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Fig. 1. Representative digital images of the hyaloid arteries on the vitrad surface
of the retina of Champsocephalus gunnari, a white-blooded
channichthyid. (A) Original digital image; (B) cropped image; (C) binary
image; (D) binary image with superimposed concentric circle overlay. Grid
spacing between successive circles is fixed at 0.5 mm and red markings
indicate vesselgrid intersections. The asterisk denotes the optic disc
and the arrow indicates the retractor lentis muscle in image A. Scale bars, 3
mm (A); 2 mm (BD).