title: Evaluation of optical quality of corneas using corneal topographers.
abstract: OBJECTIVE
  To review the evaluation of the optical quality of the cornea by corneal topography.
  
  
  RESULTS
  Color-coded maps show qualitatively the characteristics and severity of irregular astigmatism at the entrance pupil. Topographic indices such as the surface regularity index and predicted corneal acuity are derived from computation of the corneal power distribution, and they are highly correlated with high-contrast visual acuity. Fourier analysis can be used to represent the irregular and regular astigmatism components simultaneously. Zernike polynomials can be used to calculate higher-order wavefront aberrations due to the corneal surface.
  
  
  CONCLUSIONS
  Evaluation of the optical properties of the cornea using a corneal topographer is useful for assessing quality of vision.
authors.affiliation: Department of Ophthalmology, Jichi Medical School, Tochigi, Japan. nmaeda@ophthal.med.osaka-u.ac.jp
authors.forename: Naoyuki
authors.initials: N
authors.lastname: Maeda
mesh_terms: D001251:Astigmatism / Q000175:diagnosis*; D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography; D005583:Fourier Analysis; D006801:Humans; D012029:Refraction, Ocular; D014792:Visual Acuity