You know what is NOT a good idea?
Going to the eye doctor the week you are trying to write your dissertation rough draft.
I had my pupils dialated, and I lost a whole night of work since it gave me a bitching headache. All I could do was sit in my living room with dark shades on, the lights off, and watch some TV from a distance. I couldn't read, write, or look at a computer screen. So, I watched some Buffy the Vampire Slayer.
Well, the positive side is that I got a lot of sleep last night!
...back to work!