Which method is primarily used to check for refractive errors?

The visual acuity test is essential for checking refractive errors because it evaluates how well a person can see at a distance and near. This test typically uses an eye chart with letters or symbols of varying sizes to determine the clarity of vision. If a person cannot see the letters clearly, it indicates a potential refractive error, such as nearsightedness, farsightedness, or astigmatism. The results help eye care professionals make decisions about how to correct the individual's vision, often through glasses or contact lenses.

Other methods, while important in their own contexts, do not primarily assess refractive errors. For instance, Schirmer's test evaluates tear production and is used to assess dry eye conditions but does not provide information about refractive status. Corneal topography maps the surface of the cornea to detect conditions like keratoconus but is not a direct measure of refractive errors. Fundoscopy examines the interior of the eye, primarily for detecting and monitoring diseases rather than measuring clarity of vision associated with refractive status.