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OCTA measures the parameters of the optic disc in the range of 4.5 mm × 4.5 mm. (a) Inside the optic disc: area surrounded by the inner blue circle; the peripapillary region: area between two blue rings. (b) RNFL thickness around the optic disc. (c) Peripapillary vessel density. (d) Peripapillary vessel measurement RPC layer range (ILM to NFL layer). (e) Peripapillary RNFL thickness four-quadrant zone. (f) Peripapillary vessel density four-quadrant zone.
