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NEW FEMTO CATARACTSession Title: Assessment of Astigmatism
Session Date/Time: Saturday 05/10/2013 | 11:00-12:30
Paper Time: 11:47
Venue: Main Lecture Hall (Ground Floor)
First Author: : S.Ofir ISRAEL
Co Author(s): : A. Abulafia A. Levi O. Reitblat M. Rotenberg G. Kleinmann E. Assia
Purpose:
To assess the accuracy of corneal astigmatism measured by dual-zone automated keratometry, automated keratometry and corneal topography
Setting:
Ein-Tal Eye Center, Tel Aviv, Israel
Methods:
Patient records were reviewed to identify those who had undergone Toric IOL implantation with post-operative Toric IOL axis measurements and post-operative anterior corneal measurements > 1month post-surgery, using the Lenstar LS 900, IOL Master 500 and ATLAS corneal Topographer devices. True net total eye astigmatism was calculated by vector analysis using the post-operative subjective refraction astigmatism and the Toric IOL astigmatic power at the corneal plane. Prediction Error for each device was calculated by subtracting the true net post-operative corneal astigmatic power from the post-operative astigmatic power measured by each device
Results:
Data for 70 eyes was available for analysis. Anterior corneal astigmatism measurements underestimated total corneal astigmatism by 0.57@180 (Lenstar), 0.58@176 (IOL-Master), 0.58@176 (ATLAS SimK) and 0.60@172 (ATLAS MeanK). No clinically significant differences were found between the different measuring devices. However, measurements gained by the Lenstar showed the lowest standard deviation
Conclusions:
Astigmatism measured by dual-zone automated keratometry, automated keratometry and corneal topography showed a similar prediction error pattern. Selecting Toric IOLs based on these devices must take under consideration these consistent measuring errors
Financial Interest:
NONE
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