First, a Patient is activated in the examination list. The Series Window with all the examinations appears on the left side of the screen. With a click on one of the examinations, this examination is selected and marked with a red frame. Now click on this button and the Trend Analysis Window appears. The analysis is based on this examination and all matching examinations of the same eye. Matching means examinations on the same perimeter group and with the same or a compatible examination program. Non-matching examinations can only be compared visually in the Series Window. Since version 3.3, a check box in the Options>Trend Window can allow a change of the perimeter group in a trend analysis. Details of the Trend Analysis Window