Fig. 4

k coefficient agreement values of inter-observer agreement in different studies assessing vitreous haze (VH). Graphic representations of the agreement between the graders of the index study, Kempen study [23], Davis study [11], and Hornbeak study [22] are shown. The k values are reported by the top of the gray bars with their confidence intervals for the current study. No confidence interval was reported for the average k in the Kempen or Davis studies, and the Hornbeak intervals represent the range for the average inter-observer k value. 6-step scale NEI scale, 9-step scale Davis scale