Question

Amsler's grid is used to evaluate?

• A. Central 10 degrees of vision
• B. Central 20 degrees of vision
• C. Peripheral vision
• D. Lens opacity

Hint:

A wavy-line chart that tests the macula.

Answer 1

The Correct Option is A

Step 1: The Amsler grid is a square chart of fine lines with a central fixation dot, used to test the function of the macula, which subtends the central 10 degrees of the visual field.

Step 2: The patient fixes on the central dot and reports any distortion. Bent, wavy or missing lines indicate metamorphopsia, in which objects appear to have an altered or irregular contour.

Step 3: Because it maps the central 10 degrees, the grid detects and follows macular disease such as central serous chorioretinopathy, age-related macular degeneration, diabetic macular oedema and macular hole. Hence the answer is central 10 degrees of vision.

Step 4: Peripheral vision is assessed by perimetry, and lens opacity by slit-lamp examination, so those options are incorrect.