The frequency distribution of beam and pore diameters for the 14 EG animals, fit to a gamma distribution. The two fitted parameters that describe the gamma distribution are in the corner of each plot. For BD, neither shape nor scale changes significantly. For PD, there is no difference in shape, but scale has increased, equivalent to all pores being (6.9–5.9)/5.9 times larger (i.e., 17% larger) in the EG eyes.