Table 1.
Summary of study visits and assessments
| Visit* | Timing | Assessments and procedures | Personnel |
|---|---|---|---|
| 1 | Week 0 | Screening tests Spectacle and prism measurements |
Practitioner |
| Mobility questionnaire (base line) | Masked data collector | ||
| 2 | Week 4 (approx) |
Dispense 1st pair prism glasses and train in use | Practitioner |
| 3 | Week 8 | Mobility questionnaire 1st pair Would you want to continue with 1st pair (yes/no) |
Masked data collector |
| Dispense 2nd pair prism glasses | Practitioner | ||
| 4 | Week 12 | Mobility questionnaire 2nd pair Would you want to continue with 2nd pair (yes/no) Comparison questionnaire (1st and 2nd pair) |
Masked data collector |
| Debriefing Clinical decision whether to continue wear |
Practitioner | ||
| 5 | 6 months after Visit 4 |
Telephone Interview to assess longer-term experience of wearing prism glasses (only subjects who decided at week 12 to continue) |
Practitioner |
*
Visits 1 to 4 were in-office; Visit 5 was a telephone interview