An apparatus and method for selecting a lens that accounts for Decentration and/or Rotation Errors. The method includes obtaining results of a first wavefront exam on a patient, including a wavefront map and Zernike polynomials, selecting a first lens that improves vision, obtaining the results of a second wavefront exam including a wavefront map and Zernike polynomials, calculating the Decentration and/or Rotation Errors of the selected lens by calculating a difference between the Zernike polynomails, and selecting a second lens that better corrects accounts for the calculated Decentration and/or Rotation Errors.一種用於選擇有考量偏心誤差及/或旋轉誤差之一鏡片之設備及方法。該方法包括：獲得對一患者的第一波前檢查之結果，該等結果包括一波前圖及任尼克多項式；選擇改善視力的一第一鏡片；獲得一第二波前檢查之結果，該等結果包括一波前圖及任尼克多項式；藉由計算該等任尼克多項式之間的一差值來計算所選擇的該鏡片之偏心誤差及/或旋轉誤差；及選擇較佳矯正/考量該所計算偏心誤差及/或旋轉誤差的一第二鏡片。
