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Relevance of the posterior corneal surface for detection of early keratoconus and post‐LASIK keratectasia
Author(s) -
Wylegala E.
Publication year - 2016
Publication title -
acta ophthalmologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.534
H-Index - 87
eISSN - 1755-3768
pISSN - 1755-375X
DOI - 10.1111/j.1755-3768.2016.0235
Subject(s) - keratoconus , zernike polynomials , corneal topography , lasik , ophthalmology , curvature , medicine , optics , optometry , computer science , mathematics , cornea , physics , wavefront , geometry
Summary We present different display techniques for the anterior and posterior corneal surface such as axial or tangential power map, pachymetry map, height or enhanced height map or results of mathematical decomposition techniques such as Fourier or Zernike maps. We discuss the advantage and drawbacks of those maps for detection and evaluation of keratoconus severity. The variety of the output maps of different instruments such as the Orbscan IIz or TMS‐5, the Pentacam and the Casia‐1000 are shown and discussed in detail. Additional information of new parameters such as ratio of anterior to posterior surface curvature are introduced and the diagnostic value for evaluation of early forms of keratoconus will be tailored‐out.