**Core Concept**
Childhood blindness can result from various causes, including infectious, congenital, and acquired conditions. These causes can lead to vision loss due to damage to the retina, optic nerve, or other parts of the visual pathway.

**Why the Correct Answer is Right**
The correct answer is **C.**. The most common causes of childhood blindness include:

* Congenital cataracts, which can be caused by genetic mutations or intrauterine infections
* Retinoblastoma, a malignant tumor of the retina
* Leukemia, a blood cancer that can affect the eyes
* Traumatic injuries, such as those caused by shaken baby syndrome
* Congenital glaucoma, a condition characterized by increased intraocular pressure
* Optic nerve hypoplasia, a condition where the optic nerve is underdeveloped

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so we cannot evaluate it.
**Option B:** This option is not provided, so we cannot evaluate it.
**Option D:** This option is not provided, so we cannot evaluate it.

**Clinical Pearl / High-Yield Fact**
A key aspect of childhood blindness is that many cases are preventable or treatable with early detection and intervention. For example, congenital cataracts can be surgically removed, and retinoblastoma can be treated with chemotherapy or radiation therapy.

**Correct Answer:** C.