3 hour rule
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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, it is likely you will have ciliary spasm and it may be more difficult to make improvements.