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Correction of Hyperopia using the PermaVisionÒ Intracorneal lens 6-12 Months Results
Jendritza B., Knorz M. C.,
Ruprecht-Karls-Universität Heidelberg, FreeVis LASIK Zentrum (Mannheim)
The objective of this study is to evaluate the safety and effectiveness of the PermaVisionÒ intracorneal lens when used as a new technique for the correction of low to moderate hyperopia (+1.0 to +6.0 D) with astigmatism £ 1 D.
Methods: Till April 2002 18 eyes (9 patients ) have been enrolled in this prospective, multicenter ERB approved study. After cutting a corneal flap using the hansatome (Bausch und Lomb Surgical) or amdeus (Allergan Surgical), the PermaVisionÒ lens was placed in the center of the exposed bed centered over the pupil. The flap was then laid back onto the eye. The following clinical parameters were evaluated pre- and postoperatively: uncorrected and bestcorrected distance and near visual acuity, cycloplegic refraction, contrast sensitivity, corneal topography and pachymetry, slit lamp and dilated fundus examination.
Results: Preoperative SE was+3.54 ± 1.32 D, 6 months postoperatively +0.30 ± 0.65 D. Uncorrected visual acuity was 20/40 in all cases, 42% of the eyes saw 20/25 or better. 75% were within ± 0.5 D of target refraction. Complications were decentrations (0.5-1 mm:2/18), lipoid like cell aggregation on the lens (6/18) and problems at night (12/18). 2 lenses needed to be explanted due to one of these reasons.
Conclusions: The PermaVisionÒ intracorneal lens is an interesting and promising technique for the correction of low and moderate hyeropia. Further refinement of nomogramms and lens design seem to be necessary according to our results.