How should I evaluate and treat a patient with a suspected corneal abrasion?

Evaluation and Treatment of Suspected Corneal Abrasion

Start topical fluoroquinolone drops (moxifloxacin 0.5% or levofloxacin 1.5%) within 24 hours of injury—four times daily until complete epithelial healing—to prevent bacterial keratitis, and never patch the eye. 1, 2

Initial Assessment

Visual Acuity and Examination

• Measure and document visual acuity with current correction before any other examination 1
• Perform slit-lamp biomicroscopy with fluorescein staining to confirm epithelial defect and document size, shape, depth (staining intensity), and location (central versus peripheral) 1
• Examine eyelid margins and upper lid eversion for retained foreign bodies—a linear abrasion pattern is pathognomonic for retained foreign material 1
• Avoid contact tonometry when infection or trauma is suspected 1

Critical Red Flags Requiring Immediate Ophthalmology Referral

• High-velocity injury or penetrating trauma 1, 2
• Irregular pupil after trauma 1, 2
• Eye bleeding or vision loss 1, 2
• Central infiltrate >2mm 1, 2
• Hypopyon (layered white cells in anterior chamber) 1
• Corneal infiltrate with suppuration, necrosis, or feathery margins suggesting bacterial keratitis 1, 2
• Significant stromal involvement or corneal melting 1, 2

Antibiotic Selection Algorithm

Standard (Non-Contact Lens) Abrasions

First-line: Fluoroquinolone drops are preferred over ointments because they achieve superior corneal tissue penetration 1, 2

• Moxifloxacin 0.5% or gatifloxacin 0.5%: one drop four times daily for 7 days 1, 2
• Levofloxacin 1.5%: one drop four times daily until epithelial healing confirmed 1
• Fourth-generation fluoroquinolones (moxifloxacin, gatifloxacin) provide enhanced gram-positive coverage compared to earlier generations 1

Alternative for low-risk cases: Polytrim drops four times daily for 5-7 days, with optional erythromycin ointment at bedtime for lubrication 3

Contact Lens-Related Abrasions (High Risk)

Mandatory antipseudomonal coverage with fluoroquinolones is required due to dramatically elevated Pseudomonas keratitis risk 1, 2

• Moxifloxacin 0.5% or gatifloxacin 0.5%: one drop four times daily, with more aggressive dosing frequency for severe cases 2
• Never patch the eye in contact lens wearers—patching increases bacterial keratitis risk 1, 2
• Never place therapeutic contact lenses on contact lens-related abrasions 1
• Advise complete avoidance of contact lens wear until healing confirmed by examination 2

Timing is Critical

Prophylactic antibiotics prevent ulceration specifically when initiated within 24 hours of injury—this is the therapeutic window for maximum effectiveness 1, 2

Pain Management

• Oral acetaminophen or NSAIDs are reasonable for residual discomfort 1, 3, 2
• Topical NSAIDs reduce pain at 24 hours (SMD -0.69) and 48 hours (SMD -0.56) and decrease oral analgesia use by 53%, but some guidelines advise caution as they may delay healing 4, 3
• Topical anesthetics (proparacaine, tetracaine) may be dispensed for home use—up to every 30 minutes as needed during the first 24 hours only, with no more than 1.5-2 mL total dispensed and any remainder discarded after 24 hours 5
• Cycloplegics may be considered if substantial anterior chamber inflammation is present 1

Critical Management Principles: What NOT to Do

Never Patch the Eye

Patching does not improve pain, may delay healing, and increases infection risk, especially in contact lens wearers 1, 2, 4

Never Use Steroids Initially

• Do NOT use combination steroid-antibiotic drops as initial therapy—steroids delay healing and mask infection signs 1, 2
• Steroids may only be considered after 2-3 days of antibiotic-only therapy when bacterial infection is controlled 1, 2
• Never use corticosteroids in suspected Acanthamoeba, Nocardia, or fungal infections—they worsen outcomes 1, 2

Avoid Chronic Antibiotic Use

Chronic prophylactic antibiotic use promotes resistant organisms and should only be used for finite treatment periods during the healing phase 1, 3, 2

Follow-Up Protocol

• All patients require re-evaluation within 24-48 hours to assess healing and detect early infection 1, 3, 2
• Regular follow-up is necessary to monitor healing and detect early signs of infection 1, 2
• Instruct patients on infection warning signs: increasing pain, purulent discharge, vision changes—and the need for prompt ophthalmologic care if these develop 1, 3, 2

Special Populations Requiring Enhanced Vigilance

• Contact lens wear (especially overnight wear, overwear, inadequate disinfection, swimming/hot tub use) dramatically increases infection risk 1
• Prior corneal surgery (refractive, cataract, glaucoma, keratoplasty) significantly increases infection risk 1, 2
• Chronic ocular surface disease (severe dry eye, entropion, lagophthalmos) requires enhanced vigilance 1, 2
• Immunosuppression or diabetes affects healing and antibiotic selection 1, 2

Treatment Escalation for Bacterial Keratitis

If the abrasion progresses to bacterial keratitis with central location, infiltrate >2mm, deep stromal involvement, hypopyon, or corneal stromal loss 1:

• Obtain cultures before antibiotic initiation 2
• Initiate loading dose every 5-15 minutes, then hourly dosing 1, 2
• Consider fortified antibiotics (tobramycin 1.5% + cefazolin 10%) prepared by FDA-designated 503A/503B compounding pharmacy for severe cases 1
• Fourth-generation fluoroquinolones have demonstrated at least equivalent efficacy to fortified combination therapy 1, 2

Resistance Considerations

• Methicillin-resistant Staphylococcus aureus (MRSA) accounts for approximately 42% of ocular isolates and frequently exhibits concurrent fluoroquinolone resistance 1
• Increasing resistance of MRSA and Pseudomonas to fluoroquinolones has been documented from 2005-2015 1, 2
• Despite resistance patterns, fluoroquinolones remain first-line due to superior tissue penetration and clinical efficacy 1

Evidence Quality Note

The 2024 American Academy of Ophthalmology Bacterial Keratitis Preferred Practice Pattern provides strong guideline evidence supporting broad-spectrum topical antibiotics for corneal abrasion prophylaxis 1. A 2025 Cochrane systematic review reported very low certainty evidence regarding the magnitude of benefit of prophylactic antibiotics in preventing infection or accelerating healing 6. Despite low-certainty trial data, the AAO recommends prophylactic antibiotics because of the potentially severe consequences of untreated bacterial keratitis and the low short-term risk of topical therapy 1.