Rotational stability of a single-piece toric acrylic intraocular lens

PurposeTo assess the rotational stability of a single-piece toric hydrophobic acrylic intraocular lens (IOL) during the first 6 postoperative months.SettingMoorfields Eye Hospital NHS Foundation Trust, London, United Kingdom.DesignProspective case series.MethodEyes with age-related cataract and corneal astigmatism (1.00 to 3.00 D diopter [D]) were measured by partial coherence interferometry (IOLMaster). Preoperatively, the horizontal axis was marked. Surgical technique included a standardized temporal clear corneal incision, phacoemulsification, and in-the-bag implantation of a toric IOL (AcrySof SN60TT). Rotational stability of the IOL was assessed using retroillumination photographs postoperatively at 1 hour and at 1 and 6 months. Uncorrected (UDVA) and corrected distance visual acuities, residual refractive error, and keratometric and refractive cylinders were measured.ResultsThe study enrolled 30 eyes (30 patients). The mean absolute IOL rotation was 2.44 degrees ± 1.84 (SD) at 1 month and 2.66 ± 1.99 degrees at 6 months. The photographic technique had high reproducibility of axis measurement, with consecutive measurements varying by less than 2.0 degrees. The mean UDVA was 0.16 logMAR (range 0.42 to −0.18 logMAR) at 1 month and 0.20 logMAR (range 0.60 to −0.20 logMAR) at 6 months. The residual refractive cylinder by autorefraction was −0.84 D (range −2.00 to 0.00 D) and −0.80 D (range −1.75 to 0.00 D), respectively.ConclusionsThe acrylic toric IOL was rotationally stable within the first 6 months postoperatively. The photographic and axis analysis method to evaluate stability had high reproducibility and detected small changes in rotation.Financial DisclosureNo author has a financial or proprietary interest in any material or method mentioned.