1911 Encyclopædia Britannica, Volume 15… (1911)
“ In his old age he was blinded by cataract, but recovered his eyesight by the operation of couching. The Catalan revolt was pacified in 1472, but John had war, in which he was generally unfortunate, with his neighbour the French king till his death on the 20th of January 1479. He was succeeded by Ferdinand, his son by his second marriage, who was already associated with his wife Isabella as joint sovereign of Castile. ”
