Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Items included in each instrument or subscale analyzed.
| Instrument (or Subscale) | NEI VFQ-25 Items Included |
|---|---|
| Massof algorithm (24 items used) | 5-18, 20-25, A4, A5, A6, A8 |
| Seven-item instrument18 | 5, 6, 8, 14, A3, A4, A8 |
| Near subscale | 5, 6, 7 |
| Near subscale with appendix items | 5, 6, 7, A3, A4, A5 |
| Distance subscale | 8, 9, 14 |
