| http://www.w3.org/ns/prov#value | - Aetna considers endothelial keratoplasty procedures experimental and investigational for conditions with concurrent endothelial disease and anterior corneal disease, including anterior corneal dystrophies, anterior corneal scars from trauma or prior infection, ectatic conditions of the cornea such as keratoconus, pellucid marginal degeneration and ectasia after previous laser vision correction sur
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