Horrified doctors find parasitic worm wriggling inside teenage boy's EYE after he complains of vision loss

octors were horrified when they found a parasitic worm wriggling around inside a teenage boy's eye .

The 17-year-old had reportedly been experiencing pain and 'could barely see' when he sought medical help.

Dr. Pablo Guzman-Salas saw something moving in and out of holes it had burrowed into the boy's iris at the Conde de Valenciana Institute of Ophthalmology in Mexico City.

Guzman-Salas said the teen, from a rural area of Mexico, had had "very, very bad luck".

The intruder in his eye was a parasitic worm that "moved freely" swimming in his intraocular fluid.