ACCURATE DETERMINATION OF EFFECTIVE LENS POSITION AND LENS-CAPSULE DISTANCE WITH 4 INTRAOCULAR LENSES

Purpose: To measure effective lens position(ELP) of 4 intraocular lens es (IOLs) using high precision and high resolution dual-beam partial c oherence interferometry (PCI) and assess the tendency of these IOLs to produce a lens-capsule distance (LCD), a possible risk factor for pos terior capsule opacification. Setting: Department of Ophthalmology, Vi enna General Hospital; institute of Medical Physics, University of Vie nna, Austria. Methods: In a retrospective study, PCI was used to measu re Methods: In a retrospective study, PCI was used to measure ELP and LCD in 139 pseudophakic eyes of 110 patients with 4 IOLs: acrylic 3-pi ece IOL (AcrySof MA60BM); silicone 3-piece IOL without a capsular tens ion ring (PhacoFlex S130); and with a capsular tension ring (PhacoFlex S130 and Morcher Type 14),silicone plate-haptic IOL (Staar AA4203VF); and a hydrogel plate-haptic IOL (logel 1103). Results: The ELF and IC D were determined with a precision of approximately 3 to 4 mu m. An LC D was detected in 21% eyes with the AcrySof, 20% of eyes with the S130 without a capsular tension ring, 10% of eyes with a Capsular tension ring, 21% of eyes with the Staar, and 17% of eyes with the logel. The LCDs detected by PCI, but not by slitlamp examination, were significan tly smaller than those detected by both. Conclusions: The amount of LC D detected by PCI was approximately the same with all IOL types (simil ar to 20%) except the Phacoflex S130 with a capsular tension ring 10%.