The logic of the wizarding world does not make any sense, in their logic it is easier to regrow an arm of bones than to fix the eyesight of the main protagonist (also did anyone else wonder why Harry seemed to be the only student with glasses).
logic
The logic of the wizarding world does not make any sense, in their logic it is easier to regrow an arm of bones than to fix the eyesight of the main protagonist (also did anyone else wonder why Harry seemed to be the only student with glasses).