Question: do you have a good quality LCD screen? I have 2 laptops: a MacBook and a Dell Vostro. I can use the MacBook comfortably for 5 to 6 hours at a stretch

Question: do you have a good quality LCD screen? I have 2 laptops: a MacBook and a Dell Vostro. I can use the MacBook comfortably for 5 to 6 hours at a stretch, whereas using the Dell for even 1 hour is a pain, even with brightness turned down to zero. Problem is, low-end laptop makers use crappy screens that burn your eyes. Even the MacBook screen is only okay-ish, not great. Buy a high-end LCD screen for your laptop. Your eyes will thank you. Besides that, try to use low-contrast color themes on your OS. Windows and most Linux distros have too many bright colors in their default themes, which make your eyes hurt after a while. Windows Classic is a great theme if you're using Windows. On Linux, you might want to use vanilla ClearLooks. Set your editor to use large, variable-width fonts. Also, ZenBurn and Wombat are two color schemes that are incredibly easy on the eyes. These are available for both Emacs and Vim. Oh, and take frequent breaks. Wash your eyes. Spend more time in natural light. Glasses are better than contacts, so get them as soon as you can manage to.