Search PubMed⌕ Search
Home/Archive/PubMed

PubMed · 16631056

Visual performance: Comparison of foldable intraocular lenses.

Harsha Bhattacharjee·Kasturi Bhattacharjee·Jnanankar Medhi
View original source ↗Export metadata ↓

Abstract

PURPOSE: To compare best distance visual acuity, color perception, and contrast sensitivity between eyes with an AcrySof Natural intraocular lens (IOL) (Alcon Laboratories Inc.) and fellow eye with an AcrySof IOL and to compare results in the IOL groups to those in normal, similarly aged patients with clear phakic eyes. SETTING: Sri Sankaradeva Nethralaya, Guwahati, India. METHODS: This prospective randomized parallel group single-center patient-masked examiner-masked study comprised 26 eyes of 13 healthy patients with bilateral age-related cataract. All patients had cataract surgery by phacoemulsification in both eyes; 1 eye received an AcrySof Natural IOL (SN60AT) and the fellow eye, an AcrySof (SA60AT) IOL. Final postoperative examination was performed at the end of 18 months. In addition to other findings, visual acuity, color perception, and contrast sensitivity were recorded. A group of normal, similarly aged phakic individuals with clear lenses was examined for contrast sensitivity. The records thus obtained were analyzed statistically. RESULTS: The AcrySof and AcrySof Natural IOL groups had a statistically significant improvement in visual acuity and color perception in comparison to preoperative status, and this was maintained until the last postoperative follow-up at 18 months. There was no statistically significant difference in the findings between the 2 IOL groups. The AcrySof and the AcrySof Natural IOL groups showed significant improvement in contrast sensitivity from the preoperative to the postoperative period (both P < .001). However, the AcrySof Natural IOL group was better than the AcrySof IOL group when each group was compared separately to similarly aged phakic individuals with clear lenses. CONCLUSIONS: Pseudophakia following AcrySof Natural SN60AT and AcrySof SA60AT IOL implantation led to equivalent visual acuity and color perception. But the contrast sensitivity in the AcrySof Natural group was better and near normal in reference to a healthy, age-matched control group.

Explore related subjects

Acrylic ResinsAgedColor PerceptionContrast SensitivityDouble-Blind MethodFemaleHumansLens Implantation, IntraocularLenses, IntraocularMaleMiddle AgedPhacoemulsificationProspective StudiesPseudophakiaVisual AcuityComparative StudyJournal ArticleRandomized Controlled TrialResearch Support, Non-U.S. Gov't

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Harsha Bhattacharjee, Kasturi Bhattacharjee, Jnanankar Medhi. 2006. Visual performance: Comparison of foldable intraocular lenses.. https://doi.org/10.1016/j.jcrs.2005.12.136

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

PubMed2007

Influence of the activator in an acrylic bone cement on an array of cement properties.

In all but one of the acrylic bone cement brands used in cemented arthroplasties, N,N-dimethyl-4-toluidine (DMPT) serves as the activator of the polymerization reaction. However, many concerns have been raised about this activator, all related to its toxicity. Thus, various workers have assessed a number of alternative activators, with two examples being N,N-dimethylamino-4-benzyl laurate (DMAL) and N,N-dimethylamino-4-benzyl oleate (DMAO). The results of limited characterization of cements that contain DMAL or DMAO have been reported in the literature. The present work is a comprehensive comparison of cements that contain one of these three activators, in which the values of a large array of their properties were determined. These properties range from the setting time and maximum exotherm temperature of the curing cement to the variation of the loss elastic modulus of the cured cement with frequency of the applied indenting force in dynamic nanoindentation tests. The present results, taken in conjunction with those presented in previous reports by the present authors and co-workers on other properties of these cements, indicate that both DMAL and DMPT are suitable alternatives to DMPT.

Acrylic Resins↗
PubMed2007

Dynamic scaling of polymer gels comprising nanoparticles.

We present dynamic light scattering (DLS) measurements of soft poly(methyl-methacrylate) (PMMA) and polyacrylamide (PA) polymer gels prepared with trapped bodies (latex spheres or magnetic nanoparticles). We show that the anomalous diffusivity of the trapped particles can be analyzed in terms of a fractal Gaussian network gel model for the entire time range probed by DLS technique. This model is a generalization of the Rouse model for linear chains extended for structures with power law network connectivity scaling, which includes both percolating and uniform bulk gel limits. For a dilute dispersion of strongly scattering particles trapped in a gel, the scattered electric field correlation function at small wavevector ideally probes self-diffusion of gel portions imprisoning the particles. Our results show that the time-dependent diffusion coefficients calculated from the correlation functions change from a free diffusion regime at short times to an anomalous subdiffusive regime at long times (increasingly arrested displacement). The characteristic time of transition between these regimes depends on scattering vector as approximately q(-2), while the time decay power exponent tends to the value expected for a bulk network at small q. The diffusion curves for all scattering vectors and all samples were scaled to a single master curve.

Acrylic Resins↗