Certified Paraoptometric (CPO) Exam – Practice Test & Study Guide 2025

The Ishihara plates are widely recognized as a standard tool for assessing color vision, particularly for identifying red-green color deficiencies, which are the most common types of color vision deficiencies. These plates consist of a series of colored dot patterns that form numbers or shapes that can only be seen clearly by individuals with normal color vision. When an individual with a color deficiency views these plates, they may struggle to differentiate the patterns, thus allowing for a straightforward and effective evaluation of their color perception ability.

While other methods such as the Farnsworth-Munsell 100 Hue Test are indeed valuable for a more comprehensive color vision assessment, focusing on the discriminative ability across a broader spectrum, the Ishihara plates are simpler and quicker to administer in a general screening context. Visual acuity charts mainly measure the clarity or sharpness of vision, rather than color discrimination, and color redundancy tests are not a standard terminology broadly accepted in color vision testing. Therefore, the use of Ishihara plates is the most common and practical method for color vision assessment.