Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position
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...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Medknow Publications & Media Pvt Ltd
2015
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4501142/ https://www.ncbi.nlm.nih.gov/pubmed/26139807 http://dx.doi.org/10.4103/0301-4738.159882 |
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author | Piñero, David P Camps, Vicente J Ramón, María L Mateo, Verónica Pérez-Cambrodí, Rafael J |
author_facet | Piñero, David P Camps, Vicente J Ramón, María L Mateo, Verónica Pérez-Cambrodí, Rafael J |
author_sort | Piñero, David P |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-4501142 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2015 |
publisher | Medknow Publications & Media Pvt Ltd |
record_format | MEDLINE/PubMed |
spelling | pubmed-45011422015-07-15 Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position Piñero, David P Camps, Vicente J Ramón, María L Mateo, Verónica Pérez-Cambrodí, Rafael J Indian J Ophthalmol Original Article 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. Medknow Publications & Media Pvt Ltd 2015-05 /pmc/articles/PMC4501142/ /pubmed/26139807 http://dx.doi.org/10.4103/0301-4738.159882 Text en Copyright: © Indian Journal of Ophthalmology http://creativecommons.org/licenses/by-nc-sa/3.0 This is an open-access article distributed under the terms of the Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Original Article Piñero, David P Camps, Vicente J Ramón, María L Mateo, Verónica Pérez-Cambrodí, Rafael J Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position |
title | Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position |
title_full | Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position |
title_fullStr | Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position |
title_full_unstemmed | Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position |
title_short | Positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position |
title_sort | positional accommodative intraocular lens power error induced by the estimation of the corneal power and the effective lens position |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4501142/ https://www.ncbi.nlm.nih.gov/pubmed/26139807 http://dx.doi.org/10.4103/0301-4738.159882 |
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