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Table 4 Reliability and validity analysis

From: Psychometric properties of the Greek version of the NEI-VFQ 25

Subscale Number of items Intraclass correlation coefficients Cronbach's alpha Range of item-scale correlations Convergent validity Discriminant validity
General Health 1 0.841 NA NA NA NA
General Vision 1 0.889 NA NA NA NA
Ocular pain 2 0.803 0.851 0.893 – 0.903 100 100
Near activities 3 0.901 0.734 0.719 – 0.875 100 100
Distance activities 3 0.908 0.686 0.752 – 0.892 100 100
Vision specific social functioning 2 0.91 0.678 0.887 – 0.889 100 100
Vision specific mental health 4 0.823 0.786 0.596 – 0.837 100 100
Vision specific role difficulties 2 0.888 0.926 0.902 – 0.907 100 100
Vision specific dependency 3 0.826 0.848 0.835 – 0.899 100 100
Driving 3 0.871 0.757 0.575 – 0.953 100 100
Color vision 1 0.717 NA NA NA NA
Peripheral vision 1 0.84 NA NA NA NA
  1. N.A.: Not applicable (needs two or more items).