Here's a pair of safety glasses that can be used for general safety.  Any material can be used as lenses and they can be also be swapped with different lenses as long as they are not glued to the frame.  The code that is given will allow you to modify and improve the original design.  The frame was designed with a "given size fits most" mindset.  After printing, the holes in the hinges of the front plate and the arms only need to be drilled out.  Once these holes are drilled, long screws with nuts or even more filament  can be used to attach the arms to the front plate.  If the ridge of the nose proves to be uncomfortable, a small chamfer can be created using a rasp. The arms can be flipped using any slicer program or by simply deleting the double slashes -//- on lines 2 and 32 that can be found in the code named "safety_glasses_arm".