You are caring for a 78-year-old woman who is wondering why she was diagnosed with glaucoma. Although she has several risk factors, which of these is not one of them?

Age over 60 and Mexican-American ancestry are both risk factors for glaucoma. Elevated blood pressure also is a risk factor as it can cause optic nerve damage. 20/80 vision, while poor, is not a causal factor for glaucoma.