The most likely way it got there is he rubbed his eye and transferred an egg he picked up touching something.
For example (tho probably not the exact method), some species lay their eggs on the coat of horses, kid pets a horse and picks up an egg, rubs eye and transfers it. It hatches and burrows in and the rest you saw.
I like to think that he got a tapeworm larva that he pooed out and the man did not wash his hands consuming the larva. The larva that can pass the blood brain barrier.
The most likely way it got there is he rubbed his eye and transferred an egg he picked up touching something.
For example (tho probably not the exact method), some species lay their eggs on the coat of horses, kid pets a horse and picks up an egg, rubs eye and transfers it. It hatches and burrows in and the rest you saw.
I like to think that he got a tapeworm larva that he pooed out and the man did not wash his hands consuming the larva. The larva that can pass the blood brain barrier.
But I’m no rocket doctor.