If the entire thickness of the cornea is unhealthy, a full thickness corneal transplant may be required. This is called a penetrating keratoplasty (PK). Where the DSAEK procedure is focused on transplanting only the endothelial cell layer of tissue, during a PK procedure a perfectly round circle of cornea is removed from the patient and replaced with donor tissue. This new cornea is sutured into place with a stitch that is thinner than a human hair, for a comfortable healing process.
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