In an eye prescription, the term "plano" refers to the SPH section of the prescription and means that no spherical correction is needed for that eye. Plano lenses are ophthalmic lenses that do not have any power and do not help correct vision. They are simply optical lenses that provide no corrective power. If you see the term "plano," "PL," or "0.00" in the SPH section of your prescription, it means you do not require nearsighted or farsighted correction. Plano lenses are often used as protective equipment or safety spectacles designed to protect against eye injuries caused by flying dust, metal, wood chips, and other particles. They can also be used for fashion purposes or as computer glasses with blue light blocking.