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Prevalence of anterior and posterior astigmatism patterns and their influence in the amount of the total corneal astigmatism by ray tracing

Session Details

Session Title: Cataract I

Session Date/Time: Friday 14/02/2014 | 10:30-12:30

Paper Time: 11:16

Venue: Kosovel Hall (Level -2)

First Author: : Carlos G.Arce BRAZIL

Co Author(s): :    Sathish Srinivasan              

Abstract Details


Study the anterior, posterior and total corneal astigmatism (TCA by ray tracing)


Eye Clinic, Ayr Hospital, Scottland, UK and Private Eye Clinic, Campinas, Brazil


Value and axis of SimK, posterior axial and TCA cylinders were studied in 487 eyes with Galilei


Anterior/posterior cylinder was parallel (1)WTR-69% (2)WTR-5% (3)oblique-4% and crossed (4)ATR/WTR-13% (5)WTR/ATR-0% (6)oblique-0.2% (7)WTR/oblique-1% (8)ATR/oblique-5% (9)oblique/ATR-2.5% (10)oblique/ATR-0.5%. More frequent at all ages was type 1. Types 4 and 8 increased with age and was more frequent after 50 years old. TCA was larger than anterior cylinder in types 1(94%) and 3(88%) and smaller in types 2(71%), 8(75%) and 4, 6, 7, 10(100%)


TCA tends to be larger than anterior cylinder if both had parallel axes and smaller if they were crossed. ATR/WTR astigmatism increases with age. We propose calculate Toric IOLs using TCA and SimK average instead of anterior cylinder and fudge factors FINANCIAL INTEREST: ... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented