Long and short-sightedness

Some people are long sighted, some short sighted, in fact most people have a little prescription even if it does not need to be corrected.  Find out about spectacle lenses used to correct vision

This picture shows a long sighted eye.  In the sight test result the SPH is indicated as positive (+).The light entering the eye does not focus on the back of the eye, but at an imaginary point behind the eye.  Sometimes in young people the eye lens can compensate for this.  With vision like this spectacles / contact lenses are normally required