I have installed a program called Break Reminder on my PC. It pops up
every 10 minutes (or whatever interval you want) to remind you to take a "micropause" - looking away
and/or stretching for a number of seconds (also configurable).
When it pops up, I spend ten seconds looking out my window, focusing on far-away
objects. Then I close my eyes for a few seconds and relax them.
These simple things, which take about a minute each hour, brought my vision
back to 20/20 after a regression. Everyone who works on a computer should do this, but
especially anyone who has had eye surgery. If you value your new-found vision,
take care of it.
Here are some resources: