Table 2 Subjective fatigue evaluation.
level | Fatigue state | State characteristics |
|---|---|---|
0 | No fatigue | Without obvious characteristics |
1 | Mild fatigue | Mild eyestrain and grittiness |
2 | Less moderate fatigue | Moderate or less moderate eyestrain, mild stinging and dizziness |
3 | Moderate fatigue | Moderate or less severe eyestrain, moderate or less moderate stinging, mildly bleary, moderately dizzy, mild and less moderate nausea and headache |
4 | Less severe fatigue | Severe or less severe eyestrain, severe grittiness, moderate or less severe dizziness and nausea |
5 | Severe fatigue | Severe eyestrain, severe dizziness, severe or less severe headache, nausea and vomiting |