The American Academy of Ophthalmology recommends avoiding indiscriminate use of topical antibiotics or corticosteroids, as they may lead to unnecessary side effects and delayed diagnosis of underlying conditions 6, 11

Management of Conjunctivitis

Diagnosis and Classification

A comprehensive history should focus on duration of symptoms, character of discharge, unilateral vs bilateral presentation, and associated symptoms, as recommended by the American Academy of Ophthalmology 12, 13
Physical examination should evaluate for conjunctival injection, type of discharge, presence of follicles or papillae, preauricular lymphadenopathy, and corneal involvement, according to the American Academy of Ophthalmology 12, 14

Treatment Algorithm

Allergen-specific immunotherapy is beneficial in reducing symptoms, more so in children than adults, as stated by the American Academy of Ophthalmology 14
A multidisciplinary approach with pediatricians, internists, and allergists is recommended for management of allergic conjunctivitis, as suggested by the American Academy of Ophthalmology 14

Special Considerations

Visual loss, moderate or severe pain, severe purulent discharge, corneal involvement, conjunctival scarring, lack of response to therapy, recurrent episodes, history of HSV eye disease, and history of immunocompromise are indications for referral to an ophthalmologist, as recommended by the American Academy of Ophthalmology 15
Chlamydial conjunctivitis requires systemic treatment and evaluation of sexual partners, as stated by the American Academy of Ophthalmology 15
Neonatal conjunctivitis requires prompt evaluation and may need hospitalization for parenteral therapy, as recommended by the American Academy of Ophthalmology 15
Ligneous conjunctivitis is a rare form caused by plasminogen deficiency requiring specialized treatment, as noted by the American Academy of Ophthalmology 15

Prevention Strategies

Proper hand hygiene with soap and water, avoiding sharing personal items like towels and pillows, and disinfecting surfaces with EPA-registered hospital disinfectant can help prevent infectious conjunctivitis, as recommended by the American Academy of Ophthalmology 14, 13
Allergen avoidance and consideration of immunotherapy for severe cases can help prevent allergic conjunctivitis, as suggested by the American Academy of Ophthalmology 14
Appropriate lens care and frequent lens replacement can reduce the risk of giant papillary conjunctivitis in contact lens wearers, as recommended by the American Academy of Ophthalmology 14

Common Pitfalls to Avoid

Indiscriminate use of topical antibiotics or corticosteroids should be avoided, as warned by the American Academy of Ophthalmology 13
Inadequate patient education about contagiousness may lead to community spread, as noted by the American Academy of Ophthalmology 14

Differentiating and Treating Viral vs Bacterial Conjunctivitis

Key Clinical Differentiators

Viral conjunctivitis typically presents with watery discharge, follicular reaction on the inferior tarsal conjunctiva, and preauricular lymphadenopathy, while bacterial conjunctivitis characteristically shows mucopurulent discharge with matted eyelids and a papillary rather than follicular reaction 16
The American Academy of Ophthalmology notes that viral conjunctivitis often has a follicular pattern on inferior tarsal conjunctiva, preauricular lymph node enlargement, and an abrupt onset, often starting unilateral but becoming sequentially bilateral 16
Subconjunctival hemorrhages, chemosis, eyelid swelling, and erythema are distinctive findings in viral conjunctivitis 16
Chlamydial conjunctivitis requires systemic treatment and evaluation of sexual partners, with PCR or immunofluorescent antibody testing for confirmation 17

Conjunctivitis Management Guidelines

Initial Management by Etiology

The American Academy of Ophthalmology recommends avoiding antibiotics entirely for viral conjunctivitis, as they provide no benefit and may cause toxicity 18
For allergic conjunctivitis, environmental modifications such as wearing sunglasses as a barrier to airborne allergens, using cold compresses and refrigerated artificial tears, and avoiding eye rubbing are recommended 19
Topical antihistamines with mast cell-stabilizing activity are first-line treatment for allergic conjunctivitis, according to the American Academy of Ophthalmology 20
For severe cases of viral conjunctivitis, topical corticosteroids may be considered, but with extreme caution and close follow-up, as recommended by the American Academy of Ophthalmology 18, 21

