What is the indication for glaucoma agents?

Glaucoma agents are specifically indicated for the treatment of elevated intraocular pressure, which is a significant factor in the progression of glaucoma. This condition can lead to damage of the optic nerve and ultimately, vision loss if not properly managed. These agents work by either reducing the production of aqueous humor or increasing its outflow, thereby lowering the intraocular pressure and protecting the optic nerve.

The other options do not accurately reflect the primary purpose of glaucoma medications. Increasing intraocular pressure is contrary to the goal of treatment, as the aim is to lower this pressure. While muscle spasms and visual acuity may be relevant in other contexts or conditions, they are not the primary indications for glaucoma medications. Thus, the correct indication emphasizes the need to control elevated intraocular pressure to preserve sight in individuals with glaucoma.