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. 2022 Apr 8;16:818530. doi: 10.3389/fnins.2022.818530

FIGURE 4.

FIGURE 4

Non-linear regression of the RPC density and the AL in global and all eight sectors. The solid red line in (A–I) was the AL cutoff (27.94 mm) for the visual impairment. The dashed red line in (B–I) indicates the RPC density flexion point along with the AL. To the left of the dashed red line, the RPC density was stable and not correlated with AL. To the right of the dashed red line, decreases in RPC density were significantly correlated with AL elongation (corresponding r and p-values were shown in the respective panels). To the right of the solid red line, the eyes were at high risk of visual impairment. (A) Non-linear regression of the global RPC density and the AL. (B) Nasal-superior RPC density vs. AL with AL flexion point as 23.16 mm. (C) Nasal-inferior RPC density vs. AL with AL flexion point as 22.08 mm. (D) Inferior-nasal RPC density vs. AL with AL flexion point as 22.87 mm. (E) Inferior-temporal RPC density vs. AL with AL flexion point as 24.68 mm. (F) Temporal-inferior RPC density vs. AL with AL flexion point as 27.99 mm. (G) Temporal-superior RPC density vs. AL with AL flexion point as 26.25 mm. (H) Superior-temporal RPC density vs. AL with AL flexion point as 27.07 mm. (I) Superior-nasal RPC density vs. AL with AL flexion point as 23.01 mm. RPC, radial peripapillary capillary; AL, axial length.