Fig. 464. Model showing lens and formation of optic cup
A piece has been removed from the upper part of cup to show the cavity of the optic vesicle and the position of the inner layer of the cup (nervous layer of retina).
Bonnet calls attention to the fact that the two processes, lens formation and the invagination of the optic vesicle to form the optic cup, are more or less independent and that it is not correct to describe the lens as actually pushing in the outer wall of the vesicle. As evidence of this is noted the fact that typical optic cup formation may occur in cases where no lens is developed. The optic cup when first formed is not a complete cup, for the invagination of the optic vesicle is carried over along the posterior surface of the optic stalk forming the choroidal fissure (Fig. 464, see also p. 545).
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