Critical Red Flags Requiring Immediate Ophthalmology Referral

Visual loss or decreased vision requires urgent referral to an ophthalmologist, as recommended by the American Academy of Ophthalmology 21

Follow-Up Recommendations

Patients with severe viral conjunctivitis should be re-evaluated within 1 week, and those not on corticosteroids should return if symptoms persist beyond 2-3 weeks, according to the American Academy of Ophthalmology 21
Regular monitoring of IOP and pupillary dilation is required for patients on topical corticosteroids, as recommended by the American Academy of Ophthalmology 21, 20

Conjunctivitis Diagnosis and Management

Clinical Presentation and Diagnosis

Allergic conjunctivitis is characterized by bilateral presentation, often seasonal or perennial depending on allergen exposure, and may have concurrent allergic rhinitis or asthma, according to the American Academy of Ophthalmology 22
The pattern of allergic conjunctivitis can be distinguished by itching as the most consistent and distinguishing feature, with watery discharge, and absence of preauricular lymphadenopathy and matted eyelids, as recommended by the American Academy of Ophthalmology 22

Treatment Approach by Etiology

For viral conjunctivitis, corticosteroids may be considered for severe cases, but require close ophthalmology follow-up for monitoring intraocular pressure and cataract formation, and may prolong viral shedding and worsen HSV infections, as cautioned by the American Academy of Ophthalmology 22
Bacterial conjunctivitis management involves a 5-7 day course of broad-spectrum topical antibiotic, with no superiority of specific agents, and the American Academy of Ophthalmology recommends choosing the most convenient or least expensive option 23
Allergic conjunctivitis management involves topical antihistamines with mast cell-stabilizing activity as first-line treatment, and environmental modifications such as wearing sunglasses and using cold compresses, as recommended by the American Academy of Ophthalmology 22
Refractory cases of allergic conjunctivitis may require short-term corticosteroids, and the American Academy of Ophthalmology recommends a brief 1-2 week course with low side-effect profile 22

Special Considerations

Gonococcal conjunctivitis requires systemic treatment in addition to topical therapy, and can lead to corneal perforation, as warned by the American Academy of Ophthalmology 23
Chlamydial conjunctivitis requires systemic treatment and evaluation of sexual partners, as recommended by the American Academy of Ophthalmology 23
MRSA is increasingly isolated, but fluoroquinolones remain effective, according to the American Academy of Ophthalmology 23

Common Pitfalls to Avoid

Topical corticosteroids should not be used indiscriminately, as they can prolong adenoviral infections, worsen HSV infections, and cause increased intraocular pressure and cataracts, as cautioned by the American Academy of Ophthalmology 22
Contact lens wear should be avoided during any form of infectious conjunctivitis, as recommended by the American Academy of Ophthalmology 22
Vasoconstrictor rebound can occur with chronic use of topical vasoconstrictor agents, as warned by the American Academy of Ophthalmology 22

Sudden Onset Eye Redness and Watering Without Pain or Vision Changes

Management of Allergic Conjunctivitis

The American Academy of Allergy, Asthma, and Immunology recommends topical antihistamines with mast cell-stabilizing activity, such as olopatadine or ketotifen, as first-line treatment for allergic conjunctivitis in patients with itching as the predominant symptom, with a strength of evidence based on clinical trials 24
The American Academy of Allergy, Asthma, and Immunology suggests oral antihistamines as an additional option for patients with allergic conjunctivitis, although they are less effective than topical agents for ocular symptoms, with a moderate level of evidence 24

