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. 2023 Mar 16;37(15):3174–3179. doi: 10.1038/s41433-023-02470-7

Fig. 1. Schema of the 4 meridian categories of oblique astigmatism and comparison of the incidence of eyes with oblique astigmatism among the 4 meridian categories.

Fig. 1

Oblique astigmatism is classified into 4 meridian categories: (1) 31°–45° (category 1); (2) 46°–59° (category 2); (3) 121°–135° (category 3); and (4) 136°–149° (category 4). The incidence of eyes with oblique astigmatism was significantly greater in meridian categories 1 and 2 in left eyes and in meridian categories 3 and 4 in right eyes. *Statistically significant difference among the 4 meridian categories, †Statistically significant difference between each meridian category pair.