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The vascular tunic may be congested in young infants, but atrophy soon develops and may reach an extreme degree. The sclera ordinarily becomes quite thin throughout, but may retain almost a normal thickness at the equator of the globe and posteriorly. Posterior sclera ectasae may develop.
Dilatation and tortuosity of the anterior ciliary veins are due apparently to excessive flow of blood through them on account of the abnormally small amount carried off by the venae vorticosae. In the stage of degeneration, ectasae of the sclera occur most frequently near the equator of the globe. Spontaneous rupture may take place. Anterior Chamber. The anterior chamber is shallow, as a rule.
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