Hi, sorry it took a while to get back to you about the shoes, Enzie. The springs take a lot of the pressure off your feet and legs. They've been a real life saver for me. I stand at an easel all day and sometimes half the night and my feet had gotten so bad I ended up with plantar faciitis my second year of school, and was wondering if I was going to be able to make it through the four years. My poor feet have wonderfully greatly improved since getting the shoes! Friends who have them tell me that they help with back problems too. But it was kind of weird getting used to them. The first time I wore mine I was working in the kitchen and shifted my weight from one leg to the other and caused the spring to compress - my first thought was EARTHQUAKE! (I've been through a few of those.) They're pretty good for starting conversations at the mall too, complete strangers will come up and ask about them. Or just point at your feet and look at you like you're crazy.
About red filters, mine is called Color Evaluator II, and comes with green and red. I use both, but mostly the red. These don't have the hole like the Ruby Beholder. Their website is
www.cottagemills.com