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Impressum
Reduction of decentration after LASIK using a modified eye tracker ring for the MEL-70 Excimer Laser
Sekundo W., Nietgen G.
Medizinisches Zentrum für Augenheilkunde der Philipps-Universität, 35037 Marburg
Background: Aim of this study was to determine and compare the
rate of excentric laser ablatio after LASIK depending on the used eye
tracker ring.
Methods: All LASIK treatments were carried out using the MEL-70
flying spot excimer laser (Aesculap-Meditec, Jena). The flap was produced
using a Corneal Shaper™ or Hansatome™ - Microkeratom (B &
L Surgical, Heidelberg). Initially we used a 11 mm eye tracker ring without
hinge protection. At the end of February 2001 this ring was replaced by
a 10 mm and a 9.5 mm ring with built-in hinge protection. An additional
modification was introduced by us: in 1 mm distances little teeth-like
spikes were engraved into the eyeward side of the ring, thus stabilizing
the position of the ring on the globe and allowing free liquid to flow
through the spaces between each spike. Corneal topography (TMS 3, Tomei,
Erlangen) from patients with a follow-up of one month or longer was carried
out and the calibration and biometry system allowed us to determine decentric
ablation from the fixation point.
Results: In group I patients (old ring) 42 eyes were treated. In
25 eyes ablation was present ranging from 0.0 to 0.5 mm, in 11 eyes range
was 0.51 to 1.0 mm and in 5 eyes range was 1.1 to 1.5 mm, whereas one
eye showed decentric ablation of 1.53 mm. In group II (new ring) 35 eyes
were investigated. In 30 eyes ablation was within 0.5 mm, 4 eyes had decentric
ablation of 0.51 to 1.0 mm and one eye had a decentric ablation of 1.28
mm from the fixation point.
Discussion: The further development of our eye tracker ring of
the MEL-70 laser considerably reduced the rate of decentric ablation.
An enhanced grip of of the ring onto the globe reduces a slow slide during
the laser procedure. inges verringert durch das unauffällige Gleiten
während der Laserbehandlung entstehende Dezentrierungen.