11. CONE adaptation
Visual adaptation to lower luminance levels is affected in some hereditary disorders of the retina. The speed of adaptation can be assessed by using the CONE Adaptation test. It requires training to teach the child to sort the white, blue and red chips, each colour in a separate pile. Training and preliminary testing can be a part of a play situation.
"Let's mix these pieces and then you give them one by one to Mother and to me. Give Mother the white ones."