There is a huge unresolved problem with mesa driver / AMD / Intel GPUs. These dark themes are really awesome and help a little but many folks suffer from severe eye strain vs. usage on a Windows system. As much as I love Linux it is a huge deal breaker for me and any solutions would be God send. The issue even persists in a virtual system which is really weird. (For those interested >> display - Laptop screen causes eye strain on all linux distros except Ubuntu and elementary OS - Super User)