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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

Purpose:

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

Setting:

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

Methods:

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

Results:

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%)

Conclusions:

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