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Session Title: Multifocal Technology and Comparative studies
Session Date/Time: Tuesday 08/10/2013 | 08:00-10:30
Paper Time: 08:06
Venue: Auditorium (First Floor)
First Author: : P.Buckhurst UK
Co Author(s): : J. Wolffsohn S. Naroo L. Davies S. Shah
To investigate the appearance of dysphotopisa in patients implanted with a +3.00D addition sectorial refractive multifocal intraocular lens (IOL).
Midland Eye Institute, UK
Forty subjects were divided equally into two groups and were implanted bilaterally with either the multifocal or monofocal IOL. Three months postsurgery dysphotopsia was assessed using a bespoke Halometer. The Halometer consisted of a bright LED mounted in the centre of an LCD screen with software to test the eccentricity at which randomized threshold visual acuity letters could be detected at orientations separated by 45 degrees. The subjective perception of glare was assessed on a 0-10 Likert scale and by the patients indicating which illustration of dysphotopsia best depicted their experience of the photopic phenomenon. Straylight was measured using the C-Quant (Oculus) and contrast sensitivity was also evaluated (Pelli-Robson chart and CSV1000).
In the sectorial refractive IOL group the halo size was greater in the inferior 270 and 225 degree positions (p<0.05) in comparison with the monofocal IOL group but were similar in all other positions (p>0.05). The 0-10 subjective perception of glare (Z=0.187) was similar however a greater number of subjects in the multifocal group associated their dyphotopsia appearance with the illustrations of decoupling and starbust. Straylight scores were similar between the monofocal and multifocal groups (p=0.556). Similar contrast sensitivity values were attained using the Peli-Robson test (p=0.402) and no significant difference in contrast sensitivity was found at any spatial frequency with the CSV1000 (p>0.05)
Sectorial refractive multifocal IOLs implanted with the segment in the inferior position create a unique photopic scotoma in the in the inferior visual field. This appears to have a minimal effect on contrast sensitivity and can be tolerated well by patients.
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