The term "prescription" in eyewear refers to what?

The term "prescription" in the context of eyewear specifically refers to the precise optical measurements needed to create corrective lenses that will properly address an individual's vision needs. This includes a combination of factors such as the sphere, cylinder, and axis for astigmatism, as well as the distance between the pupils (pupillary distance), and any additional specifications like prism correction.

These measurements are critical in determining the appropriate lenses that can effectively correct refractive errors such as nearsightedness, farsightedness, or astigmatism. By having a proper prescription, an optometric technician can provide lenses that ensure the best possible vision correction for the patient. Other options, such as frame style, lens color, and brand, do not pertain to the specific optical parameters necessary to correct vision but instead relate to aesthetic and consumer preference aspects of eyewear.