Figure 1.

Shadow photographs of lenses from a 54-year-old human, a 16-month-old Rhesus monkey and a 7-year-old Cynomolgus monkey. Sagittal profiles are on the left and coronal (top) profiles on the right. The sagittal profile was used when measuring lens thickness, diameter and curvature. The lenses are shown with their anterior sides up and are magnified 20x relative to the ruler in the photograph.