If you have glasses, safety or prescription, you can make effective sunglasses by blacking part of the lenses out with ...electrical... tape. Tape is easy to work because you can run a couple of horizontal bands leaving a millimeter or two between them.
That's a great idea. Would also be easy to make a lens cover for snow/water blindness by using 3 or 4 small pieces of the blue masking tape (for removability) and leaving a '+' or inverted 'T' shaped opening in the middle. The tape could be extended slightly and doubled over the edges to form goggles.
Off to buy a small roll of blue tape for my psk. Thanks for the idea.........