Richmond Products, based in Albuquerque, New Mexico, will continue to operate with its current staff from its current location where it provides over 2,000 vision testing products including a color vision test, the HRR Pseudoisochromatic Plate
Test 4th Edition.
Piccinin MR, Cunha JF, de Almeida HP et al: Low prevalence of dyschromatopsia using the fourth edition of HRR (Hardy, Rand & Rittler) pseudoisochromatic plate
test among the Indian Population of Lalima village, Terena.
67-69) The studies that have looked at the effectiveness of this lens agree that it improves performance of colour deficient subjects on pseudoisochromatic plate tests.
In both instances, colour vision is initially assessed using the Ishihara pseudoisochromatic plates.
The improvement of performance on pseudoisochromatic plates with a monocular coloured filter:
c) Improves performance on pseudoisochromatic plates
Colour Vision Testing Made Easy (Figure 8) test is a pseudoisochromatic plate test designed to screen children for red-green colour vision deficiencies.
13) The design of the Ishihara pseudoisochromatic plates is based on the plates of Stilling.
Hardy-Rand-Rittler pseudoisochromatic plates The original edition of the Hardy-Rand-Rittler (HRR) pseudoisochromatic plates (American Optical HRR) is no longer available.
The test includes several pseudoisochromatic plates
, each composed of a pattern of differently shaded dots.