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. Author manuscript; available in PMC: 2021 Dec 2.
Published in final edited form as: Annu Rev Vis Sci. 2021 May 12;7:155–179. doi: 10.1146/annurev-vision-100119-125406

Figure 7.

Figure 7

Macular splitting versus macular sparing explained by variation in V1 size and location, coupled with variation in the boundary between posterior and middle cerebral artery perfusion territories. (a,c) Macular splitting occurs if posterior cerebral artery perfusion (red) is extensive, regardless of the size of V1 (black hatching). (b,d) Macular sparing occurs if the middle cerebral artery (blue) supplies posterior V1, where the macula is represented. The precise amount of macular sparing depends on the size of V1 and the location of the frontier between the two circulations but never exceeds 10°.