3 hour rule

The 3 hour rule is a suggestion to keep a balance between near work and time spent using distance vision and reduce eye strain. This can be an effective alternative to the 20-20-20 rule.

• For every 3 hours of close-up time, try to get an hour of distance time.
• Try not to exceed 3 hours of close-up time.

If you do near work for 4 hours or more continuously, it is likely you will have ciliary spasm that is harder to resolve and it may be more difficult to make improvements.