Figure 5.

Preferred orientation of collagen fibrils in the cornea and limbus of one control and one beg-affected eye at 3 months posthatch, sampled at 0.4 mm (control) and 0.5 mm (beg) intervals. There is more localized disturbance to the collagen pseudoannulus circumscribing the cornea in beg birds than in controls, where the normal predominantly tangential fibril alignment is more often replaced by orthogonal (inside open triangle) or near-vertical (open arrows). It was necessary to scale down the larger plots for montage display, as indicated in the color keys below each map. Broken lines mark the boundaries of the three structurally distinct regions of the cornea (the central orthogonal region, the peripheral pseudoannulus, and the outermost radial zone). Open circles show radial fibrils in the outermost tissue that may associate with ciliary musculature, and red arrowheads highlight the superior globe position. Control data reproduced from Boote et al. (5).