Figure 2: Images of OCT and fundus examinations of healthy retinas from two different bird species. A: Image of infrared funduscopy of a pigeon (Columba livia domestica) enables a general overview of the location of the Pecten oculi and the area centralis (arrowheads in A and B). The arrow in A indicates position and orientation of the 2D OCT scan shown in B. B: The OCT image reveals detailed morphological information: the inner and outer nuclear layer (INL and ONL) in the central area increases in thickness, whereas the thickness of the nerve fibre layer (NFL) decreases to a minimum. C: Infrared image of the fundus oculi of a common buzzard (Buteo buteo). The asterisks in C-E indicate the location of the central fovea. D: 2D OCT scan of the deep convexiclivate fovea centralis of the common buzzard located at the position shown by the arrow in C. E: Series of OCT-scans can be transformed into a 3D image of the examined retinal area (same bird as in C and D; s superior, i inferior, n nasal, t temporal). The arrow indicates the Pecten oculi. F Precise retinal layer structure labelling of the same bird: NFL: Nerve Fiber Layer; GCL: Ganglion Cell Layer; IPL: Inner Plexiform Layer; INL: Inner Nuclear Layer; OPL: Outer Plexiform Layer; ONL: Outer Nuclear Llayer; ELM: External Limiting Membrane; PRS: Photoreceptor Segment; RPE/BM: Retinal Pigment Epithelium/Bruch’s Membrane complex; Chor: Choroid.