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Sanjeev Kasthurirangan, Don Nixon, Lucas Feuchter, Pamela Smith; Rotational stability of a hydrophobic-acrylic aspheric toric intraocular lens. Invest. Ophthalmol. Vis. Sci. 2013;54(15):1829.
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To evaluate the rotational stability of the TECNIS® Toric intraocular lens (IOL).
Prospective, open-label, clinical study of the TECNIS® Toric IOL. The 4 toric IOL models used in this study were ZCT150, ZCT225, ZCT300, and ZCT400, that together cover the range of corneal astigmatism from 0.75 and 3.62 diopters (D). Patients with keratometric cylinder within that range of astigmatism and scheduled for normal cataract surgery who had no ocular or systemic pathologies other than cataract were enrolled into the study. All eyes underwent standard small incision phacoemulsification surgery followed by implantation and alignment of the appropriate model of TECNIS® Toric IOL. High-resolution, slit-lamp retroillumination, digital photographs were taken at 1 day, 1 week, and 1, 3, and 6 months postoperatively. Axis alignment was assessed using the AMO TECNIS® Toric Lens Axis Measurement Program. Digital photographs at each postoperative visit were compared with the baseline (1 day) image to determine amount and direction of IOL rotation. Data are included for all eyes with evaluable images at 2 or more visits.
The mean age of toric subjects (n=174) was 69.4 ± 8.0 (range 41 to 87) years and 54.6% (95/174) of toric subjects were female. Mean absolute change in axis orientation between visits was less than 3° for all visit intervals. The mean absolute change in lens axis across the lens models was similar. Between the 1- and 3-month visits, 92.9% (145/156) of lenses rotated ≤ 5°; 94.1% (143/152) of lenses rotated ≤5° between the 3 and 6 month visits; and 94.2% (147/156) of lenses rotated ≤5° between the 1 day and 6 month visit. Four of 174 lenses (2.3%) required repositioning, all in the early postoperative period.
The TECNIS® Toric IOL exceeded the ANSI standard for rotational stability of a toric IOL, demonstrating sound rotational stability.
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