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Physiological variations in pupil size and eccentricity of visual axis (angle kappa) impact quality of vision in asymmetric multifocal intraocular lens implants

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Session Details

Session Title: Pseudophakic IOLs: Toric & Multifocal

Session Date/Time: Tuesday 08/09/2015 | 08:00-10:30

Paper Time: 09:06

Venue: Room 11

First Author: : E.Pazo UK

Co Author(s): :    T. Moore   A. Nesbit   O. Richoz   R. McNeely   J. Moore   A. Spence     

Abstract Details


To evaluate visual performance after implantation of a new asymmetrically refractive multifocal intraocular lens (MIOL) with a +3.0 D near addition power.


Cathedral Eye Clinic, Northern Ireland, UK.


Seventy eyes of 51 consecutive cataract patients undergoing phacoemulsification surgery and implantation of SBL-3 MIOL were followed for 6 months. Pre and postoperative outcome measures included, VA, refraction, contrast sensitivity, stereopsis, QOV questionnaire, aberometry, pupil size and visual axes measured by NIDEK, OPD scan. The sample study was divided into two discrete groups according to the pupil offset. The small angle kappa group comprised for pupil offset of ≤0.25 mm and large angle kappa group comprised for pupil offset of ≥0.55 mm.


The mean pupil distance was reported to be 0.314 ± 0.154 mm under photopic conditions. In the sample group of 70 eyes, the small kappa angle group and large angle kappa group were 47% and 53% respectively. There was a statistically significant difference between the small angle kappa and large angle kappa groups (p<0.05) in relation to the quality of vision at night. There was also a noticeable trend of larger pupil diameter eyes experiencing better quality of night vision.


Patient visual satisfaction outcomes were found to be better with individuals having small to medium angle kappa preoperatively. Better quality of vision at night was associated with the patients with moderate to larger preoperative pupil diameter.

Financial Interest:


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