Preventative eyewear. I have 20/20 vision, but I have a $10 pair of reading glasses (+1 diopter) that I will put on when I feel eye strain setting in. This ef

Preventative eyewear. I have 20/20 vision, but I have a $10 pair of reading glasses (+1 diopter) that I will put on when I feel eye strain setting in. This effectively moves the focal point of my monitor further away (close to the edge of my focal range), allowing/forcing my eyes to focus differently. After a few hours, when eye strain again sets in, I remove the glasses (hence moving the focal point back closer to me). I've been doing this the past five years, during which I spend most of my waking hours in front of a monitor. My vision has not noticeably deteriorated, nor do I experience persistent eye strain.