Which of these tests would you use to check for visual acuity?

The Snellen test is specifically designed to assess visual acuity, which is the clarity or sharpness of vision. This test uses letters arranged in a standardized format on an eye chart, typically with varying sizes, to determine how well a person can see at a distance. The results are expressed as a fraction where the numerator indicates the distance from the chart (usually 20 feet), and the denominator indicates the smallest size of the letters that can be discerned by a person with normal vision at that distance.

In contrast, the other tests listed serve different purposes: the Schirmer test evaluates tear production, the Wirt test (often associated with the Wirt circles) is used primarily to assess depth perception and binocular vision, and cycloplegic tests are used to temporarily paralyze the ciliary muscle of the eye for assessing refractive errors. Therefore, the Snellen test is the most appropriate choice for specifically checking visual acuity.