Which of the following tests can detect blue-yellow and red-green deficiencies?

The HRR (Hardy-Rand-Rittler) plates are designed to detect both red-green and blue-yellow color deficiencies. This test utilizes a series of colored plates with patterns that can reveal deficiencies by incorporating colors that may not be distinguishable for someone with these types of visual impairments. The method involves using colored dots that blend into a background in such a way that individuals with color vision deficiencies struggle to perceive the correct pattern.

The presence of both types of color deficiency can be identified as the HRR plates provide specific testing stimuli for each category. When a person with normal color vision looks at these plates, they can easily discern the patterns, while those with color vision deficiencies may see different patterns or no pattern at all, thus allowing for a comprehensive assessment of color vision capabilities.

In contrast, other tests listed tend to be specific to certain types of deficiencies. The Farnsworth D-15 Test focuses on arranging colored caps in a sequence and primarily assesses red-green color deficiencies. The Ishihara test is primarily designed to detect red-green color deficiencies, mainly found in cases of color blindness. The Nagel anomaloscope is a specialized test for red-green deficiency specifically and does not evaluate blue-yellow deficiencies. This distinction highlights why the HRR plates are