We used two separate structural equation models to investigate the relationship of the NEI VFQ near-activities and distance-activities subscales with the various demographic, clinical, and psychological predictors (Moustaki, 2003; Skrondal & Rabe-Hesketh, 2004).
The value of the latent variable can be estimated for each subject based on the model parameter estimates and the subject's observed NEI VFQ items and other characteristics.
For researchers who use the NEI VFQ in clinical trials, measuring neuroticism may reduce the confounding effect of reporting bias on self-rated outcomes and may identify subgroups of patients for whom an intervention is more or less effective.
The National Eye Institute VFQ (VFQ-25, version 2000) was used to obtain a measure of the individual visual functioning in everyday life .
Next, following a break after the CS test, we proceeded to evaluate VFQ (VFQ-25, version 2000)  and depression.
It was also performed for differences between groups in depression (F = 1.99; p = 0.18) and VFQ variables ([chi square] = 3.08, p > 0.99).
Table 2 shows the mean score and SD of both groups in depression, P&R test, and VFQ before beginning training, on its completion, and 3 mo following completion.
in their use of the Rasch person-item map to analyze the field-test version of the VA Low Vision Visual Functioning Questionnaire (VA LV VFQ) .
The third instrument is the VA LV VFQ, originally intended to serve as a low-vision supplement to the NEI VFQ.
On the other hand, the VA LV VFQ went through the measurement development process and was developed for measuring the outcomes of low-vision services in clinical research.
The VA LV VFQ was developed by combining information on patients' perceptions of needs for low-vision devices with information from rehabilitation professionals on the goals addressed by rehabilitation programs and expected training outcomes .
Abbreviations: BRC = Blind Rehabilitation Center, CI = confidence interval, HRQOL = health-related quality of life, logMAR = logarithm of minimum angle of resolution, NEI = National Eye Institute, SD = standard deviation, VA = Department of Veterans Affairs, VFQ
= Visual Functioning Questionnaire.