ABSTRACT NUMBER - S2005

5. ACCURACY OF TOTAL CORNEAL TOPOGRAPHIC ASTIGMATISM (CORT TOTAL) COMPARED TO THE TOTAL CORNEAL POWER MEASURED USING 3 DIFFERENT YOMOGRAPHERS


Noel Alpins AM1,2, Bradley Randleman3, Anita Neyvas-Wallce4, James Ong5, George Stamatelatos2

Meeting:  2018 RANZCO


Purpose: To compare the ocular residual astigma- tism (ORA) using total corneal topographic astigma- tism (CorT Total) to total corneal power measured from the Ziemer Galilei, CSO Sirius and Oculus Pentacam tomographers.
Method: The CorT parameter (CorT Total) is calcu- lated using all the data captured during tomography, including posterior cornea. The CorT Total was then compared to the total corneal powers generated from the Galilei, the Sirius and Pentacam tomographers using the spread of the ocular residual astigmatism (ORAsd), which quantifies corneo-refractive differ- ences. A low ORAsd indicates a low variability between corneal astigmatism and refractive cylinder. A low mean of the ORA magnitude indicates a close correlation of refractive and corneal astigmatism magnitudes.
Results: The mean ORA magnitude for the CorT Total measured by the Sirius (n = 606), the Galilei (n = 190) and the Pentacam (n = 157) was 0.51D, 0.66D and 0.64D respectively. The ORAsd for the CorT Total for the Sirius, the Galilei and the Penta- cam was 0.32D, 0.47D and 0.34D. The mean ORA magnitude for the total corneal power measured by the Sirius, the Galilei and the Pentacam was 0.53D, 0.63D and 0.63D respectively. The ORAsd for the total corneal power measured by the Sirius, the Galilei and the Pentacam was 0.32D, 0.54D and 0.34D.
Conclusion: The CorT Total is comparable to the total corneal powers measured by the Galilei, Sir- ius and Pentacam tomographers. The CorT Total can be used across different tomographers as an accurate measure and benchmark of total corneal astigmatism when planning toric IOL and corneal surgery.

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