**Core Concept**
Anisometropia is a condition where there is a significant difference in the refractive power between the two eyes, often resulting in amblyopia or reduced visual acuity. This disparity can be caused by varying degrees of myopia, hyperopia, or astigmatism between the two eyes.

**Why the Correct Answer is Right**
The primary goal of treating anisometropia is to eliminate or minimize the refractive difference between the two eyes. This is typically achieved through corrective eyewear, such as glasses or contact lenses, which are prescribed based on the individual's specific refractive errors. The exact prescription depends on the type and degree of anisometropia, as well as the patient's age and overall eye health. In some cases, orthokeratology (OK) or refractive surgery may be considered to correct the underlying refractive errors.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not address the underlying refractive difference between the two eyes, which is the primary goal of treating anisometropia.
**Option B:** This option is incorrect because it is a nonspecific term that does not directly relate to the treatment of anisometropia. While vision therapy may be beneficial for certain types of amblyopia or vision development issues, it is not the primary treatment for anisometropia.
**Option C:** This option is incorrect because it is a surgical procedure that is typically reserved for more severe cases of anisometropia or other refractive errors, such as high myopia or astigmatism.

**Clinical Pearl / High-Yield Fact**
It's essential to note that treating anisometropia requires a comprehensive eye exam to accurately determine the refractive errors and prescribe the correct corrective eyewear. Early detection and treatment are crucial to prevent amblyopia and optimize visual outcomes.

**Correct Answer:** D.