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Comparison of the quality of vision and the effect of decentration in two aspheric posterior chamber intraocular lenses

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First Author: K.Kedarisetti INDIA

Co Author(s):    A. Jain                    

Abstract Details

Purpose:

To study the quality of vision, measured by higher order aberrations (HOA) and contrast sensitivity, and to study the effect of decentration on the on the optical performance of 2 aspheric intraocular lenses of different designs: Aspheric Balance Curve design (Vivinex iSert XY1 (Hoya Surgical Optics, Inc.)) and posterior aspheric design (AcrySof IQ SN60WF (Alcon Laboratories, Inc.))

Setting:

Department of Ophthalmology, Post Graduate Institute of Medical Education and Research Institute, Chandigarh, India

Methods:

A Randomised controlled trial was carried out on patients operated for cataract surgery between January 2017 and December 2018. Either of the two above mentioned IOLs were implanted after cataract surgery, which were performed by a single surgeon. Best corrected visual acuity, Intra ocular pressure and slit lamp examination was done at every visit. Contrast sensitivity using Functional Visual Analyzer, and Itrace were performed at final follow up i.e. 3 months. Decentration of the lens, the aberrations produced and strehl ratio at different pupil sizes were documented on the Itrace.

Results:

85 eyes were included, 45 in the Vivinex group and 40 in the SN60WF group. There was no statistically significant difference between both the IOL designs in the mean values of the Strehl ratio, internal and total HOA, coma, trefoil or spherical aberrations produced. On comparing the HOA in eyes with angle alpha, Vivinex had a negative correlation with an increasing angle alpha as compared to SN60WF. The contrast sensitivity of SN60WF was significantly better than Vivinex at 1.5 cpd under photopic conditions (P=0.005). When decentered, the SN60WF proved worse at smaller pupil diameters, however this wasn’t statistically significant.

Conclusions:

Both IOLs proved to have similar higher order aberrations. Vivinex proved to be better in eyes with higher angle alpha, while SN60WF had better contrast sensitivity. Vivinex proved to be better than SN60WF by inducing lesser aberrations when decentered.

Financial Disclosure:

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