Can we assess baseline pain and global health retrospectively?
Over a 2-week interval, patients' retrospective assessments of baseline pain and global health are fairly accurate and adequately correlated with actual baseline scores. At the group level, retrospective assessments can provide acceptable data on baseline pain and global health. The wide variability between actual and retrospective assessments, however, indicates that even over short time intervals there is poor individual agreement between the two methods.
In patients who are glaucoma suspects, PERG signal anticipates an equivalent loss of OCT signal by several years.