Astigmatismusreduktion durch „Clear-Cornea“-Tunnelinzision bei Phakoemulsifikation mit HKL-Implantation

  • T. Haubrich
  • M. C. Knorz
  • V. Seiberth
  • H. Liesenhoff
Conference paper

Zusammenfassung

Mittels computergestützter Videokeratoskopie wurde die Möglichkeit einer intraoperativen Astigmatismusreduktion durch einen kornealen Tunnelschnitt bei der Kataraktoperation untersucht. Die Astigmatismusänderung der Hornhaut wurde als zweifache Standardabweichung vom Mittelwert der Hornhautbrechkraft für 3 konzentrische Zonen (3 mm, 3–5 mm, 5–7 mm) der Hornhaut bestimmt. 12 Augen von 9 Patienten mit kongenitalem Astigmatismus wurden prä- und postoperativ untersucht und alle 3 Monate nachkontrolliert. Prä- zu postoperativ kam es in der zentralen Zone der Hornhaut zu einer Astigmatismusreduktion von ca. 30%, in der mittleren Zone zu einer nur minimalen Reduktion und in der Hornhautperipherie zu einer Induktion eines irregulären Astigmatismus. In den folgenden 6 Monaten kam es in allen 3 Hornhautzonen zu einer weiteren Astigmatismusreduktion um ca. 10%, anschließend erwiesen sich die Befunde als stabil. Die korneale Tunnelinzision im steilsten Meridian der Hornhaut erwies sich als effektive Methode zur intraoperativen Astigmatismusreduktion.

Summary

We examined the intraoperative reduction of corneal astigmatism performing 5.5-mm clear cornea incision in cataract surgery on 12 eyes with congenital astigmatism using computer-assisted videokeratoscopy. The change of astigmatism was calculated as twice the standard deviation from the mean of the corneal dioptric power. Three concentric corneal zones (3 mm, 3–5 mm, 5–7 mm) were evaluated and examination was performed preoperatively and every three months postoperatively. The astigmatism of the central 3-mm zone was reduced by 30% pre-op to post-op, the 3–5-mm zone revealed a slight reduction of astigmatism and irregular astigmatism was induced in the corneal periphery. Within the following six months astigmatism was reduced by further 10% in each of the corneal zones, later the results proofed to be stable. The clear cornea incision performed in the steepest meridian of the cornea was shown to be an effective method to reduce astigmatism in cataract surgery.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1994

Authors and Affiliations

  • T. Haubrich
  • M. C. Knorz
  • V. Seiberth
  • H. Liesenhoff

There are no affiliations available

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