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Randomized prospective comparison of toric IOL power and axis determination by intraoperative aberrometry vs toric calculator

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Session Details

Session Title: Pseudophakic IOLs: Toric Cataract Surgery Equipment

Session Date/Time: Tuesday 08/09/2015 | 14:00-16:00

Paper Time: 14:40

Venue: Room 1

First Author: : A.Faulkner USA

Co Author(s): :                        

Abstract Details


To compare the accuracy of toric IOL power and axis determination using two methods: intraoperative wavefront aberrometry vs the manufacturer-provided toric IOL calculator.


A clinical study involving multiple centers (12) and investigators (14)


A randomized, prospective, observer-masked, contralateral eye study. 130 subjects (260 eyes) underwent femtosecond laser-assisted cataract surgery with phacoemulsification in both eyes, 1 to 2 weeks apart. Eyes scheduled to be implanted with Alcon Acrysof Toric IOLs. The first eye of each subject was randomized to the study group (ORA System used to calculate IOL power and axis intraoperatively) or the control group (Alcon Acrysof Toric Calculator used to determine power and axis preoperatively). Subjects evaluated at 1 month. Primary endpoint is the percentage of eyes with postoperative refractive astigmatism ≤ 0.50 D. A secondary endpoint is the mean postoperative astigmatism.


A total of 111 bilaterally implanted subjects were available for analysis. The percentage of eyes with postoperative refractive astigmatism ≤ 0.50 D is 89.2% in the study group and 76.6% in the control group (p=0.006). Mean postoperative astigmatism is 0.29 ± 0.28 D in the study group vs. 0.36 ± 0.38 D in the control group (p=0.041).


ORA intraoperative aberrometry provides more accurate toric lens guidance (cylinder power and axis) and is more likely to reduce the postoperative astigmatism to ≤ 0.50 D than the toric calculator. The differences between the two groups are statistically significant.

Financial Interest:

One of the authors receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented

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