**Core Concept**
Congenital cataracts are a significant cause of visual impairment in children, and their classification is crucial for management. The most common types include lamellar, nuclear, and posterior subcapsular cataracts. **Congenital cataract** classification is based on the location and morphology of the lens opacity.

**Why the Correct Answer is Right**
The most common type of congenital cataract with significant visual disability is often related to the location and density of the opacity. **Lamellar cataracts** are typically associated with significant visual impairment due to their central location and dense opacity, affecting visual acuity.

**Why Each Wrong Option is Incorrect**
**Option A:** Is incorrect because the specific type is not provided.
**Option B:** Is incorrect because the specific type is not provided.
**Option C:** Is incorrect because the specific type is not provided.
**Option D:** Is incorrect because the specific type is not provided.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that **early detection and treatment** of congenital cataracts are crucial to prevent long-term visual impairment.

**Correct Answer:** D. Lamellar cataract