| Methods |
Cross‐over randomised controlled trial |
| Participants |
36 computer workers of ≥ 19 years of age, who had a visual acuity of ≥ 20/40 and used a computer for at least 1 hr/day. |
| Interventions |
Eyeglasses: habitual correction and best correction (correcting optical blur) were each worn for a period of 1 month in a randomised order. |
| Outcomes |
Visual comfort (phone survey before and after 1 hour of work on participant's own computer, 5 times during each 1‐month period of the study and 3 times 3 months after the experimental portion of the study is completed); uncorrected refractive error; undesirable reactions (short survey at each visit); time and accuracy in completing editing and data entry tasks (4‐hour test once every 1‐month study period). |
| Notes |
There is no full‐text publication of this study (confirmed by authors). Data extraction was based on study registration information and a conference abstract. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Random sequence generation (selection bias) |
Unclear risk |
No information on method of randomisation. |
| Allocation concealment (selection bias) |
Unclear risk |
No information. |
| Blinding of participants and personnel (performance bias)
All outcomes |
Unclear risk |
"Double blind". Protocol states "subjects and doctors are masked". Unclear how this was done. |
| Blinding of outcome assessment (detection bias)
Primary outcomes |
Unclear risk |
"Double blind". Protocol states "subjects and doctors are masked". Unclear how this was done. |
| Blinding of outcome assessment (detection bias)
Secondary outcomes |
Unclear risk |
"Double blind". Protocol states "subjects and doctors are masked". Unclear how this was done. |
| Incomplete outcome data (attrition bias)
All outcomes |
Unclear risk |
No information, probably no drop‐outs. |
| Selective reporting (reporting bias) |
Unclear risk |
Unclear, as study protocol was registered post hoc. |
| Other bias |
Low risk |
No indication of other bias. |
