Oestrus ovis ophthalmomyiasis with keratitis

Area of Science:

• Ophthalmology
• Veterinary Entomology

Background:

• Ocular myiasis is a condition where fly larvae infest the eye.
• Oestrus ovis, the sheep bot fly, is a common cause of myiasis in animals and occasionally humans.

Observation:

• A 35-year-old male presented with acute symptoms of right eye irritation, redness, swelling, and watering.
• Examination revealed conjunctival injection with a pseudomembrane on the upper eyelid, beneath which four motile larvae were found.
• The cornea exhibited a mucous plaque, but the stroma remained clear.

Findings:

• The larvae were successfully removed under topical anesthesia and identified as Oestrus ovis.
• Following removal, the patient's symptoms resolved, and his visual acuity returned to normal (20/20) within three days.

Implications:

• This case highlights the importance of considering Oestrus ovis infestation in patients presenting with acute ocular inflammatory symptoms.
• Prompt diagnosis and removal of larvae are crucial for preventing complications and ensuring a favorable visual outcome.
• Understanding the transmission routes and clinical presentation of ocular myiasis is essential for ophthalmologists and public health professionals.