- A 17-year-old, from Mexico, lost his sight after the parasite invaded his eye
- The worm has been there for three weeks, causing agonising pain
- The boy was operated on and doctors removed the eye’s lens to get to the worm
- But the it had left holes in both his iris and retina, causing permanent damage
- It can be eaten from under-cooked fish but how it got into his eye is a mystery
A horrifying video shows the moment doctors found a worm swimming in a teenage boy’s eye.
The unnamed youngster went into hospital complaining of pain and loss of vision in his right eye.
Eye specialists in the Mexican capital Mexico City examined the 17-year-old and could see a parasite moving in and out of holes it had burrowed into his iris.
The intruder in his eye was a worm that ‘moved freely’ swimming in his intraocular fluid, the watery liquid that fills the chambers of the eye.
It had been there for three weeks, causing agonising pain and severe problems with his sight – and eventually had penetrated his retina.
The parasitic worm can be seen ‘swimming’ in the eyeball of a boy who was left blinded
The ophthalmologists, from the Conde de Valenciana Institute of Ophthalmologym, immediately operated on the patient, removing the eye’s lens to get to the worm.
Then they discovered that the worm had left holes beyond the iris and deep in his retina, causing permanent vision loss.
Located near the optic nerve, the retina, which is the thin layer of tissue that lines the back of the eye, plays a vital role in vision.
Trematodes are flattened oval flatworms, usually no more than a few centimetres in length, although some species are as small as 1 millimetre (stock photo)
The medics successfully removed the worm after cutting it into several pieces. The tiny 3 millimetre parasite was identified as a trematode, a type of flatworm.
Infections can happen in humans and animals after trematodes are ingested from eating under-cooked fish, crustaceans, or vegetation containing their larvae.
They usually infect the gut when they invade humans, therefore the presence of the creature in the boy’s eye baffled doctors.
Dr Guzman-Salas, who examined the boy, said the boy, who is from a rural area of the country, had had ‘very, very bad luck’.