Optical sectioning of the retinal layers. (A) Adaptive optics scanning laser ophthalmoscope (AO-SLO) is focused at the external limiting membrane and shows the mosaic of cone photoreceptors. (B) Optical section of the inner retina, showing light scattered from the blood vessels. (C) Optical section with the focus on the surface of the retina, showing the striation of the nerve fiber bundles. The image is from a location about 4 degrees inferior to the fovea center. Adapted from the article of Roorda [14].