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. 2021 Aug 12;36(9):1820–1825. doi: 10.1038/s41433-021-01740-6

Fig. 1. Box plot showing the difference of the serum retinol concentrations in patients with normal-tension glaucoma, primary open-angle glaucoma and healthy subjects.

Fig. 1

The serum retinol concentration of normal-tension glaucoma was statistically lower than that of primary open-angle glaucoma or healthy group. The numbers in the figure stand for median values of serum retinol concentrations.