Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/57813
Título: | Impact of defocus and high-order aberrations on light distortion measurements |
Autor(es): | Sousa, Ana Isabel Carvalho Amorim Araújo, Rute Juliana Ferreira Macedo Fernandes, Paulo RB Queirós, A. González-Méijome, José Manuel |
Data: | 2019 |
Editora: | Hindawi Publishing Corporation |
Revista: | Journal of Ophthalmology |
Citação: | Amorim-de-Sousa, Ana; Macedo-Araújo, Rute; Fernandes, Paulo; Queirós, António; González-Méijome, JM. Impact of defocus and high-order aberrations on light distortion measurements, Journal of Ophthalmology, 2019, 2874036, 1-8, 2019. |
Resumo(s): | 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 5mm (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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/57813 |
DOI: | 10.1155/2019/2874036 |
ISSN: | 2090-004X |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | ASSESSMENT AND ENHANCING VISUAL PERFORMANCE (2018 - ...) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Impact of Defocus and High-Order Aberrations on Light disturbance measurements.pdf | 3,18 MB | Adobe PDF | Ver/Abrir |