title: Transformation of Zernike coefficients: scaled, translated, and rotated wavefronts with circular and elliptical pupils.
abstract: Zernike polynomials and their associated coefficients are commonly used to quantify the wavefront aberrations of the eye. When the aberrations of different eyes, pupil sizes, or corrections are compared or averaged, it is important that the Zernike coefficients have been calculated for the correct size, position, orientation, and shape of the pupil. We present the first complete theory to transform Zernike coefficients analytically with regard to concentric scaling, translation of pupil center, and rotation. The transformations are described both for circular and elliptical pupils. The algorithm has been implemented in MATLAB, for which the code is given in an appendix.
authors.affiliation: Biomedical and X-ray Physics, Royal Institute of Technology, Stockholm, Sweden. linda@biox.kth.se
authors.forename: Linda
authors.initials: L
authors.lastname: Lundström
authors.forename: Peter
authors.initials: P
authors.lastname: Unsbo
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D019781:Corneal Topography / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D007498:Iris / Q000502:physiology*; D008954:Models, Biological; D015203:Reproducibility of Results; D012399:Rotation; D012680:Sensitivity and Specificity; D014796:Visual Perception / Q000502:physiology*