Certified Ophthalmic Assistant Practice Exam

Which of the following cannot be used for color vision testing?

1. Pseudoisochromatic plates

2. Hardy-Rand-Ritter plates

3. Nagel anomaloscope

4. Fly test

The correct answer is: Fly test

The Fly test cannot be used for color vision testing because it is not a recognized method or tool for assessing color vision deficiencies. The Fly test involves assessing the acuity of a patient in a way that is unrelated to color perception. On the other hand, options A, B, and C are valid tools for color vision testing: A. Pseudoisochromatic plates are commonly used for screening color vision deficiencies, such as Ishihara plates. B. Hardy-Rand-Ritter plates are also a type of pseudoisochromatic plates used for assessing color vision. C. The Nagel anomaloscope is a sophisticated instrument used for detailed color vision testing, particularly for determining the type of color vision deficiency a patient may have.