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J Garcia-Feijoo, J Hernández-Matamoros, C Méndez-Hernández, A Castillo-Gómez, A Fernandez Vidal, C Lazaro, J García-Sánchez; Ultrasound Biomicroscopy Examination of Silicon Posterior Chamber Phakic Intraocular Lens for Myopia . Invest. Ophthalmol. Vis. Sci. 2002;43(13):449.
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Purpose: To study the intraocular position and the anatomic relationships of PRL-III (Phakic Refractive Lens) posterior chamber phakic intraocular lens (PCPIOL) for myopia using ultrasound biomicroscopy. Methods:The UBM 840 (Zeiss-Humphrey, 50 MHz) was used to examine 18 phakic myopic eyes of 10 patients (8 women and 2 men; mean age: 26,8 SD 2,3) that had undergone silicone PCPIOL implantation (PRL model 101, Medennium Inc, Irvine, CA, USA). The examinations were performed under standard illumination and accommodation conditions by the same examiner. Hourly radial and transversal sections were taken, thus providing 360º coverage of the anterior chamber and a section of the anterior chamber through the corneal apex and centered in the pupil was performed. PRL position was determine and central distance between the corneal endothelium and the PRL was measured. PRL-crystalline lens peripheral distance was only measured in the minor axis of PRL edge as silicone produces numerous artifacts which lead to erroneous measurements. We also determined the PRL- iris contact area. Results: In our series 8 eyes had both haptics in zonule and 5 eyes had both in the ciliary sulcus and 1 had both impacted in the ciliary body. The 4 remaining eyes had mixed positions (table 2). We observed that the PRL axis remained in the horizontal meridian (± 10º) in 12 eyes (50%), it rotated 90±10 º in 3 eyes, and 45±10 º in 3 eyes. The mean PRL - endothelium distance was 2137,7 SD 511,2 µm, mean PRL crystalline lens peripheral distance was 622,3 SD 241,4 µm. The mean PRL-iris contact in the mayor axis was 1802,7 SD 1191,6 µm. Conclusion: The PRL implantation is a safe technique in the short term. However, the sulcus location of the haptics in many cases and the PRL-iris contact suggest caution regarding the long term and make us consider that it would be advisable to have lens of different diameters available or perhaps to perform small changes in their design.
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