Single vision lenses have the same prescription throughout their entire surface. They can correct either distance or near vision.
Reading glasses provide near vision correction in strengths ranging from +0.75 to +3.50. They are available with or without prescription.
Non-prescription lenses are clear or tinted lenses, made available to those who do not require vision correction.
Multifocal lenses (progressive, degressive or anti-fatigue) contain two or more prescriptions, at once providing correction for various distances.