eyes for the current investigation was that only batch blood
sugar data were available for the diabetic animals from which
the study eyes were obtained, so that cell glycogen content
could not be correlated precisely with individual blood sugar
level. Retinal tissue blocks from one eye of 2-month-old
diabetic and control animals (n ¼ 6/group) were available for
electron microscopic analysis and at least one eye from 4-
month-old diabetic (n ¼ 11) and control rats (n ¼ 8) were
available for wax histology.