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First Author: P.Jeppesen DENMARK
Co Author(s): A. Surland T. Olsen
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To compare the residual subjective cylinder after implantation of different toric IOls and the predictability of the residual refractive cylinder in 123 consecutive patients
Department of Ophthalmology, Aarhus University Hospital, Denmark
All patients operated with a monofokal toric IOL at our department in 2012 were included in the study. Patients had either cataract or had a clear lens exchange due to refractive disturbances. Three different types of toric IOLs (AMO ZCT, Alcon SN6AT or AT Torbi from Zeiss) were used in order to correct the corneal astigmatism. The axis of position of the toric component was registered during the operation and postoperatively from 1 week to 8 weeks a IOL photo was taken and the axis of position was measured. AMO ZCT was selected for astigmatisms in the range 0.84 to 4.60 D, Alcon SN6AT in the range from 0.68 D to 4.74 D and AT Torbi from 2.11 D to 7.83 D. The predicted residual postoperative corneal astigmatism was calculated from the preoperative K reading and the cylinder of the implanted IOL adjusted to the corneal plane. One way ANOVA was use to test for difference among expected and measured subjective residual cylinder in patients with the three different types of toric IOLs.
A significant difference was found among the preoperative corneal astigmatism in the three groups, where the patients who received an AT Torbi had signicantly more preoperative corneal astigmatism (p<0.001). A significant difference was found among the difference between the expected and measured postoperative residual refractive cylinder, where AT Torbi had the best predictability of the residual refractive cylinder (p<0.01).
A better predictability of the residual refractive cylinder was found in the patients implantated with the AT Torbi toric IOL than the toric IOLs from Alcon and AMO, which cannot be explained from differences in rotational stability