I think the most valuble invention is glasses. Because if people like me didnt have glasses we would not be able to see. If we can not see then how do we get aroung? I dont know. The person who created the first reconized pair of glasses was Salvino D'Armate.  All glasses have lens in the inside measured how good or bad your eyesight is abd they can have a full rim or a half a rim like mine do.