Summary of findings for the main comparison. Progressive computer glasses versus monofocal computer glasses.
| Various progressive computer glasses compared with monofocal computer glasses for asthenopia | |||||
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Patient or population: computer workers Settings: workplace Intervention: progressive computer glasses Comparison: monofocal computer glasses | |||||
| Outcomes | Illustrative comparative risks* (95% CI) | No of participants (studies) | Quality of the evidence (GRADE) | Comments | |
| Assumed risk2 | Corresponding risk | ||||
| Monofocal computer glasses | Progressive computer glasses | ||||
| Asthenopia (change from baseline to 12 months) VAS scale 0 to 100 12 months' follow‐up |
The mean asthenopia change score in the control group was 2.51 | The mean asthenopia change score in the intervention group was 0.23 score points higher (4.97 lower to 5.00 higher) | 186 (1) | ⊕⊕⊝⊝ low1 | Change scores based on imputed correlation coefficient (0.7). Sensitivity analysis revealed no change |
| Headache (change from baseline to 12 months) VAS scale 0 to 100 12 months' follow‐up |
The mean headache change score in the control group was −3.42 | The mean headache change score in the intervention group was 11.02 score points higher (5.17 higher to 16.87 higher) | 186 (1) | ⊕⊝⊝⊝ low1 | Change scores based on imputed correlation coefficient (0.7) |
| *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 one level because of risk of bias and with one level because of imprecision (less than 300 participants).
2 This is the mean change score in the control group.