Occasionally, the vitreous gel (the egg white–like substance that
fills most of the eyeball) pulls on the retina with enough force
to tear it. This separation of the retina from the back of the
eye allows fluid from inside the eye to enter through this tear
and detach the retina from the choroid (the nutrient-rich layer
underlying the retina). If this rupture is caught and treated
early, a retinal detachment (see illustration) may be prevented.
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