In recent years, reading difficulties has become a very weird and almost frightening situation for me as well. It contributes to sadness, since reading is a "balm" of sorts for me and I'm lost when this coping mechanism is tampered with.

I have bouts of very bad blurry vision. There are times that I wear my reading classes on top of my contacts.

I have problems with headaches, and when things are particularly bad with them, reading is limited. I have some very strange aches and pains in my arms and legs and I'm going to pay attention to any possible correlation.

BTW, I too have noticed this weird situation where I can read much better on the computer than the written page. It is curious.

Depression certainly can play a role and if the topic is of great interest to me, of course I can read with better comprehension. One of the reasons I like non-fiction so much is that I can skip chapters that bore me. Probably not the most "mature" thing in the world to do, but it does make reading more enjoyable, esp. when trying to deal with all sorts of dilemmas.