Add up daily hours on phone, computer, TV and tablet, compare the total with age-group recommendations, and flag eye-strain and sleep risks.
输入各设备使用时间后点击评估。
| Item | Formula | Source / Standard |
|---|---|---|
| Screen time | Sum of daily hours per device | screen use tracking |
| Share | Item/total ×100% | usage share |
| Break interval | Look away 20 s every 20 min | 20-20-20 rule |