Table 1 Variable assignments for environmental factors related to myopia
Variable | 0 | 1 | 2 | 3 |
|---|---|---|---|---|
Duration of reading and writing each day | <1 h | 1 ~ 2 h | 2 ~ 3 h | ≥ 3 h |
Parents’ education level | Junior middle school equivalent or less | Senior middle school equivalent (Technical school) | Undergraduate degree (Junior college/college) | Postgraduate degree (Masters, PhD) |
Duration of electronic devices | <1 h | 1 ~ 2 h | 2 ~ 3 h | ≥ 3 h |
Duration of outdoor activity each day | <1 h | 1 ~ 2 h | 2 ~ 3 h | ≥ 3 h |
Most frequently used electrical device | television | computer | phone | tablet |
Whether to rest after a period of continuous reading | no | yes | ||
Whether to check vision every six months | no | yes | ||
Parents’ knowledge of vision care | Exactly not | A little | Some | Very well |
Supervision of children’s vision protection | never | sometimes | often | always |
Whether to wear glasses for children after myopia | no | yes | ||
Parents’ awareness of the hazards of myopia | light | moderate | heavy | severe |
Whether the child piddle | no | yes | ||
Frequency of eating sweets or carbonated beverages | never | once or twice a week | 3 ~ 5 times a week | Every day |