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New algorithm optimizes IOL calculations in long, short eyes
CHICAGO — A refined intraoperative aberrometry algorithm improved refractive outcomes in unusually long and short eyes that underwent cataract surgery, a speaker said here.
At the American Academy of Ophthalmology meeting, Eric D. Donnenfeld, MD, described aphakic refraction performed with the ORA System (WaveTec Vision).
Eric D. Donnenfeld
“I’ve never seen anything quite like this in patients having cataract surgery,” Donnenfeld said.
Donnenfeld and colleagues set out to gauge the efficacy of using intraoperative aberrometry to make IOL calculations in long and short eyes.
The retrospective analysis included patients who underwent cataract surgery and implantation of an AcrySof SN60WF IOL (Alcon).
Short eyes were defined as 21.9 mm or less and long eyes were defined as 26 mm or more.
The authors used the ORA with a power calculation algorithm in 119 short eyes and 189 long eyes. They optimized the algorithm in 204 short eyes and 227 long eyes. Regression analysis was used to compare results in the two groups.
Results showed that refraction was within 0.50 D of emmetropia in 62% of short eyes and 79% of long eyes in the preoptimization group, according to Donnenfeld. Mean refractive change was 0.5 D in short eyes and 0.4 D in long eyes.
In the postoptimization group, refraction was within 0.5 D of emmetropia in 73% of short eyes and 81% of long eyes. Refraction was within 0.75 D of emmetropia in 93% of short eyes and 94% of long eyes, Donnenfeld said.
Disclosure: Donnenfeld is a consultant for Alcon and Wavetec Vision.