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Intraoperative aberrometry outperforms preop toric calculator
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SAN DIEGO — The use of intraoperative aberrometry reduced postoperative astigmatism significantly more than use of a preoperative toric calculator in eyes undergoing femtosecond laser-assisted cataract surgery, according to a study presented here.
“The number of subjects falling outside the intended target was reduced by more than half using aberrometry. Intraoperative aberrometry provides significantly more accurate toric lens guidance in terms of power and axis than the preoperative toric calculator,” Robert J. Cionni, MD, said at the American Society of Cataract and Refractive Surgery meeting.
Robert J. Cionni
“IOL power, including the toricity, is typically calculated using formulas based on the length of the eye, the theoretical location of the implant and the anterior corneal curvature for power,” Cionni said. “Toric IOLs are designed to treat both aphakia and astigmatism, requiring implantation along a specific axis.”
The randomized, prospective, contralateral eye study included 111 eyes that underwent intraoperative aberrometry with the ORA system with VerifEye (Alcon) or preoperative measurement with a toric calculator.
At 1 month after surgery, 89.2% of eyes in the aberrometry group and 76.7% of eyes in the toric calculator group had astigmatism of 0.5 D or less; the between-group difference was statistically significant (P = .006).
Mean overall postop astigmatism was significantly lower in the aberrometry group than in the toric calculator group.
The power was changed in 61 eyes (55%); change was one toric magnitude in 40 eyes, two magnitudes in 19 eyes, three magnitudes in one eye and four magnitudes in one eye, Cionni said. – by Matt Hasson
Disclosure: Cionni reports he is a consultant for Alcon.