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Fig. 3 | Health and Quality of Life Outcomes

Fig. 3

From: Development of a new Rasch-based scoring algorithm for the National Eye Institute Visual Functioning Questionnaire to improve its interpretability

Fig. 3

Scale-To-Sample (Person–Item) Distribution for the NEI VFQ-­28­-R. The top panel shows the distribution of pooled participants on the visual functioning scale. The bottom panel maps the NEI VFQ-28-R items (grouped into two domains) onto the same visual functioning scale, highlighting item difficulty. Vertical dashed lines indicate the lower (left) and upper (right) extent of instrument coverage for the pooled participant population

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Health and Quality of Life Outcomes

ISSN: 1477-7525

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