Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position

Indian Journal of Ophthalmology

关键词: Community;    digital imaging;    Karnataka Internet-assisted Diagnosis of Retinopathy of Prematurity;    retinopathy of prematurity;    telemedicine;    universal screening;    Age-related macular degeneration;    en-face optical coherence tomography;    polypoidal choroidal vasculopathy;    Choroid;    enhanced depth imaging technique;    swept source optical coherence tomography;    Choroidal imaging;    choroidal thickness;    retinal dystrophies;    Choroidal neovascularization;    idiopathic juxtafoveal telangiectasis;    juxtafoveal retinal telangiectasia;    lutein;    macular edema;    macular pigment;    macular telangiectasia;    Müller cells;    parafoveal telangiectasis;    perifoveal telangiectasis;    retinal angiomatous proliferation;    retinal telangiectasis;    subretinal neovascularization;    zeaxanthin;    Microscope-integrated optical coherence tomography;    RESCAN;    spectral domain optical coherence tomography;    vitreoretinal surgery;    Central reading center;    randomized controlled trial;    Fundus autofluorescence;    lipofuscin;    retina;    Cystoid macular edema;    dexamethasone implant;    external limiting membrane;    optical coherence tomography;    Ozurdex;    serous retinal detachment;    uveitis;    Adaptive optics;    axial length;    cone density;    myopia;    Artifact;    foveal diameter;    foveal slope;    ocular magnification;    optical coherence tomography;    Emmetropization;    hand-held;    macular edema;    retinopathy of prematurity;    spectral-domain optical coherence tomography;    visual acuity;    Accommodating intraocular lenses;    Crystalens HD;    effective lens position;    intraocular lenses power;    keratometry;   

DOI  :  10.4103/0301-4738.159882

来源: DOAJ

【 摘 要 】

Purpose: To evaluate the predictability of the refractive correction achieved with a positional accommodating intraocular lenses (IOL) and to develop a potential optimization of it by minimizing the error associated with the keratometric estimation of the corneal power and by developing a predictive formula for the effective lens position (ELP). Materials and Methods: Clinical data from 25 eyes of 14 patients (age range, 52-77 years) and undergoing cataract surgery with implantation of the accommodating IOL Crystalens HD (Bausch and Lomb) were retrospectively reviewed. In all cases, the calculation of an adjusted IOL power (P IOLadj ) based on Gaussian optics considering the residual refractive error was done using a variable keratometric index value (n kadj ) for corneal power estimation with and without using an estimation algorithm for ELP obtained by multiple regression analysis (ELP adj ). P IOLadj was compared to the real IOL power implanted (P IOLReal , calculated with the SRK-T formula) and also to the values estimated by the Haigis, HofferQ, and Holladay I formulas. Results: No statistically significant differences were found between P IOLReal and P IOLadj when ELP adj was used (P = 0.10), with a range of agreement between calculations of 1.23 D. In contrast, P IOLReal was significantly higher when compared to P IOLadj without using ELP adj and also compared to the values estimated by the other formulas. Conclusions: Predictable refractive outcomes can be obtained with the accommodating IOL Crystalens HD using a variable keratometric index for corneal power estimation and by estimating ELP with an algorithm dependent on anatomical factors and age.

【 授权许可】

Unknown