Certified Paraoptometric (CPO) Practice Exam

Question: 1 / 400

What should be tested to determine color vision deficiency?

Ishihara plates

The Ishihara plates are specifically designed for testing color vision deficiency, making them the appropriate choice for this question. These plates consist of a series of colored dots arranged in such a way that numbers or shapes can be discerned by individuals with normal color vision, but may be difficult or impossible to see for those with color vision deficiencies, such as red-green color blindness.

Other methods listed, like visual field tests, focus on different aspects of vision, such as detecting peripheral vision loss, rather than assessing color discrimination. Retinal scans provide detailed images of the retina but do not directly test color vision. Pupil response timing evaluates how the pupils react to light and does not relate to color perception. Thus, the use of Ishihara plates is the standard and most effective method for identifying color vision deficiencies.

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Visual field tests

Retinal scans

Pupil response timing

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