Treatment of Conjunctivitis with Periocular Swelling

Immediate Assessment and Red Flags

The American Academy of Ophthalmology recommends referring patients with conjunctivitis urgently to ophthalmology if they present with visual loss or decreased vision, moderate or severe pain, severe purulent discharge, corneal involvement, history of herpes simplex virus eye disease, or immunocompromised state 25

Determine Etiology Based on Clinical Features

Treatment by Etiology

For severe cases of viral conjunctivitis with marked chemosis and lid swelling, the American Academy of Ophthalmology suggests considering a short course of topical corticosteroids, with close monitoring of intraocular pressure and periodic pupillary dilation 25
The American Academy of Ophthalmology recommends systemic therapy for gonococcal conjunctivitis, in addition to topical treatment, with hospitalization necessary for parenteral therapy, daily follow-up until resolution, and treatment of sexual contacts 25
For chlamydial conjunctivitis, the American Academy of Ophthalmology advises systemic therapy, as topical therapy alone is inadequate, with treatment of sexual contacts and re-evaluation after treatment 25

Follow-Up Recommendations

The American Academy of Ophthalmology recommends re-evaluating patients with severe cases of conjunctivitis and corneal involvement or membranous conjunctivitis within 1 week, including interval history, visual acuity measurement, and slit-lamp biomicroscopy 25
For patients on topical corticosteroids, the American Academy of Ophthalmology suggests regular monitoring of intraocular pressure and periodic pupillary dilation 25

Critical Pitfalls to Avoid

The American Academy of Ophthalmology advises against using antibiotics indiscriminately for viral conjunctivitis, as they can cause unnecessary toxicity, and against using topical corticosteroids without close ophthalmology follow-up, due to the risk of elevated intraocular pressure, cataract formation, and worsening HSV infections 25
The American Academy of Ophthalmology emphasizes the importance of not missing gonococcal conjunctivitis, as it can cause corneal perforation and requires immediate systemic treatment 25

Treatment of Red Eye

Clinical Differentiation and Treatment

The American Academy of Ophthalmology recommends that antibiotics should not be prescribed for viral conjunctivitis, as they provide no benefit and may cause unnecessary toxicity 26
For mild cases of bacterial conjunctivitis, topical antibiotics may shorten the duration of the disease, and a 5-7 day course of broad-spectrum topical antibiotic is recommended for moderate to severe cases 26
The American Academy of Ophthalmology suggests that no specific antibiotic is superior for bacterial conjunctivitis, and the most convenient or least expensive option should be chosen, such as erythromycin ointment, polymyxin B/trimethoprim drops, or fluoroquinolones 26
The American Academy of Ophthalmology advises against the indiscriminate prescription of antibiotics for viral conjunctivitis, as this contributes to resistance and causes unnecessary side effects 26

Treatment of Conjunctivitis

Initial Diagnostic Approach

The American Academy of Ophthalmology recommends considering recent ocular surgery as a critical factor in the diagnosis of conjunctivitis 27
The American Academy of Ophthalmology suggests that a history of atopy, asthma, or eczema is a key distinguishing feature of allergic conjunctivitis, which typically presents with itching, bilateral involvement, and watery discharge with a mild mucous component 27, 28

Treatment by Etiology

Allergic Conjunctivitis

The American Academy of Ophthalmology recommends topical antihistamines with mast cell-stabilizing activity as first-line treatment for allergic conjunctivitis, with options including olopatadine and ketotifen 27, 28

Treatment of Conjunctivitis in Children

Initial Assessment and Treatment

Bacterial conjunctivitis may be associated with concurrent otitis media in children, and treatment should consider this association 29
Refer urgently to an ophthalmologist if there are signs of severe infection, such as moderate or severe pain, severe purulent discharge, or corneal involvement 30, 31, 29, 32
The American Academy of Ophthalmology recommends referral to an ophthalmologist for signs of conjunctival scarring, lack of response to therapy, or recurrent episodes 30, 31
In cases of suspected gonococcal conjunctivitis, systemic antibiotic therapy is necessary in addition to topical treatment, and daily follow-up is required until resolution 30, 31, 32

