Programm                 "Degeneration und Regeneration– Grundlagen, Diagnostik und Therapie"


Hotelbuchung
   Hotel Registration
Grußwort
   Welcome address
Beteiligte Gesellschaften
   Societies involved
DOG Information
   DOG Information
Eröffnung des Kongresses
   Opening Ceremony
Preise
   Awards
Ablauf der Tagung 2003
   General overview of congress
Lageplan der Räumlichkeiten
   Map of Congress Center
Wissenschaftliche Themen
   Scientific topics
Symposien
   Symposia
Wissenschaftliches Programm
   Scientific program
Posterpräsentationen
   Poster Presentation
Kurse
   Courses
Begleitende Veranstaltungen
   Accompanying program
Arbeitssitzungen
   Working sessions
Rahmenprogramm
   Social program
Allgemeine Informationen
   General Information
Autorenindex
   Index of Authors
Industrieaussteller
   Commercial exhibitors
Sponsoren
   Sponsors
Impressum



DOG Homepage


Abstract
Abstract

Wavefrontanalysis and Contrast Sensitivity after C-Cuts for Corneal Astigmatism

Kaymak H., Kremp K., Mester U.
Augenklinik Sulzbach/Saar

Purpose: Correction of astigmatism with coreal arcuate incisions are safe and efficient procedures to reduce naturally occuring astigmatism as well as surgically induced astigmatism. Though the effects on sphere and cylinder (so called coupling-effect) are well known, changes in wavefront aberrations have not yet been investigated.
Method: 24 patients (age between 23-55 years) with idiopathic corneal astigmatism underwent paired arcuate-keratotomy with the diamond knife. All patients had complete ophthalmologic examination before and 6 weeks after surgery including wavefrontanalysis with Hartmann-Shack Sensor (Zeiss-Meditec) and contrast sensitivity testing with the Functional Acuity Contrast Test (F.A.C.T.) under photopic and mesopic conditions (with Ginsburg-Box).
Results: The mean vector-corrected surgically induced reduction of astigmatism was 2,61(SD 0,99). C-Cuts induced a mean negativ spherical aberration (Z4/0) of 0,09 micrometers and vertical coma of 0,12 micrometer (analyzed pupil diameter: 5mm). Contrast sensitivity was improved significantly under photopic and mesopic conditions with best corrected glasses, though there was a significant increase (+66%) of high-order aberrations.
Conclusions: C-Cuts induced not only spherical and cylindral changes but also high-order aberrations. The improved contrast sensitivity may caused by the induced negative spherical aberration which compensates the change from negativ


Zurück | Back