Which of the following examinations assesses a patient's color perception and aids in detecting color blindness?

The Ishihara test is specifically designed to assess a patient's color perception and is widely recognized as a standard tool for detecting color blindness. It consists of a series of colored plates, each displaying a number or pattern that can be seen clearly by individuals with normal color vision but may be difficult or impossible to discern for those with color vision deficiencies.

This test targets the most common forms of color blindness, primarily red-green deficiencies, providing a straightforward way to evaluate how the patient sees colors. By identifying discrepancies in color detection, the Ishihara test helps in understanding the patient's visual capabilities and the potential need for adjustments in their environment or occupation based on their color perception.

In contrast, the Snellen test specifically measures visual acuity, which refers to the clarity of vision and does not assess color perception. The pupil reaction test evaluates the reflexes of pupils to light but does not provide insights into color vision. Lastly, a fundoscopic examination focuses on the health of the retina and the optic nerve rather than assessing how a patient perceives different colors. Hence, the Ishihara test stands out as the most appropriate examination for determining color blindness.