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.
Next, following a break after the CS test, we proceeded to evaluate VFQ (VFQ-25, version 2000)  and depression.
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.
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.
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.