A client with open-angle glaucoma is using pilocarpine ophthalmic solution, a miotic agent. Which action should the nurse at the eye clinic include in evaluating the effectiveness of the medication?

A. Check amount of drainage from each eye: Pilocarpine does not work by reducing eye drainage output in a way that would be measured externally. While increased aqueous humor outflow occurs internally, visible drainage from the eye is not an indicator of effectiveness. B. Use Snellen chart to assess visual acuity: Although visual acuity can improve if intraocular pressure is reduced, changes are often minimal. The main goal in open-angle glaucoma management is to preserve vision by lowering intraocular pressure. C. Review eye pressure measurements: Pilocarpine reduces intraocular pressure by contracting the ciliary muscle and increasing aqueous humor outflow through the trabecular meshwork. Monitoring intraocular pressure is the most accurate way to evaluate the drug’s effectiveness. D. Palpate eyelids for decreased swelling: Eyelid swelling is not a primary symptom of open-angle glaucoma, nor is it an expected indicator of pilocarpine’s therapeutic action. Palpation of the eyelids would not provide meaningful information about drug efficacy.