Davey Gudgeon was a mentioned student at Hogwarts School of Witchcraft and Wizardry in the 1970s. He almost lost his eye trying to get close enough to the Whomping Willow to touch its trunk. For their own safety (and possibly the Willow's as well), students were forbidden to go near the tree since that event occurred. It is possible that Davey sustained other injuries, because it is never mentioned that Davey did lose an eyeball.