Figure 2.

Construct validity was demonstrated by correlations of L-VISS score and standardized measures, and known-group comparisons. (A) Correlation of L-VISS score with pattern glare score (n = 139, of which episodic migraine n = 99; Kendall's τ = 0.35, P < 0.001). (B) Correlation of L-VISS score with light discomfort threshold (n = 58, of which episodic migraine n = 38; Kendall's τ = −0.25, P = 0.01). (C) Known-group comparisons show interictal L-VISS scores are higher in patients with episodic migraine (9.9 ± 5.7) compared with controls (3.6 ± 2.8; P < 0.001), and ictal L-VISS scores (19.7 ± 7.2) are increased compared with interictal scores (P < 0.001). L-VISS, Leiden Visual Sensitivity Scale.