A person with hypermetropia/hyperopia or long sight can see objects far away from them clearly, but not those close by.

This is caused by the shape of the eye - the eyeball is slightly too short. It is corrected by spectacles or contact lenses with lenses which are 'plus' or convex in shape.

If you're long-sighted your prescription will have a plus lens power, e.g. +2.50D.