Unilateral optic disc swelling in a fighter pilot.

Area of Science:

• Ophthalmology
• Aerospace Medicine
• Neurosurgery

Background:

• Optic disc swelling, or papilledema, results from obstructed axonal transport in the lamina cribrosa.
• Etiologies include compression, ischemia, inflammation, metabolic, and toxic factors, necessitating differential diagnosis.
• Some causes are life-threatening, while others are self-limited, highlighting the importance of accurate diagnosis.

Observation:

• A 25-year-old fighter pilot experienced unilateral optic disc swelling after F-16 flight, suspected to be decompression-related.
• Visual acuity decreased to 20/25 with visual field defects; funduscopy revealed disc swelling, hemorrhages, and venous engorgement.
• Neurological and ophthalmological examinations were otherwise normal, with no other concurrent diseases identified.

Findings:

• Decompression sickness with nitrogen bubbles was suspected as the cause of optic nerve head vasculature obstruction.
• Treatment with hyperbaric oxygen led to rapid improvement in visual acuity and resolution of optic disc swelling within 6 days.
• The patient successfully returned to high-performance aviation duties 3 months post-onset with no recurrence during 3-year follow-up.

Implications:

• This case highlights decompression sickness as a potential cause of optic disc swelling in aviators.
• Early recognition and hyperbaric oxygen therapy are crucial for visual recovery and return to flight status.
• Understanding this etiology is vital for maintaining the health and operational readiness of high-performance aviators.