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New Phakic Posterior Chamber Lens (PRL®) for Refractive Surgery - First Results in Germany
Liekfeld A., Schellenbeck M., Hartmann C.,
Humboldt-Universität zu Berlin, Charité Campus Virchow-Klinikum, Augenklinik (Berlin)
Purpose: Some refractive procedures as PRK or LASIK are limited by factors like high myopia, hyperopia, or thin cornea. For these cases phakic intraocular lenses exist. Currently available models show fairly often complications. Therefore there has been developed a new phakic posterior chamber lens, that seems to have a considerably lower complication rate according to results outside Germany. Our first results are presented here.
Method: The implanted lens (PRL®, CIBA Vision) is a very thin foldable lens made of highly refractive silicone (refractive index 1.46). The design allows floating of the lens and avoids contact to the natural lens, it is not fixed in the ciliary sulcus. Up to now we have implanted this lens into four highly myopic eyes of three patients (age: 41, 30, 27 years). Three eyes have been amblyopic, preoperative refraction was -13.5 to -21.25 diopters (D), astigmatism was <1.5 D. Anterior chamber depth was <3.0 mm in all eyes, endothelial cell count was <2.000 cells/mm². Postoperative examinations have been over a period of six weeks up to now.
Results: Postoperative refraction was +0.25 to -1.0 D (spherical equivalent), astigmatism did not change. Far visual acuity without correction was 0.6 to 0.8 (preoperative: 1/50 to 0.2), far visual acuity with best correction was 0.7 to 1.0. One patient developed an increase of intraocular pressure up to 30 mmHg one week postoperatively, which was normalized after ending the application of steroid eyedrops (steroid responder). Otherwise there have not been any intra- or postoperative complications.
Conclusions: The PRL® lens seems to be a promising choice for refractive surgery in highly myopic or hyperopic patients. Though our results are only individual observations. Therefore more results, especially longer periods of observation after surgery are necessary.