**Core Concept**
Pigmentary glaucoma is a type of secondary glaucoma caused by the dispersion of pigment from the iris, leading to increased intraocular pressure (IOP) due to the blockage of the trabecular meshwork. This condition is often associated with conditions such as pseudoexfoliation syndrome and uveitis.

**Why the Correct Answer is Right**
The dispersion of pigment leads to the formation of pigment granules that accumulate in the anterior chamber, causing the trabecular meshwork to become clogged. This clogging of the trabecular meshwork results in increased resistance to aqueous outflow, leading to elevated IOP. The pigment granules can also cause a secondary inflammatory response, further contributing to the development of pigmentary glaucoma.

**Why Each Wrong Option is Incorrect**
**Option A:** Iris atrophy is not a direct finding associated with pigmentary glaucoma.
**Option B:** Uveitis is a condition that can cause secondary glaucoma but is not a specific finding in pigmentary glaucoma.
**Option C:** Neovascularization is not typically seen in pigmentary glaucoma.

**Clinical Pearl / High-Yield Fact**
Pigmentary glaucoma is often associated with conditions that cause dispersion of pigment, such as pseudoexfoliation syndrome. This condition is more common in men and is often seen in the younger population.

**Correct Answer:** D.