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. 2010 Jun 17;9:26. doi: 10.1186/1475-925X-9-26

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Copyright ©2010 Ferrari et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Typical pupil reflex of a healthy volunteer in the experiment with a series of 25 flashes at 1-s intervals. The indicated parameters are defined as follows: 1- Radius of pupil before the first flash; 2- Radius of pupil at largest constriction after the first flash; 3- Radius of pupil before the 10^thflash; 4- Radius of pupil at largest constriction after the 10^thflash; 5- Radius of pupil before the 25^thflash; 6- Radius of pupil at largest constriction after the 25^thflash; 7-Radius of pupil on reaching the plateau at 75% of pupil radius preceding the 25^thflash.