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Comparison of intermediate visual acuity with a trifocal and a bifocal toric IOL

Poster Details

First Author: K.Gundersen NORWAY

Co Author(s):                        

Abstract Details


Determination of the improvement in the intermediate range of the visual acuity after implantation of a trifocal toric IOL with respect to a bifocal toric IOL.


Private Eye Clinic in Haugesund, Norway


This prospective randomised controlled trial is comparing the intermediate visual acuity after bilateral implantation of a trifocal or bifocal toric IOL. Two groups of eleven patients were bilaterally implanted, randomly with a trifocal or a bifocal toric IOL. All study subjects had corneal astigmatism ≥ 1.0 in both eyes. The distance, intermediate and near visual acuities were assessed monocularly and binocularly, with or without correction. Objective defocus curves without and with the best distance correction were measured. Refraction, centration and rotational stability was tabulated. A subjective questionnaire assesses the overall patient’s satisfaction and optical side effects of both IOL types.


No statistical difference was seen between the uncorrected and the distance corrected distance and near visual acuities between groups. There was no statistically significant difference between groups in the intermediate visual acuity without correction. With the best distance correction, the difference becomes significant. The defocus curve with the distance correction also showed a significant difference between groups. Both IOLs achieved excellent refractive outcomes, a good centration and rotational stability. No difference was seen in the quality of life questionnaire between groups except for the spectacle independence. Nevertheless, the difference was not significant.


The implantation of a trifocal toric IOL is a safe and reliable procedure. It is significantly improving the intermediate vision with respect to a bifocal IOL

Financial Disclosure:

One or more of the authors research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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