SS-OCT BIOMETERS USING THE SUM-OF-SEGMENTS METHOD VERSUS USING THE MEAN GROUP REFRACTIVE INDEX TO MEASURE AXIAL LENGTH – HOW DOES IT AFFECT IOL POWER CALCULATIONS?
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SS-OCT BIOMETERS USING THE SUM-OF-SEGMENTS METHOD VERSUS USING THE MEAN GROUP REFRACTIVE INDEX TO MEASURE AXIAL LENGTH – HOW DOES IT AFFECT IOL POWER CALCULATIONS?
- Author:
H. JOHN SHAMMAS, ROBERT F, MELENDEZ, ANDREA PETZNICK
The differences in axial length measurement between the two methods are statistically significant and most noticeable in long and short eyes. Axial length determined with the Mean Group Refractive Index is slightly shorter in short eyes and longer in long eyes. Depending on the length of the eye, some newer IOL power calculation formulas may provide better outcomes with the Sum-of-Segment method.
