@billconan, the principle behind open designs is that the lenses literally "project" the image into your eye, and the screen brightness would always be higher than the ambient light. Try the design once maybe?.

Regarding the lenses, we currently cannot point you to a vendor who sells one, but there are a lot of options in ebay/aliexpress, or even your local hobby shop.

P.S: Thanks for pointing out the link issue. Fixed it.