Characteristics of each test condition
| Monocular | Binocular random single eye test | Binocular simultaneous both eye test | |
| Occlusion | – | – | – |
| Backlight | + | + | + |
| Eyes being examined (n) | One eye | Both eyes | Both eyes |
| Presentation method | One eye only | Both eyes randomly | Both eyes simultaneously |
| Awareness by patient (aware of which eye is being tested) | + | – | – |
| Awareness by examiner (aware of which eye is responding) | + | + | – |