Can a person have glaucoma and 20/20 vision at the same time?

Yes: As long as the central visual field is spared 20 20 vision is possible

Yes: Glaucoma is a disease where the peripheral vision is usually first affected. Even a patient with extensive glaucoma damage , leaving only central tunnel vision can see the 20/20 line. Only if the central vision is lost with total optic nerve damage will the visual acuity be lost.

Most do: Most people with glaucoma have good vision. This is because glaucoma effects the visual acuity very late in the disease. However when this occurs, it is irreversible.