This is a followup to https://news.ycombinator.com/item?id=6787687. There seems to be general community interest, so I thought I'd go ahead and create an actual poll.
In an average week how many hours a day are you looking at a screen? Computer/TV/Phone/Tablet/Other
http://justgetflux.com/
I started using redshift a few months ago to try and rein in my sleep schedule, but it's also done wonders for eye fatigue. Highly recommended.
For those of you who aren't familiar with these utilities, they basically adjust the color temperature of your display on a schedule with the goal of reducing your exposure to bright blue light before bed. Can be toggled if you need to do work with accurate colors.