Figure 4
Empirical and modeled pupil diameter ratios. (A) The PDR as a function of viewing angle that was observed by Mathur and colleagues in 30 subjects. Note that the peak PDR is slightly less than one, indicating that the pupil always had an elliptical shape with a vertical major axis in these measurements. Also, the peak value is shifted away from a viewing angle of zero. (B) The current model provides the parameters of the entrance pupil ellipse. When the experimental conditions of Mathur and colleagues are simulated in the model, the resulting PDR function (dashed red line) agrees well with the empirical result (black). (C) In blue is the output of a model of the entrance pupil presented by Fedtke and colleagues in 2010.
