Tyler tries the measurement and finds that the ruler is pretty far below his pupil and his pupil is several mm wide, so it’s hard to line up the edge of the ruler with the center of one pupil and it’s...Tyler tries the measurement and finds that the ruler is pretty far below his pupil and his pupil is several mm wide, so it’s hard to line up the edge of the ruler with the center of one pupil and it’s also hard to tell which mark on the ruler lines up best with the center of his other pupil.
