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I use the "red glasses" mostly for checking my lights on figure drawings or paintings. I look through the lens and note which areas stand out as the lightest on the model and then I check to see if those areas are standing out as lightest in my work. It's different than using a black mirror - which is safe to use for checking value, unlike the red lenses.
I also use a reducing lens to check drawing; it looks like your typical Sherlock Holmes magnifying glass. You hold it next to your drawing so that you can see your model through it. It kind of compresses or shrinks the model to make it the same size as your paper. And you glance back and forth between the two to check drawing, value, and color. I'm not sure I'm explaining this well, I hope it makes sense. Just a note, if you hold it at an angle to the model it will distort.
One of my fellow students swears by paper towel tubes! She says they really help you focus in and define an area. I haven't tried that one yet, I probably will sometime when I'm desperate.
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