National Eye Institute Visual Function Questionnaire-25

The MCID depends on the subscale and context. General guidance: a change of 5–10 points on a subscale is considered clinically important; composite score changes of 5–15 points reflect meaningful improvement/decline. In cataract surgery, patients typically improve 15–25 points overall. Smaller improvements (3–5 points) in glaucoma or AMD reflect slower disease trajectories.

Yes. Although VA is 20/200 or worse, patients retain functional vision and subjective experience. The VFQ-25 captures residual near and distance activities, peripheral vision use, and emotional impact. In blind patients (no light perception), most items may yield floor scores, but it still documents QoL burden. For severe low vision, the VFQ-25 is more informative than VA alone.

The composite is the unweighted mean of all 12 subscale scores (each converted to 0–100). If a subscale has missing data, imputation protocols (e.g., average of completed subscales in that patient) apply. The overall score ranges 0–100, with higher = better function. Some analyses use weighted composites; check your instrument documentation.

The instrument is free for research and clinical use with minimal restrictions. No special license or training required—any healthcare provider or trained administrator can give it. In the US and many countries, it is in the public domain. Always cite Mangione et al. (2001) in publications.