Abiathar Crescas (Aragonese: [aβiaˈtaɾ ˈkɾeskas], Catalan pronunciation: [əβiəˈtaɾ ˈkɾeskəs]) was a 15th-century physician and astrologer from the Crown of Aragon (now part of Spain).
In 1468 he restored the eyesight of King John in two simple operations, who was completely blind before the surgeries.
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