Figure 1. Transillumination pictures of lenses representative of each grade. Lens opacification of experimental animals was assessed to a specific grade in the range of 0 to 3. Each picture (A-D) is representative of each grade. A: Grade 0: absence of opacification (gridlines clearly visible); B: Grade 1: a slight degree of opacification, with minimal clouding of gridlines; C: Grade 2: diffuse opacification involving almost the entire lens, with gridlines faintly visible; D: Grade 3: extensive dense opacification involving the entire lens (gridlines not visible).