Summary of findings 2. Progressive computer glasses with intermediate distance focus versus progressive glasses for daily use.
| Progressive computer glasses with intermediate focus compared with progressive glasses for daily use for asthenopia | |||||
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Patient or population: computer workers Settings: workplace Intervention: progressive computer glasses with intermediate distance focus Comparison: progressive glasses for daily use | |||||
| Outcomes | Illustrative comparative risks* (95% CI) | No of participants (studies) | Quality of the evidence (GRADE) | Comments | |
| Assumed risk2 | Corresponding risk | ||||
| Progressive glasses for daily use | Progressive computer glasses | ||||
| Asthenopia (two different scales), Short term follow‐up |
The standardized mean asthenopia score in the intervention group was 0.49 SD lower (0.75 lower to 0.23 lower) | 58 (2) | ⊕⊕⊝⊝ low1 | One cross‐over trial, (paired analysis) and one parallel trial | |
| Asthenopia Medium term follow‐up (6 months) |
The standardized mean asthenopia score in the intervention group was 0.64 SD lower (1.40 lower to 0.12 higher) | 35 (1) |
⊕⊕⊝⊝ low1 | ||
| Headache scale 1 to 6 1‐week follow‐up |
The mean headache score in the control group was 1.8 | The mean headache change score in the intervention group was 0.24 score points lower (0.55 lower to 0.07 higher) | 23 (1) | ⊕⊕⊝⊝ low1 | Cross‐over trial, paired analysis |
| Dizziness score 1 to 6 1‐week follow‐up |
The mean dizziness score in the control group was 1.08 | The mean dizziness score in the intervention group was 0.29 score points lower (0.51 lower to 0.07 lower) | 23 (1) | ⊕⊕⊝⊝ low1 | Cross‐over trial, paired analysis |
| *The basis for the assumed risk (e.g. the median control group risk across studies) is provided in footnotes. The corresponding risk (and its 95% confidence interval) is based on the assumed risk in the comparison group and the relative effect of the intervention (and its 95% CI). CI: confidence interval | |||||
| GRADE Working Group grades of evidence High quality: further research is very unlikely to change our confidence in the estimate of effect. Moderate quality: further research is likely to have an important impact on our confidence in the estimate of effect and may change the estimate. Low quality: further research is very likely to have an important impact on our confidence in the estimate of effect and is likely to change the estimate. Very low quality: we are very uncertain about the estimate. | |||||
1 We downgraded the quality of evidence with two levels because of imprecision (less than 300 participants).
2 This is the mean change score in the control group