Purchase a pair of regular, preferably clear-framed sunglasses that have a sturdy frame. Remove the lenses and trace their shape onto sheets of Congo blue and primary red theatrical gels, which are made for stage lighting. Ensure that you have two pieces for each color and cut all four pieces out using the X-Acto knife. Glue the blue gels first and then the red ones, by touching the outer rim of the gels all the way around with super glue. Make sure that you put one of each color gel on each lens of the glasses so you end up with each eye filtering red and blue light. Gently lay the lenses inside the glasses one at a time and wait for them to dry.