Description | Roth’s 28 Hue test studies the characteristic axies of dyschromatopsia similar to the Farnsworth D15, however this 28 hue test provides a greater degree of sensitivity. Case comes with a transparent base to make scoring more readable. Kit includes | HRR 4th edition pseudoisochromatic test from Richmond Products includes the four demonstration plates, the six screener plates and the 14 diagnostic series for a total of 24 plates. Each of these plates has its own tab for easy and clean page | Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness of two type total color blindness and red/green blindness. This book is used for children and the illiterate. | Accepted by leading authorities as a simple and accurate method for discovering congenital color blindness of two type total color blindness and red/green blindness. This book is used for children and the illiterate. | 70 discs to investigate acquired color deficiency. Quantifies neutral zone characteristics of dyschromatopsia and evaluates the relative luminance. |