Research

Blunt Ocular Trauma from BB Gun Pellet: Long-Term Corneal Endothelial Changes

AAO Journal3d ago1 min read

A 16-year-old boy presented after a BB gun injury to the left eye (OS). Best-corrected visual acuity (BCVA) was 20/100 in OS and 20/20 in the right eye. Slit-lamp examination showed conjunctival injection, circular corneal edema with Descemet folds at the impact site of the pellet, iritis, and microhyphema (A). Intraocular pressure and fundus examination were normal. At 1-week, corneal clarity improved after topical corticosteroids and cycloplegia, with BCVA of 20/20 (B). At 4 weeks, specular microscopy showed reduced endothelial cell density (ECD: 2020 vs.

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AI Summary

Quick Take

A 16-year-old patient who sustained blunt trauma from a BB gun pellet experienced an initial drop in visual acuity to 20/100 and localized corneal edema, which resolved to 20/20 within one week. However, specular microscopy at four weeks revealed a reduced endothelial cell density of 2020 cells/mm² in the affected eye, highlighting permanent cellular damage that persists despite visual recovery.

Why It Matters

This case serves as a critical reminder that a return to 20/20 vision does not always signal a full recovery after blunt ocular trauma. While the cornea may appear clear on a standard slit-lamp exam following steroid treatment, the underlying endothelial damage can be substantial and irreversible. For a pediatric patient, starting adulthood with a significantly reduced endothelial cell count increases the long-term risk of premature corneal decompensation, particularly if they require intraocular surgery later in life. It underscores the necessity of using specular microscopy to fully assess the extent of traumatic injury.

Key Findings

Initial presentation of the BB gun injury included BCVA of 20/100, conjunctival injection, circular corneal edema with Descemet folds, iritis, and microhyphema.
Visual acuity recovered to 20/20 within one week following a regimen of topical corticosteroids and cycloplegia.
At the four-week follow-up, specular microscopy identified a reduced endothelial cell density (ECD) of 2020 cells/mm² in the injured left eye.
Despite the resolution of clinical edema and Descemet folds, the trauma resulted in lasting structural changes to the endothelial layer.

Study Snapshot

Design

Case Report

Population

Pediatric patient (16-year-old male)

Sample Size

Practice Implications

Clinicians should consider performing specular microscopy on patients with a history of blunt ocular trauma, even when the cornea appears clear and visual acuity has returned to baseline. Identifying early endothelial cell loss is essential for patient counseling regarding long-term corneal health and for informed surgical planning in the future.

Who's Affected

Comprehensive OptometristsCornea SpecialistsPediatric OphthalmologistsOphthalmic Technicians

What's Next

Long-term monitoring of the patient's endothelial health is necessary to track potential further cell attrition or compensatory remodeling, such as pleomorphism and polymegethism, over time.

Evidence StrengthPreliminary

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