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Study links post-LASIK/LASEK corneal aberrations and internal aberrations

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SAN FRANCISCO — Increased internal aberrations were associated with corneal aberrations after laser refractive surgery, according to the results of a study presented here.

"As we all know, the eye is subject to a variety of aberrations," Colm McAlinden, MCOptom, said at the American Society of Cataract and Refractive Surgery meeting. "These are described as either low-order or high-order. Laser has been successful in the correction of these aberrations."

The prospective study included 50 patients who underwent LASIK and 50 who underwent LASEK. Corneal and internal aberrations were measured preoperatively and 6 months after surgery. Treatment was limited to eyes that were –1 D to –8 D and had less than 1 D of astigmatism.

Among LASIK patients, results showed statistically significant increases in six corneal Zernike terms and three internal Zernike terms. Significant increases were seen in three corneal Zernike terms and seven internal Zernike terms among patients who had LASEK.

Internal aberrations may result from changes in the posterior corneal surface, changes in crystalline lens movement, such as tilt, or measurement errors, Dr. McAlinden said.