Following the 20:20:20 rule (every 20 minutes get up and stare for 20 seconds at something 20 feet away) will give your eyes the break that they need.
Felly drwy ddilyn rheol 20:20:20 (codi bob 20 munud gan syllu am 20 eiliad ar rywbeth 20 troedfedd i ffwrdd) bydd eich llygaid yn cael hoe.