Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/20704
Título: | Shedding light on night myopia |
Autor(es): | Lopez-Gil, Norberto Matos, Sofia Cláudia Peixoto de Thibos, Larry N González-Méijome, José Manuel |
Palavras-chave: | Night myopia Mesopic vision Accommodation Dark focus spherical aberration |
Data: | 2012 |
Editora: | Association for Research in Vision and Ophthalmology (ARVO) |
Revista: | Journal of Vision |
Resumo(s): | First described during the 18th century, the cause of night myopia remains a controversial topic. Whereas several explanations have been suggested in the literature, particularly related with accommodation or chromatic shift in scotopic light conditions, no definitive explanation for its aetiology has been provided. We describe an experiment in which ocular refractive state was objectively and subjectively measured while viewing two kind of stimulus: letters on a bright background and a punctual source of light in a dark background. We found that under photopic conditions the optimum refractive state of the accommodating eye is significantly more myopic when maximizing perceived quality of a point source on a dark background compared to a conventional letter chart with black letters on a white background. Optical modeling suggested this difference in refractive state is due to spherical aberration. Since isolated point sources are more likely encountered at night, whereas extended objects are more likely encountered in the daytime, our results suggest that a significant part of the night myopia phenomenon is determined by the nature of the visual stimulus and the visual task used to assess ocular refractive state. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/20704 |
DOI: | 10.1167/12.5.4 |
ISSN: | 1534-7362 |
Versão da editora: | http://www.journalofvision.org/ |
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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5.5.71. LOPEZ-GIL_12_JoV (Night Myopia).pdf | PDF version | 429,4 kB | Adobe PDF | Ver/Abrir |