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Once impaired through clouding or shape change, the best treatment option for restoring vision is corneal transplantation using full or partial thickness cadaveric grafts. However, donor corneas are globally limited and face rejection and graft failure, similar to other transplanted organs. Thus, there is a need for viable alternatives to donor corneas in order to increase supply, reduce rejection, and to minimize variability in tissue quality. To address this, researchers have developed new materials and strategies to tissue engineer full or partial thickness cornea grafts in order to repair, regenerate, or replace the diseased cornea. This progress report first reviews the anatomy and physiology of the cornea to frame the biological requirements and discuss the injuries and diseases that necessitate the need fortransplantation, as well as the requirements for a suitable donor tissue alternative. This is followed by recent progress using naturally derived biomaterials including silk, collagen, amniotic membranes, and decellularized corneas. Finally, remaining challenges in the field as they relate to the biomaterials discussed are identified, and the future research directions that should result in further advances in restoring corneal vision are highlighted.<\/jats:p>","DOI":"10.1002\/adhm.201701434","type":"journal-article","created":{"date-parts":[[2018,5,30]],"date-time":"2018-05-30T02:45:40Z","timestamp":1527648340000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":106,"title":["Natural Biomaterials for Corneal Tissue Engineering, Repair, and Regeneration"],"prefix":"10.1002","volume":"7","author":[{"given":"Rachelle N.","family":"Palchesko","sequence":"first","affiliation":[{"name":"Department of Biomedical Engineering Carnegie Mellon University  Pittsburgh PA 15213 USA"},{"name":"Louis J. 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