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. 2021 Mar 17;13(3):978. doi: 10.3390/nu13030978

Figure 2.

Figure 2

Protection of low spatial frequency-based visual contrast sensitivity function (VCSF) by danshensu treatment. (a) Representation of the inverted U-shape diagram of VCSF curve; (b) VCSF visibility index. Individual threshold with details represented in 0.033 cpd (a), 0.055 cpd (b), 0.082 cpd (c), 0.164 cpd (d), 0.328 cpd (e), and 0.437 cpd (f). Data are mean ± SD, Mann–Whitney U test, N.S., non-significant. ### p < 0.001, compared with the blank group. *** p < 0.001, and ** p < 0.01, compared with the vehicle group.