Fig. 2From: Self-assessed visual function outcome in cataract surgery: minimum important difference of the Catquest-9SF questionnaireScatter plot showing improvement in Rasch score and answers to anchor question in Group 1. Group 1 comprises patients with a preoperative Rasch score of − 4.91 to − 1.50. The central line in the scatterplot is a line of best fit using the least squares method and the upper and lower lines represent 95% confidence intervalsBack to article page