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Cylinder power adjustments may yield improved toric IOL outcomes

Arch Ophthalmol. 2011;129(8):998-1003.

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Estimating the effective corneal plane cylinder power after adjusting for anterior chamber depth and IOL sphere power could improve outcomes of toric IOL implantation, according to a study.

The study included 38 eyes of 29 patients who underwent routine cataract surgery and were implanted with an SN60TT AcrySof toric IOL (Alcon).

The corneal plane effective cylinder power of the IOL was calculated after taking into account the effect of anterior chamber depth and pachymetry as well as the implant's sphere power.

The preoperative mean corneal plane equivalent cylinder power of the IOL was predicted by the manufacturer to be 1.58 D, whereas the study authors estimated the value to be 2.02 D. The postoperative mean surgically induced astigmatism was 1.78 D.

"No allowance has been made by Alcon in their product information for the alteration in corneal plane equivalent cylinder power of their toric IOLs as a result of varying sphere power of the IOLs," the study authors said. "Consideration of the likely increase in [anterior chamber depth] and the sphere power of the IOL increases the accuracy of the prediction of this value."