Pilot trial for toric correction with light-adjustable lens yields promising early results

Early experience from a pilot study shows that spherocylindrical error after cataract surgerycan be corrected with a proprietary light-adjustable lens (LAL, Calhoun Vision) to improveuncorrected visual acuity, said Arturo S. Chayet, MD.

Dr. Chayet, medical director, Codet Laser Vision Institute, Tijuana, Mexico, presented resultsfrom the first six patients who underwent small-incision surgery and implantation of the lensfollowed by treatment for residual spherocylindrical error. All patients had at least 2 to 3weeks of post-adjustment follow-up.

Mean cylinder prior to adjustment was –1.37 D and it was reduced to a mean of –0.50 D. The meanvectorial cylinder adjustment was –0.87 D.

Post-adjustment UCVA was improved compared with the pre-adjustment level in all eyes and was20/25 or better. No eyes lost BCVA. Topographic evaluations showed no change in the cornealmaps while wavefront aberrometry illustrated the reduction of astigmatism.

"There are many potential advantages of toric adjustment with the [lens]," Dr. Chayet said. "Itoffers a precise method for correcting sphere and cylinder while allowing surgeons to maintaintheir same technique with respect to incision location and IOL placement. In addition, thespatial profile it can be written along with multifocal corrections.

"With available technology, it is possible to correct up to 2.5 D of cylinder at the spectacleplane," he concluded. "The next step will be to refine the nomograms to achieve higher levelsof correction."