**Core Concept**
Retinoschisis is a retinal disorder characterized by the splitting of the retina into two or more layers. This condition can be associated with various ocular and systemic abnormalities. The pathophysiology of retinoschisis involves the degeneration of retinal cells and the disruption of the retinal architecture.

**Why the Correct Answer is Right**
Retinoschisis is typically characterized by the presence of a retinal detachment, which is a separation of the neurosensory retina from the retinal pigment epithelium. This is often accompanied by the presence of retinal folds and atrophic changes in the retina. The condition can also be associated with the presence of lattice degeneration, which is a characteristic pattern of retinal atrophy.

**Why Each Wrong Option is Incorrect**
**Option A:** Retinal thinning is a feature of retinoschisis, as the condition involves the degeneration of retinal cells and the disruption of the retinal architecture.
**Option B:** Retinal detachment is a characteristic feature of retinoschisis, which involves the separation of the neurosensory retina from the retinal pigment epithelium.
**Option C:** Lattice degeneration is a characteristic pattern of retinal atrophy associated with retinoschisis, and is often seen in conjunction with the condition.

**Clinical Pearl / High-Yield Fact**
Retinoschisis is often associated with other ocular and systemic abnormalities, including myopia, vitreoretinal degeneration, and systemic genetic disorders such as X-linked retinoschisis. A high index of suspicion for these conditions is essential in the diagnosis and management of retinoschisis.

**Correct Answer: D.**