Effect of monocular FD in animals with ONS compared to Sham surgery, expressed as the mean interocular differences in: (a) vitreous chamber depth, and (b) choroidal thickness. Surgery undertaken on day zero in the eyes that were subsequently form deprived. FD was terminated 17 days after surgery. (c) Correlation between interocular differences in vitreous and choroidal thickness in all FD animals; the line of best fit to all data points is shown. The changes in vitreous chamber depth are much larger than those in choroidal thickness and the data does not correspond to a 1:1 relationship as indicated by the dashed line. P values are from Holm Sidak comparisons: *, p < 0.05; **, p < 0.01; ***, p < 0.001.