**Core Concept**
LASIK is a type of refractive surgery that aims to correct vision by reshaping the cornea, the clear dome-shaped surface at the front of the eye. It utilizes an excimer laser to remove or reshape tissue, thereby changing the way the eye focuses light.

**Why the Correct Answer is Right**
LASIK is effective in treating myopia (nearsightedness), astigmatism, and hypermetropia (farsightedness) by altering the corneal curvature. In myopia, the cornea is too steep, causing light to focus in front of the retina. In astigmatism, the cornea or lens is irregularly shaped, leading to blurred vision at all distances. In hypermetropia, the cornea is too flat, resulting in light focusing behind the retina. By reshaping the cornea using LASIK, these refractive errors can be corrected.

**Why Each Wrong Option is Incorrect**
**Option A:** While LASIK is primarily used to treat myopia, it's not the only option for correcting nearsightedness. Other refractive surgeries, such as PRK (photorefractive keratectomy), can also be used for myopia correction.
**Option B:** Astigmatism can be treated with LASIK, but it's not the most common indication. Toric IOLs (intraocular lenses) or other refractive procedures might be preferred for astigmatism correction.
**Option C:** Hypermetropia can be corrected with LASIK, but it's often a less common indication compared to myopia. Other refractive surgeries, such as PRK, can also be used for farsightedness correction.

**Clinical Pearl / High-Yield Fact**
When considering LASIK for refractive correction, it's essential to note that patients with significant dry eye syndrome, thin corneas, or other ocular surface diseases may not be ideal candidates. A thorough preoperative evaluation is crucial to determine the best course of treatment.

**✓ Correct Answer: D. All of the above**