ABCC8 and open-angle glaucoma: Genetically predicted one‐standard deviation reduction in HbA1c from ABCC8 inhibition were significant associated with lower risk of POAG in Europeans (OR = 0.211, 95% CI: 0.133–0.333; p < 0.001) and East Asians (OR = 0.070, 95% CI: 0.011–0.459; p = 0.0056).