QUEER VISION DEFECT.

Stratford Evening Post, Volume XXXI, Issue 41, 3 October 1911, Page 3

QUEER VISION DEFECT.

In a recent discussion before the Royal Society of the phenomenon of “tricliroinic vision,” the case of a scientist, known for his researches in electrical science, was described. When looking at the bright spectrum of sunlight this scientist sees only three colours—red, green, and violet, for him there is no definite colour in the part of the spectrum that appears to persons with nominal vision pure blue, lie can distinguish nothing of the nature of pure yellow iu the spectrum. Reddish green would describe the orange and yellow parts, and greenish violet the blue parts as be sees them. In testing with coloured yarns the wool changed colour to him when contrasted, although a normal sighted person saw no difference. These facts show how different our favourite colours may possibly appear to some of our friends.—Popular Science Siftings.