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The incidence of topographic abnormalities in patients scheduled for cataract surgery
Session Title: Assessment of Astigmatism
Session Date/Time: Saturday 05/10/2013 | 11:00-12:30
Paper Time: 11:00
Venue: Main Lecture Hall (Ground Floor)
First Author: : W.Trattler USA
Co Author(s): : R. Correa C. Buznego
To report the incidence of topographic abnormalities before cataract surgery
Private group practice clinic
Consecutive patients scheduled for cataract surgery from October 2012 to February 2013 underwent preoperative evaluation with topography (Nidek Magellan).
120 eyes of 83 patients (55% female) diagnosed with cataract were assessed. Mean age was 70 years old (range 47-98 age). 90% of eyes had no history of any previous corneal surgery. 80% of eyes had BCVA of 20/40 or worse, Slit lamp examination showed normal corneas in 86% of eyes and only 21% of eyes had signs of anterior surface disease (blepharitis and/or tear film insufficiency. Normal/ symmetric bow tie was present in only in 40% of eyes. 13% of eyes had an abnormal I/S index (>1.4). Corneal topography was subjectively classified as being abnormal in 60% of eyes, with findings that included asymmetric bowtie with inferior corneal steepening, asymmetric bowtie with skewed steep axes and central flattening after laser corneal refractive surgery or RK.
Corneal topography was able to detect anterior corneal surface abnormalities in patients scheduled for cataract surgery. These findings are important, as they impact whether patients are appropriate candidates for Presbyopic or toric IOLs, as well as can predict whether a patient who has uncomplicated cataract surgery may still have reduced vision due to abnormal corneal shape.