The folks Weigh My Rack have reviewed the EyeSend belay glasses. Here's a few key things about what they had to say.
"The adjustment makes a particular difference if your climber is on vertical to steep overhang. Even while using traditional belay glasses, the belayer would need to tilt their head to follow a climber who is on a steep overhang."
"The adjustment lever itself was very nice to use. The lever movement was incredibly smooth and it doesn’t slip when you stop moving the lever."
"The PitchSix belay glasses strikes a nice balance between having a large field of view and also allowing you to be able to look over or under the prisms"
"The PitchSix belay glasses fit over sunglasses and prescription glasses. They fit especially well if you are open to wearing them lower on your nose."
"The PitchSix belay glasses fit over sunglasses and prescription glasses. They fit especially well if you are open to wearing them lower on your nose."