Fig. 2

Grading of interferometric patterns in rabbits. Grade 0 corresponds to almost complete absence of the aqueous phase (a dog’s interferometry published with copyright permission [19]); grade 1 (15–30 nm of thickness) corresponds to a faintly visible homogeneous meshwork pattern; grade 2 (31–60 nm of thickness) corresponds to a more compact meshwork pattern with gray waves and occasional colored shades; grade 3 (61–100 nm of thickness) corresponds to a meshwork with waves and interference fringes with some colors noted; and grade 4 (more than 100 nm of thickness) corresponds to waves with many colors [19]