I was finally able to see the strain in my practice glass. I tried every pair of sunglasses I had laying around none were polarized of course. I purchased a cheap pair from the dollar store to see if they would work. I knew this glass had strain because I was told that on the classified page. I place the glass in front of my computer screen and ran paint with a white screen put my new glasses on and with anticipation saw very faint shadows. I was confused and started to figure the glasses were not that polarized, it's suppose to have some pretty good strain. Then for some reason when I started taking them off I seen it. For some reason I had to turn the glasses about 45 deg. to see it.
" For some reason I had to turn the glasses about 45 deg. to see it."
Some newer LCD screens have the polarizers at 0 and 90 degrees, but for years the front and rear polarizers on LCDs were at +/-45 degrees. Many new ones still have the polarizers at +/-45. It's due to the internal structure of LCDs and the need to create a more-or-less symmetric viewing cone for the typical user.