In an eyeglass prescription, “pl” usually stands for “plano.” Plano describes a lens that has no refractive power, meaning it is used for individuals who do not need any vision correction in that particular eye. This is often indicated in prescriptions for people who may only need correction in one eye, while the other eye has normal vision.
For example, if you see “OD: -2.00 pl,” it means that the right eye (OD, which stands for “oculus dexter”) requires a -2.00 diopter lens for nearsightedness, while the left eye (OS, or “oculus sinister”) is plano, indicating it doesn’t require any correction.
In summary, “pl” in an eyeglass prescription indicates that the eye does not require corrective lenses.