Bowie received a serious injury at school in 1962 when his friend George Underwood punched him in the left eye during a fight over a girl. Doctors feared he would become blind in that eye. After a series of operations during a four-month hospitalisation,[17] his doctors determined that the damage could not be fully repaired and Bowie was left with faulty depth perception and a permanently dilated pupil. Despite their altercation, Underwood and Bowie remained good friends, and Underwood went on to create the artwork for Bowie's early albums.[18]Underwood established himself as a leading art illustrator doing album covers for such artists as Tyrannosaurus Rex (Futuristic Dragon), The Fixx (Phantoms, Reach the Beach and Calm Animals), Procol Harum (Shine On Brightly), Mott the Hoople (All the Young Dudes) and David Bowie (Hunky Dory and The Rise and Fall of Ziggy Stardust and the Spiders from Mars). Over this period, he produced hundreds of book covers, LP and CD covers, advertisements, portraits and drawings.