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並前往https://www.aoa.org/AOA/Images/Patients/Eye%20Conditions/20-20-20-rule.pdf

20-20-20 rule and digital eye strain - American Optometric ...

20. SECOND. BREAK. MINUTES. FEET. AWAY. Visit www.aoa.org for more tips on how to protect your eye health and to find a doctor of optometry near you for ...

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