How to measure pupil dilation?

[acmibalo]

Is there a function governing the tracking of pupil's dilation dilation and how it is measured... The task I would like to do is to know if either the user has dilated his/her pupil or not. Do you have any idea how can this be done? Thanks and Sorry for this noob question it's because I am just new to this wonderful technology Hope someone could help. Many thanks.

[Anders]

According to the API, you get pupil size as part of the frame object once the system is calibrated. Have a look at the open source C# samples for an example of how this is done.