ABSTRACT
Stereophotography of the optic disc provides objective documentation but, like drawings, requires subjective assessment. Detecting loss of ganglion cells, retinal nerve fiber layer (RNFL), and eventual optic disc damage and change is critical for glaucoma management. The RNFL thickness map is very similar to the GDx nerve fiber thickness map and represents the regional heights of the RNFL by color intensity scales with blue being low heights and red high or thick RNFL. Scanning laser polarimeter technology measures RNFL based on the change measurements according to the known linear relationship between the two. The first available optical coherence tomograph was the Stratus optical coherence tomography (OCT), which was designed to measure the retina along with RNFL thickness, optic disc topography, and macular thickness. Computer-based imaging techniques with spectral domain-OCT show considerable promise for detecting abnormalities in eyes with glaucoma.
