title: A refined bootstrap method for estimating the Zernike polynomial model order for corneal surfaces.
abstract: Following our previous work on optimal modeling of corneal surfaces with Zernike polynomials, we have developed a refined bootstrap-based procedure which improves the accuracy of the previous method. We show that for normal corneas, the optimal number of Zernike terms usually corresponds to the fourth or fifth radial order expansion of Zernike polynomials. On the other hand, for distorted corneas such as those encountered in keratoconus or in surgically altered cases, the estimated model was found to be up to three radial orders higher than for normal corneas.
authors.affiliation: Contact Lens and Visual Optics Laboratory, School of Optometry, Queensland University of Technology, Victoria Park Rd, Kelvin Grove Q4059, Australia. d.iskander@qut.edu.au
authors.forename: D Robert
authors.initials: DR
authors.lastname: Iskander
authors.forename: Mark R
authors.initials: MR
authors.lastname: Morelande
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Collins
authors.forename: Tobias
authors.initials: T
authors.lastname: Buehren
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D003315:Cornea / Q000503:physiopathology*; D003316:Corneal Diseases / Q000175:diagnosis* / Q000503:physiopathology*; D019781:Corneal Topography / Q000379:methods*; D003936:Diagnosis, Computer-Assisted / Q000379:methods*; D005246:Feedback; D008954:Models, Biological; D009716:Numerical Analysis, Computer-Assisted