Low-power versus medium-power toric intraocular lenses in cataract surgery, about 110 eyes

To analyze the refractive predictability of low-power and medium-power toric intraocular lenses (IOL) during cataract surgery. A retrospective case series. Patients with low and moderate degrees of astigmatism were treated with either an Alcon AcrySof IQ toric monofocal lens (SN6AT2 or SN6AT3) or a Zeiss toric monofocal lens (709 MP + 1 D or 709 MP + 1.5 D). They were divided into two groups: group 1 with low-power toric IOL (n = 40, SN6AT2 and 709 MP + 1), group 2 with medium-power toric IOL (n = 70, SN6AT3 and 709 MP + 1.5 D). Eyes were evaluated before and 1 month after surgery. Uncorrected distance visual acuity (UDVA), corneal and total astigmatism were compared pre- and postoperatively. Vector astigmatism analysis was evaluated using the Alpins method. IOL alignment was checked postoperatively at slit lamp under pupil dilatation and on photos using Eyesuite® software (Luneau®). More than three-quarters of the patients in each group attained a visual acuity of at least 0.1 LogMAR (0.8) without spectacles. The reduction of total astigmatism was significant in the two groups. The residual refractive astigmatism did not differ between the two groups (P = 0.64) and was less than 0.4 D. More than 80% of patients (82.5 vs 84.3%) presented a postoperative refractive spherical equivalent at ±0.50 D (P = 0.8). Vectorial astigmatism was significantly different in the two groups (0.43 D in group 1, vs 0.27 D in group 2; P = 0.03). This is the first study comparing the low- versus medium-power toric IOLs, the most widely used. This study suggests very good refractive results both with low- and medium-power toric IOLs with a single surgical procedure. Évaluer l’efficacité des implants intraoculaires (IOL) toriques de faible et de moyenne puissance dans la correction de l’astigmatisme lors de chirurgie de cataracte. Étude rétrospective de patients présentant des degrés d’astigmatisme faibles et modérés, traités par un implant monofocal torique Alcon Acrysof IQ (SN6AT2 ou SN6AT3) ou un implant monofocal torique Zeiss (709 MP + 1 D ou 709 MP + 1,5 D). Ils ont été divisés en deux groupes: groupe 1 avec un implant torique de faible puissance (n = 40, SN6AT2 et 709 MP + 1 D), groupe 2 avec un implant torique de moyenne puissance (n = 70, SN6AT3 et 709 MP + 1,5 D). Les yeux ont été évalués avant et un mois après la chirurgie. L’acuité visuelle de loin non corrigée (UDVA), l’astigmatisme cornéen et l’astigmatisme total ont été comparés avant et après l’opération. L’analys