Procedure of eyelid manoeuvres
| Eyelid manoeuvre | Time | Repeats | Instruction | |
| Intervention | Baseline | |||
| Instructed blinking | Punctual | 10 s | 6 | Brief but without squeezing |
| Closure | 10 s | 15 s | 5 | Without force |
| Squeezing | 5 s | 15 s | 5 | Maximum force |
| Rubbing | 3 s | 15 s | 5 | Normal intensity and hand position |
Overview of performed eyelid manoeuvres, the timing of the experimental procedures, number of repeats and the instruction given to the patients.