Ultrasound Biomicroscopy Comparison ofAb InternoandAb ExternoIntraocular Lens Scleral Fixation

Abstract

Purpose. To compareab internoandab externoscleral fixation of posterior chamber intraocular lenses (PCIOL) using ultrasound biomicroscopy (UBM).Methods. Randomized patients underwentab externoorab internoscleral fixation of a PCIOL. Ultrasound biomicroscopy was performed 3 to 6 months postoperatively, to determine PCIOL centration, IOL distance to the iris at 12, 3, 6, and 9 hours, and haptics placement in relation to the ciliary sulcus.Results. Fifteen patients were enrolled in the study. Theab externotechnique was used in 7 eyes (46.6%) and theab internoin 8 eyes (53.3%). In theab externotechnique, 14 haptics were located: 4 (28.57%) in the ciliary sulcus; 2 (14.28%) anterior to the sulcus; and 8 (57.14%) posterior to the sulcus, 6 in the ciliary body and 2 posterior to the ciliary body. In theab internogroup, 4 haptics (25.0%) were in the ciliary sulcus, 2 (12.50%) anterior to the sulcus, and 10 (75.0%) posterior to the sulcus, 4 in the ciliary body and 6 posterior to the ciliary body.Conclusions.Ab externoandab internoscleral fixation techniques presented similar results in haptic placement.Ab externotechnique presented higher vertical tilt when compared to theab interno.