Figure 6: Ultrastructure of the outer retina of a normal 2-year-old dog (a) and that of the affected 3-year-old dog (b). Note the condensed configuration of the cone nuclei in the retina of the affected animal (arrow) in comparison to that of the normal one (in (a), arrow) and the dark appearance of the inner segments in the retina of the affected animal. Bar depicts magnification which is the same for (a) and (b).