Near-sightedness proved to be hereditary

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Research conducted by the Erasmus Medical Centre in Rotterdam shows that near-sightedness is passed on by parents to their children. The research has revealed which chromosomes are responsible for this hereditary trait. People with a genetic variant on chromosome 15 have a higher chance of being short-sighted. The chromosomes of 15,000 people were examined for the research. Environmental factors also play a role in near-sightedness. Much reading at a young age and little outdoor-activity appear to aggravate the condition, which is the main cause of blindness in middle age.  Near-sightedness is caused by an excessive lengthwise growth of the eyeball. As a result, the focal point of light rays entering the eye is located just in front of the retina instead of on it, resulting in a blurred image.     ©  

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