THE KERAVISION® RING FOR CORRECTION OF MODERATE MYOPIA - OUR FIRST RESULTS OF THE REVERSIBILITY OF THIS METHOD
M. Bauer, K. Selde, Th. Neuhann
Background: As one of the most important advantages of the KeraVision® ring for correction of moderate myopia is regarded the possibility of removing the ring if indicated. Upon removal the refraction is expected to return to the preoperative values. We report about the results after explantation of the rings because of postoperative complications.
Patients and Method: 25 Kera-Vision® rings (Kera Vision Inc., Fremont, CA) of PMMA were implanted in the ALZ Augenklinik Munich, between October 1996 and March 1998, for correction of myopia (- 1 to - 5 diopters); most of these patients took part in the European multicentre "Mecca Study". 4 rings had to be removed for various reasons.
Results: All 4 rings could be removed without significant intra- or postoperative complications. Within 3 months all patients returned to about their original manifest refraction spherical equivalent. A decrease of best corrected visual acuity could not be detected. However, biomicroscopically stromal haze and deposits in the ring channel could be observed.
Conclusion: Reversibility of the refractive effect of the KeraVision® ring is given through the option to explant the ring. A complete restitution of the original morphologic state of the cornea seems not to follow explantation according to our observations.
ALZ Agenklinik MÜNCHEN, Ridlerstrasse 75, D-80339 München