People who are color-blind look peculiar to people who aren’t, according to the textbook Color-Vision and Color-Blindness: A Practical Manual for Railroad Surgeons, by John Ellis Jennings, F.A. Davis (publishers), Philadelphia, 1895. The book explains on page 42:
Peculiar Look Of The Color-blind.
A peculiar look of the color-blind was first noticed by Professor Wilson, of Edinburgh, and described by him as “an absent, anxious glance,” as “a startled, restless look,” and as ” an eager, prying, aimless air.” Dr. B. Joy Jeffries has observed this peculiar look in a number of color-blind. He describes it as ” a certain liquid look, as if the eyes were slightly suffused. . . It gives the color-blind person the appearance of not listening or not being interested in what is said to him.”