**Core Concept**
Neurofibromatosis type 1 (NF1), also known as von Recklinghausen disease, is a genetic disorder characterized by the development of multiple neurofibromas, which are benign tumors that arise from nerve tissue. Ocular manifestations of NF1 are a significant aspect of the disease, affecting approximately 30% of patients.

**Why the Correct Answer is Right**
The ocular manifestations of NF1 include a range of abnormalities, including Lisch nodules, which are pigmented iris hamartomas that are present in nearly 100% of patients with NF1. These nodules are formed due to the proliferation of melanocytes in the iris stroma. Additionally, patients with NF1 are at an increased risk of developing optic gliomas, which are tumors that arise from the optic nerve and can cause visual loss and other complications.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not specify a known ocular manifestation of NF1. While NF1 can cause a range of systemic complications, this option is too vague to be correct.
**Option B:** This option is incorrect because it refers to a condition that is not typically associated with NF1. Neurofibromatosis type 2 (NF2) is a different genetic disorder that is characterized by the development of bilateral vestibular schwannomas, but it is not typically associated with the same range of ocular manifestations as NF1.

**Clinical Pearl / High-Yield Fact**
One important clinical pearl to remember is that Lisch nodules are a hallmark of NF1 and are present in nearly 100% of patients with the disease. This can be a useful diagnostic clue for clinicians when evaluating patients with suspected NF1.

**Correct Answer:** C. Optic gliomas are a recognized ocular manifestation of NF1, although Lisch nodules are more common and are considered a diagnostic hallmark of the disease.