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J. Garcia-Feijoo, C. Mendez-Hernandez, S. Duran, M. Cintrano, A. Castillo-Gomez, A. Fernandez-Vidal, M. Zato, J. Garcia-Sanchez; Ultrasound Biomicroscopy Examination of ATR-45 Pseudoacommodative Intraocular Lenses . Invest. Ophthalmol. Vis. Sci. 2003;44(13):265.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To study the intraocular position, anatomic relationships and the behaviour of the Cristalens model AT-45 intraocular lens in the posterior chamber using ultrasound biomicroscopy. Methods: The UBM 840 (Zeiss-Humphrey, 50 MHz) was used to examine, six weeks after surgery, 10 eyes of 10 consecutive patients (8 women and 2 men; mean age: 63,7 SD 2,3) who underwent ATR-45 implantation (C&C Vision, Aliso Viejo, CA). Crystalens is a modified silicone haptic plate lens, with small looped polyamide haptics hinged adjacent to the optic to fixate firmly in the capsular bag. The lens is designed to move forward and backwards along the visual axis upon ciliary muscle contraction. UBM procedure: Every eye was examined twice by the same examiner under constant luminance conditions. Hourly radial and transversal sections were taken, thus providing 360º coverage of the anterior chamber, and a central section of the anterior chamber through the corneal apex and centered in the pupil was performed. IOL position was determined and ACD (corneal endothelium to IOL anterior surface) was measured. During first examination the ACD was determined after the instilation of pilocarpine, and 72 hours later the ACD was measured after the instilation of a cicloplegic agent. Results: All eyes had the IOL correctly placed in the capsular bag. Mean ACD after the pilocarpine instilation was 4225,8 SD 412,17 µm (range: 3856-5133), and mean ACD after ciclopegic was 4240,1 SD 424,84 µm (range: 3833-5155). No statistical differences were found. Only in two eyes the ACD was found to change between the two UBM examinations (152µm and 187µm). Conclusions: The range of movements observed with UBM for the ATR 45 lens in this short series does not justify itself the possible near vision improvement in these patients. Further work is needed to confirm these findings.
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