Influence of field size on pupil diameter under photopic and mesopic light levels
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.
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°.
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|Item Type:||Journal Article|
|Keywords:||luminance, pupil size, photopic, mesopic, melanopsin|
|Divisions:||Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
|Copyright Owner:||Copyright 2011 Optometrists Association Australia.|
|Deposited On:||20 Mar 2012 04:38|
|Last Modified:||24 Mar 2015 22:27|
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