stroma -- The middle tissue layer of the eye that makes up about 90 percent of the cornea. The stroma is composed of densely packed layers similar to pages of a book. KeraVision's Intacs is designed to be surgically placed within these dense layers. Here it is designed to remain permanently without maintenance, but it can also be removed by the surgeon.

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Photograph of the stroma showing its lamellar (layered) structure.
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The Structure of the Eye