PIA/GATF HRR Pseudoisochromatic Test
Well respected and recommended test for color vision deficiency (“color blindness”) used by several industries. The Fourth Edition of the HRR test is manufactured by Richmond Products, Inc.
The HRR was developed to serve a threefold purpose:
- as a screening test to separate those with defective color vision from those with normal color vision.
- as a qualitative diagnostic test to classify the type of color defect (whether protan or deutan, tritan or tetartan)
- as a quantitative test to indicate the degree of any defective color vision (whether mild, medium or strong).
The HRR test supports very efficient color deficiency screening. The first four plates are used to show the patient how the test works. A camel's hair brush is provided for the patient to trace perceived patterns and avoid the deleterious affects of fingerprints. The fourth plate in this demonstration series has no pattern in order to detect for shirkers. The next six plates provide screening by presenting the most difficult yellow, blue, red, and green colors. Success with these plates defines the subject as having 'normal color vision' and completes the test for that person. Subsequent plates appear increasingly bold in color to test for increasing color deficiency.
