**Core Concept:** Angle closure glaucoma is a type of glaucoma where the drainage angle of the eye becomes narrow or closed, leading to increased intraocular pressure and potential damage to the optic nerve. Secondary angle closure glaucoma occurs due to various factors.

**Why the Correct Answer is Right:**

**Correct Answer: D. Proliferative diabetic retinopathy**

In proliferative diabetic retinopathy, the blood vessels in the retina become abnormal, leading to new, fragile blood vessels growing in the vitreous humor. These vessels can obstruct the drainage angle of the eye, causing secondary angle closure glaucoma. This is a clinical scenario that occurs in patients with longstanding diabetes.

**Why Each Wrong Option is Incorrect:**

A. **Central serous chorioretinopathy**: This condition involves fluid accumulation under the retina, causing central vision disturbances but not angle closure. It is not a cause of secondary angle closure glaucoma.

B. **Traumatic glaucoma**: This results from physical injury to the eye and does not specifically involve the retina or its blood vessels. Traumatic glaucoma typically presents with severe pain and visual disturbances, not as a result of pre-existing retinal vascular disease.

C. **Ocular hypertension**: This is elevated intraocular pressure without any associated optic neuropathy or visual field loss. Ocular hypertension is a risk factor for primary angle closure glaucoma, not secondary type due to retinal vascular disease.

E. **Vitreous hemorrhage**: Vitreous hemorrhage is a sudden occurrence of blood within the vitreous humor, causing visual disturbances but does not involve the retina or its blood vessels. It is not a cause of secondary angle closure glaucoma.

**Clinical Pearl:** A thorough understanding of the various causes of angle closure glaucoma is essential for proper diagnosis and management of patients presenting with sudden vision loss or pain in the eye. In cases with secondary angle closure glaucoma, a detailed ophthalmologic examination, including slit-lamp biomicroscopy, is crucial to identify the underlying retinal vascular disease.