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Normally images will be focussed clearly on the retina at the back of the eye. However if the lens in the eye is too thin or the eye is too short the focal point for the eye is too long. This is where the term ‘long-sightedness’ comes from. You may also hear the term hypermetropia used which is the same thing. It means that things in the distance will not be very sharp and things up close will be even more out of focus.