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Título

Astigmatism of the ex vivo human lens: Surface and gradient refractive index age-dependent contributions

AutorBirkenfeld, J. CSIC; Castro, Alberto de CSIC ORCID; Marcos, Susana CSIC ORCID
Palabras claveAstigmatism
Crystalline lens
GRIN
Fecha de publicación1-jun-2015
EditorAssociation for Research in Vision and Ophthalmology
CitaciónInvestigative ophthalmology & visual science 56: 5067- 5073 (2015)
Resumen© 2015 The Association for Research in Vision and Ophthalmology, Inc. PURPOSE. We estimated the contribution of the gradient refractive index (GRIN) and lens surfaces to lens astigmatism and lens astigmatic angle as a function of age in human donor lenses. METHODS. Human lenses were imaged, ex vivo, with 3D-spectral optical coherence tomography (OCT) and their back focal length was measured using laser ray tracing. The contribution of lens surfaces and GRIN to lens astigmatism were evaluated by computational ray tracing on the GRIN lens and a homogenous equivalent index lens. Astigmatism magnitude and relative astigmatic angle of and between lens surfaces, GRIN lens, and lens with homogeneous refractive index were evaluated, and all results were correlated with age. RESULTS. The magnitude of astigmatism in the anterior lens surface decreased with age (slope = -0.005 diopters [D]/y; r = 0.397, P =0.018). Posterior surface astigmatism and lens astigmatism were not age-dependent. Presence of GRIN did not alter significantly the magnitude or axis of the lens astigmatism. The astigmatism of GRIN lens and lens with homogeneous refractive index correlated with anterior lens surface astigmatism (GRIN, P = 3.9E - 6, r = 0.693; equivalent refractive index lens, P = 4.1E - 4, r = 0.565). The astigmatic angle of posterior surface, GRIN lens, and homogeneous refractive index lens did not change significantly with age. CONCLUSIONS. The axis of lens astigmatism is close to the astigmatic axis of the anterior lens surface. Age-related changes in lens astigmatism appear to be related to changes in the anterior lens astigmatism. The influence of the GRIN on lens astigmatism and the astigmatic axis is minor.
Descripción7 págs.; 5 figs.
Versión del editorhttp://dx.doi.org/10.1167/iovs.15-16484
URIhttp://hdl.handle.net/10261/130518
DOI10.1167/iovs.15-16484
Identificadoresdoi: 10.1167/iovs.15-16484
issn: 1552-5783
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