Influence of field size on pupil diameter under photopic and mesopic light levels
Data(s) |
01/11/2011
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Resumo |
Purpose: We investigated the interaction between adapting field size and luminance on pupil diameter when cones alone (photopic) or rods and cones (mesopic) were active. Method: Circular achromatic targets (1o to 24o diameter) were presented to eight young participants on a rectangular projector screen. The accommodative influence on pupil diameter was minimized using cycloplegia in the fixing right eye and the consensual pupil reflex was measured in the left eye. Target luminance was adjusted for each stimulus such that corneal flux density (product of field area and luminance) was constant at 3600 cd.deg2m-2 (photopic condition) and 1.49 cd.deg2m-2 (mesopic condition). Results: There were no statistically significant effects of adaptive field size on pupil diameter for either condition. Conclusion: If corneal flux density is kept constant, there will be no change in pupil diameter as the size of the stimulus field increases at either mesopic or photopic lighting levels up to at least 24°. |
Formato |
application/pdf |
Identificador | |
Publicador |
Optometrists Association Australia |
Relação |
http://eprints.qut.edu.au/49226/2/49226.pdf DOI:10.1111/j.1444-0938.2011.00636.x Atchison, David A., Girgenti, Cameron C., Campbell, Giles M., Byrnes, Tim M., & Zele, Andrew J. (2011) Influence of field size on pupil diameter under photopic and mesopic light levels. Clinical and Experimental Optometry, 94(6), pp. 545-548. |
Direitos |
Copyright 2011 Optometrists Association Australia. |
Fonte |
Faculty of Health; Institute of Health and Biomedical Innovation; School of Optometry & Vision Science |
Palavras-Chave | #luminance #pupil size #photopic #mesopic #melanopsin |
Tipo |
Journal Article |