Infection Control and Counseling

Strict hand hygiene is essential to prevent transmission to others or to the unaffected eye, and the Centers for Disease Control and Prevention recommend washing hands frequently with soap and water 30, 31, 32

Red Flags Requiring Immediate Ophthalmology Referral

The presence of visual loss, decreased vision, or history of herpes simplex virus eye disease requires urgent referral to an ophthalmologist 30, 31, 29, 32
A history of immunocompromise is a red flag for conjunctivitis and requires urgent referral to an ophthalmologist 31

Diagnostic Considerations for Bacterial Conjunctivitis

Risk Assessment in Sexually Active Patients

In sexually active individuals presenting with bacterial conjunctivitis, clinicians should perform an aggressive diagnostic work‑up—including conjunctival Gram stain and culture—because of the heightened risk of Neisseria gonorrhoeae infection, which can be sight‑threatening if missed. 33

Effect of Prior Empiric Antibiotic Therapy

The accuracy of bacterial conjunctivitis diagnosis is frequently reduced when patients have received empiric topical antibiotics before cultures are obtained, as prior treatment can suppress bacterial growth and lead to false‑negative culture results. 33

Testing Recommendations for Bacterial Conjunctivitis

General Management

Routine bacterial conjunctivitis in otherwise healthy patients can be diagnosed clinically and treated empirically with broad‑spectrum topical antibiotics without the need for laboratory testing. 34
Performing cultures for uncomplicated cases is generally not cost‑effective and does not usually influence treatment decisions. 34

Clinical Criteria for Empiric Diagnosis

Diagnosis is supported by the presence of mucopurulent or purulent discharge, papillary conjunctival reaction, unilateral or bilateral involvement, and the absence of severe pain or significant vision loss. 34

High‑Risk Situations Requiring Microbiologic Testing

Neonatal conjunctivitis (suspected infectious etiology) – mandatory culture and susceptibility testing. 34
Gonococcal conjunctivitis in any age group – mandatory culture, Gram stain, and susceptibility testing. 34
Recurrent, severe, or chronic purulent conjunctivitis – culture and susceptibility testing recommended. 34
Failure to improve after an initial course of topical antibiotics (typically 5–7 days) – obtain cultures and susceptibility testing. 34

Recommended Laboratory Techniques

Conjunctival scrapings with Gram and Giemsa stains are advised for suspected neonatal infection, chronic/recurrent disease, and suspected gonococcal infection. 34
Conjunctival cultures should be collected before initiating antibiotic therapy whenever feasible to avoid false‑negative results caused by prior empiric treatment. 34

Differentiating Bacterial from Viral Conjunctivitis

Viral conjunctivitis typically presents with watery discharge, follicular conjunctival reaction, and pre‑auricular lymphadenopathy; diagnosis relies on rapid immunodiagnostic tests or PCR for adenovirus. 34

Clinical Decision Algorithm (Summary)

Step 1 – Risk Assessment: Identify high‑risk features (neonatal status, gonococcal suspicion, immunocompromise, or lack of response to therapy). 34
Step 2 – High‑Risk Cases: Obtain conjunctival scrapings for Gram stain and culture prior to starting systemic or topical antibiotics. 34
Step 3 – Uncomplicated Cases: Initiate empiric broad‑spectrum topical antibiotics without laboratory testing. 34
Step 4 – Treatment Failure: If no clinical improvement after 5–7 days, perform cultures and request antibiotic susceptibility testing. 34

Evidence‑Based Indicators for Red Eye with a Clear Cornea

History Assessment

Obtaining a detailed contact‑lens history—including lens type, overnight wear schedule, exposure to tap water, and hygiene practices—is essential when evaluating a patient with red eye and a clear cornea, because lens‑related factors can predispose to infectious or inflammatory conjunctivitis. 35

