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https://hdl.handle.net/1822/37098
Título: | Errors associated with IOLmaster biometry as a function of internal ocular dimensions |
Autor(es): | Ribeiro, Miguel António Faria Ferreira, Daniela Lopes Gil, Norberto Lopez Jorge, Jorge González-Méijome, José Manuel |
Palavras-chave: | Intra-ocular lens calculation IOL calculation Axial length measurement |
Data: | 2014 |
Editora: | Elsevier Doyma |
Revista: | Journal of Optometry |
Citação: | Faria-Ribeiro, Miguel; Lopes-Ferreira, Daniela; López-Gil, Norberto; Jorge, Jorge; González-Méijome, José Manuel. Errors Associated with IOLMaster Biometry as a Function of Internal Ocular Dimensions, Journal of Optometry, 7, 2, 75-78, 2014. |
Resumo(s): | To evaluate the error in the estimation of axial length (AL) with the IOLMaster partial coherence interferometry (PCI) biometer and obtain a correction factor that varies as a function of AL and crystalline lens thickness (LT). Methods: Optical simulations were produced for theoretical eyes using Zemax-EE software. Thirty-three combinations including eleven different AL (from 20 mm to 30 mm in 1 mm steps) and three different LT (3.6 mm, 4.2 mm and 4.8 mm) were used. Errors were obtained comparing the AL measured for a constant equivalent refractive index of 1.3549 and for the actual combinations of indices and intra-ocular dimensions of LT and AL in each model eye. Results: In the range from 20 mm to 30 mm AL and 3.6---4.8 mm LT, the instrument measurements yielded an error between −0.043 mm and +0.089 mm. Regression analyses for the three LT condition were combined in order to derive a correction factor as a function of the instrument measured AL for each combination of AL and LT in the theoretical eye. Conclusions: The assumption of a single ‘‘average’’ refractive index in the estimation of AL by the IOLMaster PCI biometer only induces very small errors in a wide range of combinations of ocular dimensions. Even so, the accurate estimation of those errors may help to improve accuracy of intra-ocular lens calculations through exact ray tracing, particularly in longer eyes and eyes with thicker or thinner crystalline lenses. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/37098 |
DOI: | 10.1016/j.optom.2013.12.005 |
ISSN: | 1888-4296 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - OCV - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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5.6.46. FARIA-RIBEIRO_14_JOPTOM_(IOLMaster).pdf | 542,03 kB | Adobe PDF | Ver/Abrir |