Artikel
Corneal radii and anterior chamber depth in comparison IOL Master/Orbscan II
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Autoren
Veröffentlicht: | 22. September 2004 |
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Gliederung
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Objective
Corneal radii and anterior chamber depth (ACD) are important values for IOL calculations. This study is to test these values in IOL Master vs. Orbscan.
Methods
In a prospective study we evaluated 189 eyes of 98 patients (median 38 y., 95% CI 18 to 62y.). Corneal radii and ACD were measured using IOL Master (Carl Zeiss) and Orbscan II (Bausch & Lomb). The Orbscan sim K-reading was transformed into corneal radi using n=1,3375. Statistics was was performed using the paired Wilcoxon test.
Results
Orbscan measured significantly greater corneal radii (p<0,0001). Using the IOL Master, corneal radii (median) were R1=7,82 mm and R2=7,59 mm. Using the Orbscan, corneal radii (median) were R1=7,90mm and R2= 7,67mm. IOL Master measured significantly greater ACD (p=0,0003). ACD (median, measured from epithelium) using IOL Master was 3,64mm and using Orbscan was 3,60mm.
Conclusions
Orbscan II measures significantly greater corneal radii, equalling 0,5 dpt of keratometric power. IOL Master measures singificantly greater ACDs, but the average difference of 0,04mm has no clinical significance.