Diagnostic Indicators

The absence of any corneal opacity, haze, ulceration, or infiltrate strongly suggests conjunctivitis rather than keratitis; a clear cornea is therefore a key distinguishing feature that guides diagnosis and management. [35][36]

Red‑Flag Findings Requiring Urgent Referral

The detection of conjunctival scarring in a patient with red eye and a clear cornea constitutes a red‑flag sign that mandates immediate ophthalmology referral (within 24 hours) to rule out serious underlying pathology. 35

Outpatient Management of Conjunctivitis (Evidence‑Based Recommendations)

Supportive Care for Improving Conjunctivitis

Preservative‑free artificial tears should be prescribed to enhance comfort, coupled with strict hand‑hygiene education; patients should be instructed to return for evaluation if symptoms do not improve or worsen within 2–3 weeks. 37

Viral Conjunctivitis – Symptomatic Measures

Cool artificial tears provide symptomatic relief and help dilute ocular surface allergens and inflammatory mediators in patients with viral conjunctivitis. 37, 38
Application of a cold compress reduces conjunctival swelling and improves patient comfort. 37, 38
Routine use of topical antibiotics is not recommended for viral conjunctivitis because they offer no clinical benefit and may cause unnecessary toxicity. 37, 38

Hand‑Hygiene and Transmission Prevention

Patients should wash hands with soap and water regularly, especially after touching the eyes or face, to limit spread of infection. 37
Sharing personal items such as towels, pillows, or other linens should be avoided to reduce transmission risk. 37
Rubbing the eyes should be discouraged, as it can exacerbate irritation and facilitate pathogen spread. 37, 38

Contagious Period and Environmental Survival

The causative virus may remain infectious on dry surfaces for up to 28 days, underscoring the need for environmental cleaning. 37

Red‑Flag Symptoms Requiring Urgent Ophthalmology Referral

Moderate to severe ocular pain that does not improve warrants immediate specialist evaluation. 37
Heavy purulent discharge is a warning sign for possible bacterial superinfection and should prompt urgent review. 37
Signs of corneal involvement—such as blurred vision or marked photophobia—necessitate prompt referral. 37

Avoidance of Inappropriate Medications

Topical corticosteroids must not be used indiscriminately in conjunctivitis because they can prolong adenoviral infection and aggravate herpes simplex virus infection. 37, 38
Chronic use of vasoconstrictive eye drops should be avoided due to the risk of rebound vasodilation after discontinuation. 38
Multi‑dose eye‑drop containers should be discarded if they accidentally contact the ocular surface to prevent cross‑contamination. 37

Allergic Conjunctivitis (Predominant Itching)

First‑line therapy consists of topical antihistamines with mast‑cell‑stabilizing properties (e.g., olopatadine or ketotifen). 38
Wearing sunglasses can act as a physical barrier against airborne allergens. 37, 38
Patients should avoid known allergens and consider hypoallergenic bedding to reduce exposure. 37

Urgent Evaluation and Symptomatic Management of Conjunctivitis (Evidence‑Based)

Red‑Flag Assessment

Patients who have undergone recent ocular surgery or experienced ocular trauma should receive an immediate same‑day ophthalmology referral because these histories are associated with a higher risk of sight‑threatening complications such as corneal ulceration or intra‑ocular infection. 39

Supportive Care for Viral Conjunctivitis

In cases of viral conjunctivitis, the use of preservative‑free topical antihistamine agents (e.g., olopatadine) provides symptomatic relief of itching and redness without affecting the course of the viral infection. 39

