To understand what non-prescription glasses are, it may be beneficial to first define what prescription glasses are, so we can clearly see the difference between the two.

Prescription glasses are optical glasses that contain a powered lens. This power or prescription, is determined by an optometrist during an eye test, and will help correct a vision issue such as nearsightedness.

Non-prescription glasses are the opposite. Non-prescription glasses do not have any magnification power or prescription in the lens. The lenses in non-prescription glasses are sometimes referred to as plano lenses and will not provide any vision correction.