Abiathar Crescas
Abiathar Crescas (Aragonese: [aβiaˈtaɾ ˈkɾeskas], Catalan: [əβiəˈtaɾ ˈkɾeskəs]) was a 15th-century physician and astrologer from the Crown of Aragon (now part of Spain). He was head astrologer to King John II of Aragon, father of King Ferdinand of Aragon.
He could remove cataracts by a surgical procedure known as couching. In 1468 he restored the eyesight of King John in two simple operations, who was completely blind before the surgeries.
Crescas was a leader of Aragon's Jewish community.
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