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The Ishihara plates are specifically designed for color vision assessment and are widely recognized and used in clinical settings. These plates typically consist of a series of colored dot patterns that create numbers or shapes visible to individuals with normal color vision but difficult for those with color vision deficiencies, particularly red-green color blindness. This test effectively evaluates an individual's ability to distinguish between different colors based on their perception of color contrasts.

In contrast, while Farben plates are also used to evaluate color vision, they are less commonly utilized than Ishihara plates. RGB refers to the color model used in various digital displays but is not a specific testing method for assessing color vision. The Ann Arbor plates are not a recognized tool for evaluating color vision; thus, they do not serve the purpose intended in this context. The efficacy and simplicity of the Ishihara plates make them the preferred choice among color vision tests.