**Core Concept**
Choroidal neovascularization (CNV) refers to the formation of new blood vessels in the choroid layer of the eye, which can lead to vision loss. This condition is often associated with aging, trauma, and certain eye diseases.

**Why the Correct Answer is Right**
Choroidal neovascularization is a hallmark of age-related macular degeneration (AMD), a leading cause of vision loss in older adults. In AMD, CNV occurs due to the growth of new blood vessels from the choroid layer into the subretinal space, leading to leakage and scarring of the retina. This process is mediated by vascular endothelial growth factor (VEGF), which promotes angiogenesis.

**Why Each Wrong Option is Incorrect**
**Option A:** Age-related macular degeneration (AMD) is a well-established cause of choroidal neovascularization. **Incorrect because** it is a correct association.
**Option B:** Pathological myopia is another condition that can lead to choroidal neovascularization. **Incorrect because** it is a correct association.
**Option C:** High myopia is also associated with choroidal neovascularization. **Incorrect because** it is a correct association.
**Option D:** Diabetic retinopathy is primarily characterized by microaneurysms, hemorrhages, and retinal ischemia, but it is not typically associated with choroidal neovascularization. **Incorrect because** it is the correct answer.

**Clinical Pearl / High-Yield Fact**
Choroidal neovascularization can be treated with intravitreal anti-VEGF injections, which can help reduce leakage and prevent scarring of the retina.

**Correct Answer: D. Diabetic retinopathy. Diabetic retinopathy is primarily characterized by microaneurysms, hemorrhages, and retinal ischemia, but it is not typically associated with choroidal neovascularization.**