Scientists have discovered a gene that causes myopia or short-sightedness, a breakthrough which they claim could pave the way for treatment for the most common eye disorder in the world.

Myopia happens when the focal point of an image falls just short of the retina at the rear of the eye, causing blurred-distance vision.

Now, an international team, led by the King's College London, has identified the gene, known as RASGRF1, which plays a key role in the development of the eye and the passing of visual signals to the brain for processing.

And, according to the scientists, within just ten years, a drug that prevents short-sightedness or stops it in its tracks could be in widespread use, making the wearing of glasses negligible, the British media reported.

To find the gene, the scientists compared the DNA of more than 4,000 British twins. They then confirmed their results by studying the genetics of another 13,000 British, Dutch and Australian individuals.

Some 45 per cent of Britons have the rogue gene and those who have two copies of it are almost twice as likely to be short-sighted as those who are free of it.

"We have known for many years that the most important risk factor for being short-sighted is having parents who are short-sighted and for the first time we are identifying genes that may be involved in passing on this susceptibility," said Dr Pirro Hysi, who led the team.

In fact, the scientists found several distinct spellings of DNA code near the RASGRF1 gene that had a strong association with focusing errors.

Team member Prof Terri Young of Duke University in North Carolina, said: "The RASGRF1 provides a novel molecular mechanism to study so that we can work to prevent the most common cause of visual impairment."

The findings have been published in 'Nature Genetics' journal.