The Double 15-Hue Test was designed to classify the types of congenital defective color vision as protan, deutan and tritan, and also to estimate its extent as strong(grade 3), medium(grade 2) and mild (grade 1) defects.
This is a paired dichotomous test: Test A and B. Test A is a modified Farnsworth´s Panel D-15 Test for separating the subject with strong defect from those with medium and mild defects, while Test B composing more desaturated color chips is used to separate the subject with mild defect from those with strong and medium defects.
The test was evaluated with 72 color defective students detected at two . high schools using Ishihara´s and the author´s pseudoisochromatic´ plates, and it was proved to be very helpful for qualitative and quantitative diagnosis of defective. color vision.
|