D-15 Test. Subset of the well-known Farnsworth 100 Hue Test. Intended for occupational evaluation and classification instead of in-depth study of color vision defects. contains a reference disc and fifteen numbered discs which make up an incomplete color circle. Patient arranges the discs and then evaluation of the patient’s arrangement separates ‘normal’ color perception from moderate and strong defects in deutan, protan or tritan axis color discrimination. Boxed in a clear plastic container for easy scoring, this kit includes instructions, non-latex gloves and laminated score card.