Dodge City times. [volume] (Dodge City, Kan.) 1876-1892, 1883-12-27
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vice versa, he needs 3
lass for that eye, set at an
determined hyseeipg which
e wheel is the blacklist. This
called astigmatism, and is be-
to be quite common
most valuable instrument to the
st was discovered by q man who
not an oculist. There was con-
Herable discussion among the scien-
.ists of Germany as to the cause of the
| red light .emanating from the eyes Of
animals and men in a dark room. One
man discovered that the light was only
visible when directly on level with
and in front of the eye. x T-aE
Helmholz took small concaye mir
ror and scratched the s;lvering off the
back so as to make a little pecp-hole in
it. A beam of light was allowed on the
mirror and reflected back into the SUBJ
iect's eve, and Helmholz could hook
through the little peep-hole and see the
interior of the eye. He thus found out
that the light was reflected from the
red surface of the reiina OF the eye,
but he also discovered an instrument
without which ocylists would be very
much handicapped. A young man,
named Ned Loring, has inventede very
valuable adjunct to the opthalmascope,
by which little lenses of various powers
and kinds are moved over the little hole
in the lack of the mirror so that the
operator can see what glasses are need
G by the owner Of the eve. When the
eye is incorrect the retina appears of a
dull red, which becomes distinct when
the right glass is used. An ivory indi-
dicator shows the number of the glass
used by the operator. Various diseases
can be detected by the appearance of
the retina of the eve. Affections Of Sac
kidneys. tumors and hemorrhages Of
the brain can be told from the color of
the retina.
In nearly the center of the retina is a
round spot of lighter color than the
rest This is where the nerve enters
the eve, and is supposed to be what is
called "the blind spot" This peculiar
spot can be detected by the following
figures:
Close the left eye, hold the newspaper
off at arms length and look steadily at
the round dot. Bring the paper nearer,
and when a few inches from The eye the
dagger will disappear. The rays of
light coming from it fall upon the blind
spot. and are not perceived.
Color blindness is defect that IS
quite common, although those afflicted
with it may go years without discover
ing it. Strange as it may seem, red
and green, the colors most easily de-
tected by the normal eye, are very fire.
quentIy confounded. Many people in
this city are unable 10 tell the ripe cher
ries on tree from the leaves except by
the shape and size. Colors are told by
these people more by the intensity of
the light than from the hue. Yellow is
a color that no one seems unable to
perceive, although red is sometimes
called yellow by the color-blind. Saw
ages perceive only the more vivid col
ors, and the percentage of color-blind-
ness among the colored children is far
greater than among the white. There
is no known remedy for color blindness,
nor is there a known cause. Dalton,
who first discovered the defect and was
himself thus afflicted, supposed it to be
due to a colored LIQUID in the eye, but
dissection after death failed to support
his hypothesis, AS his eyes were appar-
emily perfect There was deficiency
in the brain directly over and between
the eyes, which all the colcr-blind have.
Artists. whose perception of color is cx-
t~aordinary, have unusually prominent
foreheads at that point Cleveland Her
aid