Not confirmed directly. He's a secretive type! But, despite being of a species with poor night vision he describes himself as a creature of the night and is often seen out in dark enough conditions that a human has difficulty. He carries multiple pairs of glasses around despite having perfectly good eyes, and he's a spy in an organization where high levels of tech are so common they're taken for granted.

How about enough familiarity with such things to know how they're put together, so that when later he's given the more necessary parts he can fit them to frames more his size? Maybe with help.

Basically I just don't want him to have a pair of Yuuya's glasses. Those would reveal the size of Yuuya's head!