**Core Concept**
Glaucoma treatment involves decreasing intraocular pressure (IOP) through various mechanisms such as reducing aqueous humor production, increasing outflow, or a combination of both. The goal is to prevent or slow vision loss by maintaining a target IOP.

**Why the Correct Answer is Right**
The correct answer is a medication that does not decrease IOP or is not primarily used in glaucoma treatment. Glaucoma medications can be broadly classified into prostaglandin analogs, beta-blockers, alpha agonists, carbonic anhydrase inhibitors, and miotics. Each class has a specific mechanism of action, such as increasing uveoscleral outflow (prostaglandin analogs) or reducing aqueous humor production (carbonic anhydrase inhibitors).

**Why Each Wrong Option is Incorrect**
* **Option A:** This agent is a prostaglandin analog that increases uveoscleral outflow, reducing IOP. It is commonly used in glaucoma treatment.
* **Option B:** This medication is a beta-blocker that reduces aqueous humor production, making it a suitable option for glaucoma management.
* **Option C:** This agent is an alpha agonist that reduces aqueous humor production and increases outflow through the uveoscleral pathway, making it a viable treatment option for glaucoma.

**Clinical Pearl / High-Yield Fact**
When selecting a glaucoma medication, consider the patient's age, medical history, and potential side effects. For example, prostaglandin analogs are generally well-tolerated but may cause changes in iris pigmentation.

**Correct Answer:** D