Management of Infectious Conjunctivitis with Drainage

Diagnostic Approach

History

Watery discharge strongly suggests a viral etiology, whereas mucopurulent or purulent discharge with matted eyelids on waking points toward bacterial conjunctivitis. [40][41]
Absence of itching helps differentiate infectious conjunctivitis from allergic conjunctivitis, in which itching is a hallmark symptom. [41][42]
Recent close contact with individuals who have conjunctivitis or a concurrent upper‑respiratory‑tract infection favors a viral cause. [40][41]
Inquiry about recent sexual activity and genitourinary symptoms is essential for identifying gonococcal or chlamydial conjunctivitis, which require systemic antimicrobial therapy. [43][42]
Contact‑lens wear raises concern for bacterial keratitis and warrants urgent ophthalmologic evaluation. [40][41]

Physical Examination

Any corneal opacity, infiltrate, or ulceration constitutes an ocular emergency and mandates immediate referral to an ophthalmologist. 40
Conjunctival scarring or pseudomembrane formation are red‑flag findings indicating potentially serious underlying pathology. [40][44]

Management

Viral Conjunctivitis (most common)

The condition is self‑limited, typically resolving within 5–14 days; supportive care (preservative‑free artificial tears, cold compresses) is the mainstay. 43
Topical antibiotics should be avoided because they provide no clinical benefit and may cause toxicity. [44][43]
Patient education should emphasize hand hygiene, avoidance of shared towels/pillows, and limiting close contact for 10–14 days from symptom onset to reduce transmission. [44][43]

Bacterial Conjunctivitis

Mild cases often resolve without therapy, but topical antibiotics can shorten the disease course and enable earlier return to work or school. [44][43]
For moderate to severe presentations, prescribe a 5–7 day course of a broad‑spectrum topical antibiotic. 43
No single antibiotic has proven superiority; clinicians may select the most convenient or cost‑effective option (e.g., erythromycin ointment, polymyxin B/trimethoprim drops, or a fluoroquinolone). [44][43]

Special Situations Requiring Systemic Therapy

Gonococcal conjunctivitis is a hyper‑acute, vision‑threatening emergency; immediate parenteral antimicrobial therapy plus topical treatment and hospitalization are required. [44][43]
Chlamydial conjunctivitis also necessitates systemic antibiotics and evaluation/treatment of sexual partners; topical agents alone are insufficient. [43][42]

Red‑Flag Findings Prompting Urgent Ophthalmology Referral

New or worsening visual loss. 40
Moderate to severe ocular pain (beyond mild irritation). 40
Corneal involvement (opacity, infiltrate, ulceration). [40][44]
Conjunctival scarring or pseudomembrane formation. 40
History of herpes simplex virus eye disease. 40
Immunocompromised status. 40
Lack of clinical improvement after 5–7 days of appropriate therapy. 40
Contact‑lens wear associated with conjunctivitis (risk of bacterial keratitis). [40][41]

Common Pitfalls to Avoid

Indiscriminate use of topical corticosteroids can prolong adenoviral infections, exacerbate herpes simplex keratitis, and increase intra‑ocular pressure or cataract formation. [44][43]
Prescribing antibiotics for viral conjunctivitis contributes to antimicrobial resistance and exposes patients to unnecessary adverse effects. [44][43]
Failure to recognize gonococcal conjunctivitis may lead to corneal perforation and permanent vision loss. 43
Inadequate counseling about the contagious nature of infectious conjunctivitis facilitates community spread. 43

Clinical and Diagnostic Evidence for Viral and Allergic Conjunctivitis

Clinical Features of Viral Conjunctivitis

Diagnostic Testing for Viral Conjunctivitis

Diagnostic Testing for Allergic Conjunctivitis

Gonococcal Conjunctivitis: Emergency Management

Systemic Antibiotic Therapy

In patients with hyperacute gonococcal conjunctivitis—a vision‑threatening emergency—immediate systemic therapy with a single intramuscular dose of ceftriaxone (250 mg) plus a single oral dose of azithromycin (1 g) is recommended, accompanied by daily ophthalmology follow‑up until clinical resolution; untreated infection can lead to corneal perforation within 24 hours. 46