The Ypsilanti daily press. (Ypsilanti, Mich.) 1928-1962, 1942-12-07


have been reported in women but
all of these reports are subject to
some criticism. In the eNamina-
ton of candidates as railway en-
ployces. it has been found that
about . per cent are more or less
color-h.ld.
In the eye are three kinds Of
nerve fibers which respond to color
sensations. Stimulation Of one
produces the sensation Of red;
stimulation OF the second, green,
and Of the third, the sensation Of
violet. Sensations Of orange, yell
low and blue are produced by diff
ferent combinations Of the stimu-
lation Of these three primary
fibers. Thus, yellow results from
the stimulation Of red and green
tibers and blue results from the
stimulation of green and violet
tibers.
Total color blindness is very
rare. The perception of colors is
absolutely wanting the individ-
gal being able to perceive the diff
ference between darkness and
light but not variations in the in
tensity Of light. Partial or incom-
plete color blindness may have to
do with red, green or violet blind
ness, but usually the indiy Il
mixes up reds and greens.
Some Unaware
The color-blind person lives in
a peculiar world. Often he may be
unaware Of this popularity until
late in life A doctor wrote in to
an oculist saying that his wife
thought he was deficient in color
perception. The oculist sent him
some test worsteds and asked him
10 match fram. The matches he
sent in were very amusing, fully
substantiating the lady's opinion
and diagnosis.
Dalton, who first described col
or blindness in his own person,
said; Scarlet. in most cases, |
can distinguish. but a dark bottle
green | could not, with certainty,
from brown. Dark yellow l know;
light yellows | might confuse with
light browns, though in most cases
l think | would know them from
red" Color-blind people are not
able to distinguish red fruits, such
as cherries, from the leaves Of the
tree. The color-blind person has
been known to appear on the
streets with one green and one
brown glove.
A number Of correspondents
have written me, asking whether
vitamin A viii improve color
blindness. It will not. The only
thing vitamin A does is to improve
the retina for night blindness,
Traffic Clinic
Some years ago it was proposed
that all motorists should be exam
ined to see whether they were
color-hlind. This, however, is un-
necessary. | quote from DR.. Lowell
S. Selling, who conducts the Traf-
fic Clinic in Detroit:
Il have pointed out that color
vision does not seem to be impor-
tant in the matter Of safe driv-
ing. Color blindness was offered
me as one Of the arguments for
setting Up the Traffic Clinic. We
maintained that the color-blind
individual probably could not dis
tinguish green from red lights.
This has proved to be fallacious.
Practically. color-blind people dis
eliminate the lights first Of all
from their position on the stand
ard in those towns where this po-
sition Is constant. Second, the
amount of brightness in the green
and red lenses differs in a recog-
nizabla degree. Third. these per-
sons seem to learn 20 make use Of
cues from other drivers and from
the situation in general"
QUESTIONS AND ANSWERS
NJ F. As it possible for
anyone who has punctured mis- ear
drum TO hear in tina. ear again7
Answer: Yes, most people who
have had a punctured ear drum
were able to hear perfectly after it
healed.
won't be friction, but If it doesn't
mean competition, there no good
In guessing.
Herbert Hoover's mentioned as n
corking good man to handle our
end Of the argument, but he isn't
Of the right politics. He probably
alsn't Of the right economies for the
present administration, either. He
is too darnei International, 10
weigh In an International issue.