South Korean doctors remove 11 parasitic worms from patient’s eyes ahead of cataract surgery

Discovery during cataract evaluation

A 71-year-old farmer in South Korea visited Kangwon National University Hospital for a routine evaluation ahead of cataract surgery. Doctors discovered 11 live parasitic worms in his eyes, identified as Thelazia callipaeda. This species typically infects animals such as dogs and cats but rarely affects humans.

According to reports, the worms ranged from 11 to 20 millimeters in length. Some female worms were pregnant and had already released fertilized eggs, with a few hatching into larvae. The discovery was unexpected, as humans are usually a dead-end host for this parasite, meaning infections rarely persist or spread.

Removal and recovery

Ji Eun Song, an ophthalmologist at Kangwon National University Hospital, and Kyuseong Jo removed the worms using fine forceps after administering topical anesthesia. The procedure was successful, and the patient showed no further symptoms or signs of recurrence during five months of follow-up.

The patient is now scheduled to undergo cataract surgery as originally planned next month. The case underscores the importance of investigating unusual findings, even in routine medical evaluations.

How the infection occurs

Thelazia callipaeda worms are transmitted by face flies, which feed on tears and eye-related fluids of animals. Humans can become accidental hosts through contact with infected flies, though sustained infections are rare. This case is notable for the number of worms and their reproductive maturity.

What this means

Lazyfounder analysis — our interpretation, not reported fact.

For healthcare operators, this case is a reminder that even routine procedures like cataract surgery can uncover unexpected conditions. It highlights the value of thorough pre-operative assessments, particularly in regions where zoonotic infections may occur. Founders developing diagnostic or telemedicine tools for ocular health may also find this case relevant, as it underscores the need for solutions that can identify atypical symptoms early.

Key takeaways

• Rare ocular infections like Thelazia callipaeda can mimic or complicate common conditions such as cataracts, emphasizing the need for thorough pre-surgical evaluations.
• Persisting or unusual ocular symptoms—even in routine cases—may require deeper investigation to rule out atypical causes.

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