How could a medieval nomadic explorer air-ship (bug-sized people) use the African mosquito's eyes for equipment building? there is no magic in their world apart from the fact that such a tiny species could build tools. By the way, they travel through the savannah at approximately 10m above ground and there are no humans. (Second question; improvements and criticism will be received well)
Edit: These people will cut the eyes using hand saws and then remove the excess flesh using knives. They (adults, children are usually 0.5) are 0.6 to 0.9 centimeters in height and they use the eyes of the mosquitos to build small shields and protective masks.
Extra detail They have access to the type of technology that Columbus had access to (compasses, knots etc.) and they live with the wildlife of late Pleistocene (to justify the fact that there's megafauna in the story)