A Contralateral Eye Study Comparing Apodized Diffrative and Full Diffrative Lenses: Wavefront Analysis and Distance and Near Uncorrected Visual Acuity

Abstract

PURPOSE:To evaluate intraindividual visual acuity, wavefront errors and modulation transfer functions in patients implanted with two diffractive multifocal intraocular lenses.METHODS:This prospective study examined 40 eyes of 20 cataract patients who underwent phacoemulsification and implantation of a spherical multifocal ReSTOR intraocular lens in one eye and an aspheric Tecnis ZM900 multifocal intraocular lens in the other eye. The main outcome measures, over a 3-month follow-up period, were the uncorrected photopic distance and near visual acuity and the defocus curve. The visual acuity was converted to logMAR for statistical analysis and is presented in decimal scale. The wavefront error and modulation transfer function were also evaluated in both groups.RESULTS:At the 3-month postoperative visit, the mean photopic distance uncorrected visual acuity (UCVA) was 0.74 ± 0.20 in the ReSTOR group and 0.76 ± 0.22 in the Tecnis group (p=0.286). The mean near UCVA was 0.96 ± 0.10 in the ReSTOR group and 0.93 ± 0.14 in the Tecnis group (p=0.963). The binocular defocus curve showed measurements between the peaks better than 0.2 logMAR. The total aberration, higher-order aberration and coma aberration were not significantly different between the groups. The spherical aberration was significantly lower in the Tecnis group than in the ReSTOR group. (p=0.004). Both groups performed similarly for the modulation transfer function.CONCLUSION:The ReSTOR SN60D3 and Tecnis ZM 900 intraocular lenses provided similar photopic visual acuity at distance and near. The diffractive intraocular lenses studied provided a low value of coma and spherical aberrations, with the Tecnis intraocular lens having a statistically lower spherical aberration compared to the ReSTOR intraocular lens. In the 5 mm pupil diameter analyses, both intraocular lens groups showed similar modulation transfer functions.

Preoperative automatic visual behavioural analysis as a tool for intraocular lens choice in cataract surgery

“…Several studies have been performed to evaluate the best multifocal IOL diopter addition (20) . However, knowing the distance at which the patient executes most of his/her daily tasks, i.e., the patient's visual behavior, is critical for choosing an optimal IOL (27)(28)(29) . Through this unprecedented study, besides achieving a detailed medical history, we were able to add information regarding the type of patient activities performed throughout an entire day; distance estimates of patient sight; and estimates of the proportions of near, intermediate, and far sight.…”

Application of nanoimprinting technique for fabrication of trifocal diffractive lens with sine-like radial profile

“…Such chromatic aberration is typical for diffractive lenses including available IOLs with diffractive microrelief. 5,17,19,20 It was shown that despite relatively high chromatic aberrations, multifocal diffractive structures are widely used in commercially available refractive-diffractive IOLs, e.g., in lenses ReSTOR (Alcon Laboratories, Inc.) and Tecnis (Abbott Medical Optics, Inc.) families. In particular, the IOLs such as Tecnis ZM900 and ReSTOR SN60D3 function well in the human eye because the amount of the chromatic aberration is approximately the same, albeit with opposite sign, as the aberration in the refractive part of the eye (cornea and the refractive part of the IOL).…”

“…In particular, the IOLs such as Tecnis ZM900 and ReSTOR SN60D3 function well in the human eye because the amount of the chromatic aberration is approximately the same, albeit with opposite sign, as the aberration in the refractive part of the eye (cornea and the refractive part of the IOL). 19,20,21 According to Eqs. (4) and (14), the energy distribution between the foci in Fig.…”

Importância do centro cirúrgico ambulatorial para a realização de cirurgias de catarata em larga escala

“…-promoção de cirurgia economicamente acessível (2)(3)(4)(5)(6)(7)(8)(9) ; -oferta de cirurgia de boa qualidade, que proporcione resultados satisfatórios, utilizando novas tecnologias, e estimule a procura pelo tratamento (2,(10)(11)(12)(13)(14)(15)(16)(17)(18) .…”