الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
With success rate over 98%, expectations and demands of patients suffering from cataract increased over the last 20 years, and now patients require correction of refractive errors after cataract surgery as well. In addition to spherical refractive errors, astigmatism should be addressed at the time of surgery to achieve the best post-surgery refractive outcomes.(16)
The prevalence of corneal astigmatism more than 1.5 diopters (D) ranges between 15% and 29% as reported by different studies.(17-20) In a general cataract population, approximately 10% of patients have astigmatism greater than 2 D, 20% have between 1 and 2 D, and 70% have less than 1 D.(16, 21-23)
The Alcon AcrySof IQ Toric IOL (Alcon) is a premium IOL that can be used to correct spherical as well as cylindrical refractive errors. It features an almost immediate interaction of the IOL biomaterial with the posterior capsule owing to its adhesive properties providing exceptional long-term rotational stability.(53)
The LENSTAR® LS 900 biometer (Haag-Streit AG, Koeniz, Switzerland) is a newly developed biometry device that can measure central corneal thickness (CCT), anterior chamber depth (ACD; from corneal endothelium to lens surface), lens thickness (LT) and axial length (AL), in addition to keratometric (K) readings, corneal diameter (CD), pupil size, eccentricity of the visual optical line and retinal thickness at the macula.(55)
Lenstar features dual-zone keratometry or T-Cone topography for precise astigmatism and axis measurement. The integrated Barrett Toric Calculator predicts toric IOL, taking into account the posterior cornea for best refractive outcomes.(58)
The VERION Image Guided System (Alcon, Fort Worth, Texas) represents an integrated approach developed to help improving the quality of refractive outcomes by streamlining the process of measurement, calculation, and implantation with the single goal of reducing variability.(53)
The aim of the current work was to compare and assess the accuracy of both lenstar T-cone toric platform and VERION platform in toric IOL power calculation as regarding postoperative refraction.