3 ms·
Interesting, are these like belay glasses, but with the prisms turned around?
by mangamadaiyan 6y ago
Interesting, are these like belay glasses, but with the prisms turned around?
- SilasX 6y agoI had to look that up, but yes that looks correct. Except that, from the diagram, it bends your view by less than a right angle. Opposite vertical direction though. https://en.m.wikipedia.org/wiki/Belay_glasses https://en.m.wikipedia.org/wiki/Belay_glasses