Fig. 1.
Illustration of the segmentation lines of the third-party software. The left panel is based on Cirrus, the right panel on Heidelberg Spectralis. Top image: 6-mm horisontal OCT scan from of a healthy eye. The posterior hyaloid is detached both temporal and nasally to the fovea; this does not disturb the segmentation algorithm. Middle: The segmentation of the inner retina (the vitreo-retinal surface) and the outer retina (the RPEouter); these lines are used for calculation of the retinal thickness. Bottom: For the thickness of the outer retina (the RPE_OScomplex), the innermost line is defined at the level of the inner and outer segment junction (IS/OS) and the outer line is unchanged. As the Heidelberg Spectralis is based on averaged images, the contrast is higher