| Brand Name | Drop factor displayed on the packaging | Drop factor value on packaging | Experimentally measured drop factor |
| f (%) | gtt/ml | Mean (SD) | |
| Dolphin | 5 | 20 | 20.0 (0.0) |
| Life Sign | 0 | - | 20.0 (0.0) |
| PHH | 5 | 20 | 20.0 (0.0) |
| Agary | 5 | 20 | 20.0 (0.0) |
| Fantastic | 5 | 20 | 20.0 (0.0) |
| Summary | 20 (80%) | 20 | 20.0 (0.0) |