A grim video has emerged of a doctor removing 20 live worms from a man's eye.

The 60-year-old patient, known by the surname Wan, said he first felt the sensation of a foreign body in his eyes a couple of months ago but he thought the condition was caused by tiredness and did not treat it at that moment.

Mr Wan, from the city of Suzhou in eastern China's Jiangsu province, started to feel increasing pain in the eye and was admitted to the Suzhou Municipal Hospital for a thorough medical examination.

Dr Xi Ting then identified a cluster of tiny worms stuck under Mr Wan's right eyelid.

Dr Xi removed at least 20 worms from the man's eye
Dr Xi removed at least 20 worms from the man's eye

Video taken by the medical staff shows Dr Xi pulling a long, wriggly worm from the patient's eyelid and placing it in a clear container.

He subsequently removes at least 20 white slender roundworms, also known as nematodes.

The worms are commonly known as parasites living in the conjunctival sac and tear ducts of dogs, cats and other animals.

It takes about 15 to 20 days for the larvae to develop as worms, according to Dr Xi.

The parasitic worms can be transferred to human from living animals
The parasitic worms can be transferred to human from living animals

While Mr Wan claimed he doesn't have any pets at home, he admitted that he exercised outdoors regularly and might have come into contact with animals some times.

The doctor reminded animal owners to be careful of pet hygiene as parasites such as nematodes can be transferred to people.

He also advised patients experiencing symptoms such as blurred vision or discomfort to seek medical attention.

Last year, a dog owner has to undergo surgery to remove three worms from his eye.

And a doctor had to remove dozens of paper scraps from a young girl's eye after bullies forced to shove it in.