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Intraoperative aberrometry improves refractive outcomes in eyes with previous LASIK

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Eric D. Donnenfeld

Intraoperative wavefront aberrometry can help to limit refractive surprises in eyes that have undergone prior refractive surgery by confirming visual outcomes in the operating room, a speaker said.

"Calculating IOL power in eyes that have previously undergone refractive surgery is imprecise and may result in unplanned postoperative refractive errors," Ocular Surgery News Cornea/External Disease Board Member Eric D. Donnenfeld, MD, said at Hawaiian Eye 2011. "The intraoperative wavefront aberrometer enables measurement of the true refractive power of the cornea."

The ORange wavefront aberrometer (WaveTec Vision Systems), which utilizes Talbot Moiré interferometry to provide a refractive range between –15 D and 25 D and a resolution of less than 0.10 D, can provide both aphakic and pseudophakic IOL calculations and guide both limbal relaxing incisions and the placement of toric IOLs, Dr. Donnenfeld said.

In a retrospective study of 29 eyes that had undergone previous LASIK and received cataract surgery and IOL implantation, mean absolute value prediction using the ORange aberrometer was 0.48 D ± 0.35 D , compared to 0.72 D ± 0.59 D using standard methodology, Dr. Donnenfeld said.

Mean absolute value predictions differed by more than 0.5 D in 24 cases, according to Dr. Donnenfeld.

"The intraoperative wavefront aberrometer is capable of a refraction measurement of the aphakic eye through a post-refractive cornea, which is the only way to achieve the true corneal refractive power," he said. "This is important in post-refractive corneas because the refractive power of the cornea influences the IOL power."

• Disclosure: Dr. Donnenfeld is a consultant for WaveTec Vision Systems.

Hawaiian Eye and Retina 2012 will be held January 15-20 at the Grand Wailea Resort & Spa in Maui. Learn more at OSNHawaiianEye.com or RetinaMeeting.com.