| Description | 70 discs to investigate acquired color deficiency. Quantifies neutral zone characteristics of dyschromatopsia and evaluates the relative luminance. | These color vision tests have been designed by Dr Hahn for the screening, classifying the type and estimating the grade of color deficiency. These plates are designed to measure Red, Green, Blue, Yellow. They provide classification of strong, medium | 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. | New saturated disc test for detecting and grading acquired color deficiency. Requires only two minutes for quantitative estimation of saturation thresholds for bluish pigment colors. Highly sensitive to and specific for differences between normal and |