The nurse is treating a patient diagnosed with the beginning stages of open-angle glaucoma. Which assessment data support this diagnosis?

Open-angle glaucoma involves progressive optic nerve damage from increased intraocular pressure, leading to peripheral vision loss. It is typically asymptomatic early, with gradual visual field constriction. Untreated progression results in irreversible blindness due to retinal ganglion cell loss. Rationale: A. Impaired central vision is not an early feature of open-angle glaucoma and occurs later in advanced disease. Early changes affect peripheral fields first. Absence of central involvement and presence of early field loss make this incorrect. B. Impaired peripheral vision is the hallmark early sign of open-angle glaucoma due to optic nerve fiber damage. Patients develop tunnel vision over time. Presence of visual field loss and progressive peripheral deficit directly supports this diagnosis. C. Eye pain is typically absent in open-angle glaucoma and is more characteristic of acute angle-closure glaucoma. This condition progresses silently. Lack of ocular pain and gradual asymptomatic course make this finding inconsistent. D. Opacity of the lens indicates cataract formation, not glaucoma. Cataracts cause clouded vision rather than increased intraocular pressure. Presence of lens opacity without optic nerve damage differentiates it from glaucoma.