Fig. 2From: Psychometric validation techniques applied to the IND-VFQ-33 visual function questionnaire: the Hyderabad ocular morbidity in the elderly study (HOMES)Item loading scatterplot after rotational factor analysis. Key: x-axis and y-axis reference line at the minimum item loading threshold of 0.5 on either factor, displayed. Factor 1 and factor 2 correlation = + 0.68Back to article page