Anytime we view an image up close, our eyes have to cross inward to bring it into focus. When screens are covered with fingerprint smudges, dust, and dirt, focusing becomes even more difficult and, over time, can strain eyes and lead to chronic headaches. Wipe your most-used screens daily with a microfiber cloth to get rid of grime.
—Peter Shaw-McMinn, assistant professor of clinical studies at the Southern California College of Optometry
Next: Could "the computer hunch" be causing you pain?