A man from Xi'an, Shaanxi Province, China, suffered a stroke in the eye after using his smartphone for a long time in the dark before going to sleep.

The man suffered a blockage of the central artery of the retina, where he lost vision in one eye.

Doctors explained that this condition, known as "clot eye" occurs because of clogging or narrowing of the arteries that transport oxygen to the retina.

The man treating the man said the cause of his blindness was probably excessive use of his smartphone, which put excessive pressure on his vision.

But doctors in the United States have questioned the diagnosis, saying a "stroke" usually occurs in older people with heart problems, and said the patient is likely to have migraines in the eye or retinal migraine, a temporary loss of vision due to convulsions. In blood vessels in the retina or behind the eye.

But the patient assured doctors that he had the habit of playing the phone in the dark late at night, and for long periods, and that he was using his right eye most of the time to look at his phone.