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Optical coherence tomogram passing through the fovea of a normal eye illustrating retinal layers and terminology developed for the study. RNFL, retinal nerve fibre layer; PRL, photoreceptor layer; RPE, retinal pigment epithelium; NFT, neuroretinal foveal thickness (distance between inner high reflectivity band and inner margin of outer high reflectivity band at foveal centre); OHRBT, outer high reflectivity band thickness; NFT = 181 μ and OHRBT = 58 μ in this scan.
