Single Vision Lenses What are Single Vision Lenses? Single vision lenses are used in the majority of prescription and reading glasses. For nearsightedness, farsightedness, or astigmatism, single vision lenses only accept one prescription. Depending on the sort of prescription they have, some people can use their single vision glasses for both near and far. The centre of single vision lenses for persons who are farsighted is thicker. Nearsighted wearers' single vision lenses h...