What test illuminates the screen with a filter that is red on one side and green on the other?

Prepare for the JCAT Independent Practice Exam! Study with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

The test that illuminates the screen with a filter that is red on one side and green on the other is the Duochrome test. This test is used primarily to assess a person's refractive error and to check for good visual acuity. The name itself hints at the two colors involved in the test (duo meaning two, and chrome referring to color).

The Duochrome test works on the principle that different wavelengths of light are focused differently by the eye. By alternating between the red and green sides of the filter, the test helps determine the eye's focusing ability. Patients are asked to indicate which color appears clearer, which aids in determining whether a prescription for corrective lenses is needed. The contrast between the two colors allows for a more refined assessment of visual acuity.

In contrast, the Worth four-dot test is primarily used to evaluate binocular vision, the Ishihara test is designed for color vision deficiency assessment, and the Maddox test is used to assess phoria and the alignment of the eyes. Each of these tests has its specific purpose and method of evaluation, but the distinct use of the red and green filter makes the Duochrome test unique in its application for measuring refraction.

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