58 | EYEWORLD | JUNE 2019
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that differed from the preoperative IOL power
calculation (n=913) showed a difference of 0.19
(P<.0001) between intraoperative aberrometry
and the preop formula calculation. The absolute
median error in cases in which the IA recom-
mendation differed from the preoperative IOL
power calculation (n=913) showed a difference
of 0.21 (P<.0001)," he said. In these cases, the
percentage of eye with an absolute prediction
error ≤0.50 D was 86.7% for IA compared to
59.6% had the preop calculated IOL power
been implanted.
Additional analyses are needed to deter-
mine whether the level of experience of a sur-
geon influences the results. Dr. Breen thinks the
differences may be even more pronounced for
more experienced surgeons or when using more
advanced power calculation formulas, which
might narrow the gap.
error can be misleading sometimes because they
look like they are very small differences. But
they result in a big difference in the eyes that
end up within a half diopter of predicted post-
operative spherical equivalent," he said.
The difference in mean absolute value of
the prediction error was 0.12 between intraop-
erative aberrometry and preoperative formu-
la-calculated value (P<.0001). The difference
in the absolute median error was also 0.12. As
far as the percentage of eyes with a prediction
error ≤0.50 D, in the completed data set the IA
percentage was 82.4% while the preop calcula-
tion would have resulted in 68.3%.
"In those cases where the aberrome-
try recommendation was different from the
preoperative plan, the differences were more
pronounced," he explained. "The mean ab-
solute value of the prediction error for cases
in which the IA recommended an IOL power
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continued from page 56
Financial interests
Breen: Alcon
Contact
information
Breen:
michael.breen@alcon.com
