Corneal Abrasion
A corneal abrasion is an acute epithelial defect of the transparent anterior surface of the eye that exposes the underlying Bowman layer and corneal nerves, producing sudden ocular pain, tearing and photophobia; unlike lacerations it does not penetrate the full stromal thickness and heals rapidly with appropriate care.
Symptoms
Patients experience sudden sharp or foreign-body sensation, stabbing ocular pain exacerbated by blinking, profuse reflex tearing, photophobia, blepharospasm, blurred vision from tear film irregularity and conjunctival hyperaemia; larger central defects or associated hyphema cause more marked visual disturbance, whereas peripheral abrasions chiefly elicit discomfort.
Risk Factors
Contact-lens overwear or improper hygiene, occupational metal grinding or woodworking without eye protection, participation in racquet or combat sports, exposure to plant matter or sand, ocular surface dryness, lagophthalmos, prior corneal surgery such as photorefractive keratectomy, corneal dystrophies that weaken epithelial adhesion, paediatric fingernail injuries and intoxication or sedative use that blunts blink reflexes all heighten the likelihood of corneal abrasion.
Diagnosis
Diagnosis is clinical after instilling topical anaesthetic to permit examination. Slit-lamp or penlight inspection reveals an epithelial defect that stains bright green with fluorescein and is best visualised under cobalt-blue illumination, often accompanied by mild anterior-chamber cell reaction but no infiltrate. Upper lid eversion is mandatory to exclude retained foreign bodies. Seidel testing rules out full-thickness laceration. Measurement of visual acuity precedes drops; intraocular pressure is deferred if globe rupture is suspected. CT orbit is obtained when penetration by high-velocity metallic fragments is possible.
Treatment
Immediate management removes any particulate with sterile moistened cotton or irrigation, then instils broad-spectrum topical antibiotic prophylaxis—erythromycin 0.5 % ointment four times daily for non-contact-lens wearers, or fluoroquinolone drops such as moxifloxacin 0.5 % four times daily for contact-lens users to cover Pseudomonas. Cycloplegia with homatropine 5 % twice daily relieves ciliary spasm when photophobia is marked. Oral NSAIDs or acetaminophen plus short-acting topical NSAIDs (ketorolac 0.5 % q.i.d.) reduce pain; topical anaesthetic beyond exam is avoided because it delays healing. Pressure patching is obsolete except for large (>10 mm) superior defects in non-contact-lens patients, but bandage soft contact lenses under antibiotic coverage enhance comfort when blinking is intolerable. Re-examination within twenty-four hours confirms epithelial closure; antibiotics continue forty-eight hours after healing. Persistent defects beyond seventy-two hours require ophthalmology referral for possible epithelial debridement, anterior-stromal puncture or autologous serum tears.
Outlook
Uncomplicated abrasions re-epithelialise within twenty-four to seventy-two hours and restore vision fully without scar. Delayed healing, infection progressing to microbial keratitis or recurrent erosion develops in fewer than five percent when risk factors are mitigated and follow-up ensured.
Complications
Bacterial keratitis, corneal ulceration with scarring, recurrent corneal-erosion syndrome, traumatic iritis, secondary herpetic activation and rarely hypopyon or endophthalmitis can complicate inadequately treated corneal abrasions.
Prevention
Consistent use of ANSI-certified polycarbonate safety goggles during sports, yard work and industrial tasks, rigorous contact-lens hygiene with daily replacement or hydrogen-peroxide disinfection, avoidance of overnight lens wear, prompt removal of foreign particles by irrigation, protective eyewear in UV-intense environments and maintaining adequate ambient humidity reduce corneal-abrasion incidence.
Support
Until review, avoid rubbing the eye, wear sunglasses to ease photophobia, use preservative-free artificial tears every hour while awake, adhere strictly to antibiotic schedule, abstain from contact-lens wear until advised, and sleep with the injured eye lightly taped closed to prevent nocturnal desiccation. Family members can help instil drops, monitor for increasing redness, purulent discharge or vision loss and ensure follow-up attendance.
Sources
The information presented above is supported by reputable medical sources and research publications. These references provide additional clinical insights and evidence-based findings for healthcare professionals and individuals seeking comprehensive understanding of this medical condition.
