**Core Concept**
Pigmentary glaucoma is a type of secondary glaucoma characterized by the dispersion of pigment from the iris into the anterior chamber, leading to inflammation, pigment aggregation, and increased intraocular pressure (IOP).

**Why the Correct Answer is Right**
Pigmentary glaucoma typically affects young, myopic individuals with a history of ocular trauma or surgery. The dispersion of pigment is thought to be due to the mechanical disruption of the iris pigment epithelium, leading to the release of pigment into the anterior chamber. This pigment can then accumulate on the trabecular meshwork, causing a mechanical blockage and increasing IOP.

**Why Each Wrong Option is Incorrect**
**Option A:** This statement is true about pigmentary glaucoma, as it is a common complication of ocular trauma and surgery.
**Option B:** This statement is true about pigmentary glaucoma, as it is often associated with a history of ocular trauma or surgery.
**Option C:** This statement is true about pigmentary glaucoma, as it can cause a significant increase in IOP, leading to optic nerve damage and vision loss.

**Clinical Pearl / High-Yield Fact**
Pigmentary glaucoma can be a challenging diagnosis, as the symptoms may be similar to those of primary open-angle glaucoma. However, the presence of pigment dispersion in the anterior chamber and a history of ocular trauma or surgery can help differentiate it from primary open-angle glaucoma.

**Correct Answer:** D.