**Core Concept**
An Amsler grid is a tool used in ophthalmology to assess the central visual field and detect any abnormalities in vision, particularly in patients with macular degeneration or other retinal disorders. The grid consists of a series of horizontal and vertical lines that help patients identify any distortions or blind spots in their vision.

**Why the Correct Answer is Right**
The Amsler grid is a simple yet effective tool that allows patients to report any visual disturbances, such as missing or distorted lines, which can be indicative of retinal problems. By using the Amsler grid, patients can identify any changes in their vision, enabling early detection and treatment of conditions like macular degeneration. This is particularly useful in patients with a family history of macular degeneration or other retinal disorders.

**Why Each Wrong Option is Incorrect**
**Option A:** The Amsler grid is not used in the assessment of peripheral vision, which is typically evaluated using a tangent screen or a visual field test.
**Option B:** The Amsler grid is not a diagnostic tool for glaucoma, which is typically assessed using a visual field test or a tonometer.
**Option C:** The Amsler grid is not used in the assessment of color vision, which is typically evaluated using a color vision test or a Ishihara chart.

**Clinical Pearl / High-Yield Fact**
The Amsler grid is a simple and non-invasive tool that can be used by patients to monitor their vision and detect any changes early, making it an essential tool in the management of macular degeneration and other retinal disorders.

**Correct Answer:** C. Visual acuity assessment