What is primarily evaluated using the Duochrome test?

The Duochrome test is primarily designed to evaluate a patient's refractive error, specifically focusing on astigmatism and its correction. The test utilizes two colored backgrounds—typically red and green—and presents them to the patient along with a visual target, allowing them to determine which color appears to show the letters or symbols most clearly. This test helps in identifying the presence of astigmatism by highlighting how the patient perceives clarity of visual targets on different colored backgrounds.

While myopia severity is a concern in overall refractive assessments, the Duochrome test itself specifically aids in determining the best refractive correction for astigmatism, making it a key tool in refractive error evaluation rather than a direct measure of myopia. Therefore, the central function of the Duochrome test is more accurately aligned with assessing astigmatism rather than myopia severity.