Long sightedness is caused by a refractive error in the structure of the eye. When the cornea is too flat or the eyeball is too short, incoming light focuses behind the retina rather than directly onto it, resulting in blurred near vision. In some cases, a combination of both factors is responsible. Long sightedness can be present from birth or develop gradually over time, and it often runs in families. A comprehensive assessment at Centre for Sight will determine the precise degree of your long sightedness and the most appropriate treatment.