**Core Concept**
Corneal transplantation, also known as keratoplasty, is a surgical procedure to replace part of the cornea with corneal tissue from a donor. The **cornea** is the transparent outer layer of the eye, and its integrity is crucial for clear vision.

**Why the Correct Answer is Right**
Since the correct answer options are not provided, I will explain the general concept. Corneal transplantation is performed to treat corneal blindness caused by infections, injuries, or dystrophies. The procedure involves removing the damaged corneal tissue and replacing it with healthy donor tissue.

**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation. However, incorrect options might include statements about the procedure being used to treat retinal diseases or being a simple outpatient procedure.
**Option B:** Similarly, without the specific option, it's difficult to provide a detailed explanation. However, incorrect options might include statements about the use of artificial corneas or the procedure being used to treat glaucoma.
**Option C:** Incorrect options might include statements about the procedure being used to treat cataracts or being a temporary solution.
**Option D:** Incorrect options might include statements about the procedure being used to treat macular degeneration or being a new, experimental technique.

**Clinical Pearl / High-Yield Fact**
Corneal transplantation is a highly successful procedure, with a high rate of graft survival and significant improvement in vision. However, it's essential to note that the procedure requires careful patient selection, precise surgical technique, and rigorous post-operative care to minimize the risk of complications.

**Correct Answer:**