Self-assessed visual function outcome in cataract surgery : minimum important difference of the Catquest-9SF questionnaire
Background: The purpose of this study was to study the minimum important difference (MID) of the Catquest-9SF questionnaire in cataract surgery. Methods: A nationwide multi-center prospective randomized study was conducted using the Swedish National Cataract Register and the Catquest-9SF questionnaire. Randomized patients (n = 400) who had completed the Catquest-9SF before surgery and three months