**Core Concept**
The postero-superior retraction pocket is a condition characterized by the progressive migration of the superior rectus muscle, which can lead to various ocular and adnexal complications. This phenomenon is often associated with chronic ocular inflammation, particularly in patients with Graves' disease.

**Why the Correct Answer is Right**
The progression of the postero-superior retraction pocket results in the displacement of the globe, leading to exposure of the posterior segment. This can cause a secondary glaucoma due to the increased intraocular pressure (IOP) and also lead to optic nerve damage. The retraction pocket can also cause exposure of the optic nerve head, which can result in optic nerve atrophy and vision loss.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not directly relate to the consequences of a postero-superior retraction pocket. While corneal exposure can occur, it is not the primary complication associated with this condition.

**Option B:** This option is incorrect as it refers to a different condition, which is more commonly associated with a different type of retraction pocket.

**Option C:** This option is incorrect as it is not directly related to the postero-superior retraction pocket.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of the postero-superior retraction pocket is the exposure of the optic nerve head, which can be a sign of impending optic nerve damage. Early recognition and treatment are essential to prevent vision loss.

**Correct Answer: C. Secondary glaucoma and optic nerve damage.**