While working on my latest website, I started actually wondering if what I learned in grade school was true. I've been taught that programs like Word default to use a white background with black text because it's easier on the eyes than the old phosphorous displays which were always light-on-dark. However, I find more and more that it hurts much less for me to read light text on a dark background; my lenses feel like they're straining less, and irises can relax more due to the lower overall light level.
So is it true that dark-on-light is easier to read? Have we just been told this to make us believe that these programs are advanced or something like that? Was the change to dark-on-light made more to simulate ink-on-paper moreso than for visual comfort?