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.

  • After 3 hours of continuous close-up time, get an hour of continuous distance time.
  • Do not 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.

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