Cargando…

Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements

PURPOSE: To evaluate the impact of different levels of positive and negative defocus on light disturbance (LD) measures and to understand how high-order aberrations (HOAs) and topographic quality parameters may influence the perception of photic phenomena. METHODS: Thirty young healthy subjects (21...

Descripción completa

Detalles Bibliográficos
Autores principales: Amorim-de-Sousa, A., Macedo-de-Araújo, R., Fernandes, P., Queirós, A., González-Méijome, J. M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Hindawi 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6334342/
https://www.ncbi.nlm.nih.gov/pubmed/30719337
http://dx.doi.org/10.1155/2019/2874036
_version_ 1783387692132728832
author Amorim-de-Sousa, A.
Macedo-de-Araújo, R.
Fernandes, P.
Queirós, A.
González-Méijome, J. M.
author_facet Amorim-de-Sousa, A.
Macedo-de-Araújo, R.
Fernandes, P.
Queirós, A.
González-Méijome, J. M.
author_sort Amorim-de-Sousa, A.
collection PubMed
description PURPOSE: To evaluate the impact of different levels of positive and negative defocus on light disturbance (LD) measures and to understand how high-order aberrations (HOAs) and topographic quality parameters may influence the perception of photic phenomena. METHODS: Thirty young healthy subjects (21 females and 9 males) attended this cross-sectional study. LD was evaluated with the light distortion analyzer (LDA) in natural accommodative and cycloplegic conditions with positive and negative induced defocus of 1.00D. HOAs were taken for a natural mesopic (without cycloplegia) and for fixed 5 mm (with cycloplegia) pupil size. The impact of corneal morphological parameters (SAI, SRI, and Q-value) in LD was also investigated. RESULTS: Positive and negative induced defocus of 1.00D significantly increased the size of LD (p < 0.010, Wilcoxon signed rank test) but not its irregularity index. Spherical-like HOAs were associated with the size of LD, while coma-like and total-like HOAs were associated with LD irregularity. Our results showed that SRI was significantly correlated with the size of the disturbance area (r=0.519, p=0.003, Spearman correlation) and SAI with both size (r=0.502, p=0.005, Spearman correlation) and irregularity (r=0.371, p=0.044, Spearman correlation). However, no correlation between the Q-value and LD parameters was found. CONCLUSIONS: The uncorrected positive and negative refractive errors might increase the size of the LD, such as the spherical-like HOAs, SAI, and SRI, instead of asphericity. Coma-like and total-like HOAs and SAI may influence the perception of irregularities in the LD shape. These results might have an impact on postrefractive surgery visual performance that should be investigated.
format Online
Article
Text
id pubmed-6334342
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher Hindawi
record_format MEDLINE/PubMed
spelling pubmed-63343422019-02-04 Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements Amorim-de-Sousa, A. Macedo-de-Araújo, R. Fernandes, P. Queirós, A. González-Méijome, J. M. J Ophthalmol Research Article PURPOSE: To evaluate the impact of different levels of positive and negative defocus on light disturbance (LD) measures and to understand how high-order aberrations (HOAs) and topographic quality parameters may influence the perception of photic phenomena. METHODS: Thirty young healthy subjects (21 females and 9 males) attended this cross-sectional study. LD was evaluated with the light distortion analyzer (LDA) in natural accommodative and cycloplegic conditions with positive and negative induced defocus of 1.00D. HOAs were taken for a natural mesopic (without cycloplegia) and for fixed 5 mm (with cycloplegia) pupil size. The impact of corneal morphological parameters (SAI, SRI, and Q-value) in LD was also investigated. RESULTS: Positive and negative induced defocus of 1.00D significantly increased the size of LD (p < 0.010, Wilcoxon signed rank test) but not its irregularity index. Spherical-like HOAs were associated with the size of LD, while coma-like and total-like HOAs were associated with LD irregularity. Our results showed that SRI was significantly correlated with the size of the disturbance area (r=0.519, p=0.003, Spearman correlation) and SAI with both size (r=0.502, p=0.005, Spearman correlation) and irregularity (r=0.371, p=0.044, Spearman correlation). However, no correlation between the Q-value and LD parameters was found. CONCLUSIONS: The uncorrected positive and negative refractive errors might increase the size of the LD, such as the spherical-like HOAs, SAI, and SRI, instead of asphericity. Coma-like and total-like HOAs and SAI may influence the perception of irregularities in the LD shape. These results might have an impact on postrefractive surgery visual performance that should be investigated. Hindawi 2019-01-02 /pmc/articles/PMC6334342/ /pubmed/30719337 http://dx.doi.org/10.1155/2019/2874036 Text en Copyright © 2019 A. Amorim-de-Sousa et al. http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Article
Amorim-de-Sousa, A.
Macedo-de-Araújo, R.
Fernandes, P.
Queirós, A.
González-Méijome, J. M.
Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements
title Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements
title_full Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements
title_fullStr Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements
title_full_unstemmed Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements
title_short Impact of Defocus and High-Order Aberrations on Light Disturbance Measurements
title_sort impact of defocus and high-order aberrations on light disturbance measurements
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6334342/
https://www.ncbi.nlm.nih.gov/pubmed/30719337
http://dx.doi.org/10.1155/2019/2874036
work_keys_str_mv AT amorimdesousaa impactofdefocusandhighorderaberrationsonlightdisturbancemeasurements
AT macedodearaujor impactofdefocusandhighorderaberrationsonlightdisturbancemeasurements
AT fernandesp impactofdefocusandhighorderaberrationsonlightdisturbancemeasurements
AT queirosa impactofdefocusandhighorderaberrationsonlightdisturbancemeasurements
AT gonzalezmeijomejm impactofdefocusandhighorderaberrationsonlightdisturbancemeasurements