眼疲劳休息提醒计算器 — 公式

The 20-20-20 Rule

Every 20 minutes, look at something 20 feet away for 20 seconds.

Breaks Needed = Screen Hours x 60 / Break Interval

This simple rule significantly reduces digital eye strain by allowing your focusing muscles to relax and your blink rate to normalize.

Additional Tips

  • Blink frequently (we blink 66% less when staring at screens)
  • Adjust screen brightness to match surroundings
  • Position screen 20-26 inches from eyes

    • 计算示例

    8 hours of screen time with 20-minute intervals.

    1. Breaks = 8 x 60 / 20 = 24 breaks
    2. Total break time = 24 x 20 seconds = 480 sec = 8 min
    3. That is just 8 minutes of breaks across 8 hours