Remarks on the examination and classification of cases of colour-blindness (1879)
Berry, George Andreas, 1853-, Tweedy, John, 1849-1924, former owner, Royal College of Surgeons of England · Edinburgh : Oliver and Boyd · leaf 18
others yellow, green, and blue, as so many writers do, we should, owing to the paucity of names for the many hundred distinct im- pressions produced by light of different wave lengths, apply names given to about three-tenths, one-fiftieth, one-tenth, and one-twelfth respectively of the whole… … A' Fig. 2. exact colours for which blindness exists must correspond to two of these fundamental sensations : let us represent them by
Color Vision Defects
Internet Archive · Royal College of Surgeons of England · Public domain (published before 1931). Free to use for anything.
