Final answer:
Beta-blocker eyedrops are the best treatment for primary open-angle glaucoma out of the listed options as they decrease the production of eye fluid and reduce intraocular pressure.
Step-by-step explanation:
Treatment for Primary Open-Angle Glaucoma
The best treatment option for primary open-angle glaucoma among the choices provided is a. Beta-blocker eyedrops. These medications, such as timolol, work by reducing the production of fluid in the eye, which in turn, decreases the intraocular pressure. Other treatments for glaucoma can include prostaglandin analogs, alpha agonists, and carbonic anhydrase inhibitors like acetazolamide, mentioned in the reference, which inhibits the enzyme to reduce fluid production. However, Prednisone eyedrops, Cipro eyedrops, and Erythromycin eyedrops cater to different conditions like inflammation and bacterial infections and aren't used for the treatment of primary open-angle glaucoma.