February 10th, 2014 | Posted by admin in Uncategorized - (Comments Off on Dyschromatopsia — Vintage Market Find)
Colored rectangles classified by subjects of different types:1 normal and Balfour …. 2 on that disk, the normal eye sees “DN”, the Dalton type only sees the D, the Seebeck-Nagel and Balfour types only see the N.