What do eye prescriptions mean and how do they determine the correct lenses for vision correction?

Eye prescriptions indicate the specific corrective lenses needed to improve vision. They include measurements for nearsightedness, farsightedness, and astigmatism. Optometrists determine the correct lenses by conducting a comprehensive eye exam, which includes tests to assess visual acuity and refractive errors. Based on the results, they prescribe lenses that compensate for the specific vision issues identified during the exam.