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Jose Manuel Gonzalez-Meijome, Helena I Ferreira-Neves, Pedro Brito, Antonio Queiros, Manuel Monteiro, José Salgado-Borges; Light Distortion Size with Multifocal Diffractive and Monofocal Aspheric Intra-ocular Lenses in Pseudophakic Patients. Invest. Ophthalmol. Vis. Sci. 2014;55(13):4187.
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To measures the size of the light distortion surrounding a bright source of light as observed by pseudophakic patients implanted with diffractive multifocal intra-ocular lens (IOL) and a control population implanted with aspheric monofocal IOL.
Thirty-two patients (21 females: 11 males) aged 41 to 74 years of age (47±8 years) were recruited for this study. They had been implanted with diffractive multifocal IOL (AT Lisa, Zeiss). A control population consisted of sixty-five cataract patients (age 69±7 years, range: 53 to 86 years; 65% females) inplanted with monofocal aspheric IOL by the same experienced surgeon. Examinations were performance between 5 to 8 months after surgery and all patients achieved at least 0.8 decimal unaided monocular VA and at least 1.0 for best corrected visual acuity. The testing device consisted of small light emitting diodes (LED) surrounding a central intense source of light and has been previously described in the literature. The main outcome was the size of the light distortion area measured as the percentage (%) of the area of the testing device.
Average monocular (right eye only) light distortion for the diffractive IOL group was 46.7±16.2% (range: 24.8 to 84.8%) and this was significantly higher (Independent Samples T-Test p<0.05) than the value presented by the monofocal IOL group (25.2±16.6%, range: 7.9 to 90.0%). A correlation of monocular light distortion with age showed no effect of age on the results on either group. The analysis of the multifocal IOL group showed that there was a significant correlation between monocular and binocular distortion size (r=0.702, p<0.001) but the binocular size was significantly lower (30.6±11.2%) than the monocular size (Paired Sample T-test, p<0.05). The binocular distortion size was also significantly higher in the multifocal IOL compared with the monofocal IOL (p<0.0%).
Pseudophakic patients implanted with multifocal diffractive IOLs after cataract extraction present a significantly higher halo size compared to those implanted with aspheric monofocal intra-ocular lenses. The method used and the results presented might provide a clinically relevant quantitative measurement of the light distortion phenomena experienced by pseudophakic patients with multifocal IOL. The measurement of light distortion was feasible and rapid for all patients irrespective of their age.
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