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whyis it that only some retinal tears bleed ? whar causes the bleeeing ?

Why do tears bleed and why do only some bleed , I've heard some retinal.holes don't bleed  such   as atrophic holes, why is that even if its full thickness?
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177275 tn?1511755244
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Atrophic holes arise from atrophy or tissue shrinking so there is no tearing of tissue vs an operculated hole or retinal tear which can shear blood vessels.
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177275 tn?1511755244
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