Totally agree. I never realized this until one day it started hurting to do work which really took the wind out of my sails. Adjusting my setup to better compensate for eye strain and rsi related issues really helped.
Unrelated to parent topic, but related to your comment on eyestrain, I have found that using f.lux to change the color temperature of my monitors to match the fluorescent lighting in my office (with a color temperature of 4200K) to do wonders for alleviating eyestrain.
Changing the temp on my monitor and making additional adjustments to my workspace helped. However, thank you for the suggestion. I had previously known this as a mac only software.