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Vivisection (from Latin vivus, meaning alive, and sectio, meaning cutting) is surgery conducted for experimental purposes on a living organism, typically animals with a central nervous system, to view living internal structure.
As we age, the gel-like substance that fills the eye (the vitreous) shrinks and separates from the retina. This is called a vitreous detachment, or posterior vitreous detachment (PVD) .In most cases, a vitreous detachment is not sight-threatening and does not require treatment.s we age, the gel-like substance that fills the eye (the vitreous) shrinks and separates from the retina. This is called a vitreous detachment, or posterior vitreous detachment (PVD) .