Corneal intra-stromal implantation surgery (cisis) for the treatment of keratoconus1Gutsehen Eye Center Ybbs and Department of Ophthalmology, Medical University Innsbruck, Austria
Gutsehen Eye Center Ybbs and Department of Ophthalmology, Medical University Inssbruck, Austria
Purpose — to evaluate the long term results of CISIS for the treatment of Keratoconus.
Methods. CISIS is characterized by the formation of an intra-corneal pocket of 9 mm in diameter at 300 microns depth using the PocketMaker Microkeratome (DIOPTEX GmbH, Austria). After formation of the intra-corneal pocket a flexible continous MyoRing implant (DIOPTEX GmbH, Austria) is inserted into the intra-corneal pocket via a small incission tunnel of about 4 mm width. The nomogram depends exclussively on the average central K-reading. Fifteen eyes of 11 patients with moderate to severe Keratoconus with a mean age of 35 years (range 22 to 60 years) were included into the study. Postoperative Follow-up was 1 year.
Results. The mean average central K-reading decreased by 5.75 Diopters (D) from 48.95 D to 43.20 D. The uncorrected visual acuity (UCVA) improved by almost 10 lines from 0.07 to 0.56 after 1 year. The best spectacle corrected visual acuity improved by almost 3 lines from 0.42 to 0.77. Mean sphere reduced from –5.13 D to 0.1 D and mean cylinder from –3.5 D to –1.27 D. No relevant intra — or postoperative complication occured. Side effects include glare and night-vision problems in some patients.
Conclusion. Treatment of Keratoconus using the PocketMaker Microkeratome and the MyoRing intracorneal implant is safe and effective.
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