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Keep a distance of 30cm from the computer.
Use a computer for 30 minutes each time.
Use a computer for 3 days a week. 
Can't use the computer for 2 hours before going to bed. 
Use a computer for no more than 3 hours a day.

Use a computer for no more than 3 hours a day.
Exercise your eyes by periodically looking away from your computer to focus on distant objects.
Can't use the computer in dark place.
Every 30-60 minutes, take a brief (2-5 minute) break to stretch or walk around.
Completely rest your wrists during breaks, including taking your hands off the mouse.

Use a computer for no more than 3 hours a day.
Can't use the computer in dark place.
For prolonged use, it's best to add a separate monitor and keyboard. The laptop can be planced on books so the top of the screen is at eye level, then use an external keyboard so that your elbows can rest at 90° by your side.
Keep a distance of 30 cm from the computer.
Use a computer for 1 hour each time.