| Methods |
RCT. Allocation concealment clear; masking of participants and primary investigators adequate, masking of outcome assessment adequate. |
| Participants |
150 patients of one surgeon who were having cataract surgery at Vancouver General Hospital, Canada. Age range 21‐95 years. |
| Interventions |
Retrobulbar block (50 patients): received 4 ml of anaesthetic; peribulbar block (50 patients): received 7 ml of anaesthetic; and modified retrobulbar block (50 patients): received 4.5 ml of anaesthetic. |
| Outcomes |
Akinesia, analgesia, orbital pressure, block supplementation, complications, patient satisfaction. |
| Notes |
|
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Random sequence generation (selection bias) |
Low risk |
Patients were randomly assigned by draw to one of the three blocks |
| Allocation concealment (selection bias) |
Unclear risk |
Allocation was by nurse drawing from an envelope |
| Blinding (performance bias and detection bias)
All outcomes |
Low risk |
Outcome assessor was not aware of the type of intervention |
| Selective reporting (reporting bias) |
Low risk |
All data reported on |
| Other bias |
Low risk |
Free of publication bias |
