Fig. 2.

Spectral domain optical coherence tomography. a Cross-sectional automated segmentation of the outer nuclear layer (ONL) between the outer plexiform layer (OPL) and external limiting membrane (ELM) in a normal eye of an adult male. b ONL thickness in the 9 macula subfields in the corresponding eye. c Cross-sectional automated segmentation of the outer retinal segment (ORS) measured from the external limiting membrane (ELM) to Bruch’s membrane (BM). d Thickness measured with inbuilt callipers between the inner retinal pigmented epithelium to the outer ellipsoid zone border (RPE-EZ) at the trough of foveal dip. e Thickness measured with inbuilt callipers between the outer external limiting membrane border to the outer ellipsoid zone border (ELM-EZ) at the trough of foveal dip