[johnydepp]

I am not sure if this is the place to show code, but here's a small script which can help you remind about looking away from monitor and follow 20-20 rule (only for MAC-OS):

while : do

  for run in {1..5}
  do
      sleep 1
      tput bel
      echo "Eye Beep"
  done


  sleep 1200

done