Figure 3. Lenses’ optical clarity after 7 d incubation. Lenses in the control group (A), and those in the 5 mM and 10 mM NAC-treated groups (C and D), were in grade 1 with a slight degree of opacification (minimal clouding of gridlines and gridlines still visible). Lenses in group B were totally opaque (grade 3, gridlines not seen at all). Most lenses in 20 mM and 40 mM NAC-treated groups were kept transparent (grade 0). Group A was the control group, group B was the hyperoxia-exposed rabbit lenses group, groups C-F were the hyperoxia-exposed, NAC-treated groups: 5 mM NAC (group C), 10 mM NAC (group D), 20 mM NAC (group E), and 40 mM NAC (group F)