CONSERVING VISION
PROPER ILLUMINATION TREATED
(BY MAJOR C. F. ADAMS.)
Faulty-light, too much'or too little
er from the wrong direction are all
sources of discomfort. I remember
not long ago a school girl, fourteen or
fifteen years of age, consulted me for
headache and distress about the eyes.
I found that she had a retinitis and
suggested that it was due to faulty
light. She quickly remarked, “It can’t
be that; we have a Welsbach light of
eighty candle power and the room is
as bright as day.” My diagnosis was
confirmed.
Glare is very trying; the light
should never strike the eyes in front
or be reflected from glazed paper. Did
you ever observe in the summer time
how one squints while reading in the
open,' under the trees or in a boat?
That is caused by glare. One can
read with much more comfort with
the light coming from the side while
Indoors because the walls of the room
cut off the extra rays of light and pre
vent glare.
Artificial light. The problem to be
considered in lighting systems Is not
so much the procuring of a bright
light, but a light that will give the
greatest efficiency for a period of
three or four hours of work with the
least fatigue to the eye.
The Important factors la this prob
lems are the evenness of the illumi
nation and the diffuseness of the
light; the angle at which the light
falls on the object viewed; evenness
of the surface; the brightness; inten
sity and quality.
The ideal condition with regard to
distribution is to have the field of
vision uniformly illuminated, with the
light well diffused and no extremes
of surface brightness.
We use today four systems of ligh't-
ing systems and semi-indirect lighting
systems. At present in the proper il
lumination of a- room by sunlight, we
have been able to get the best condi
tions of distribution. Before it reach
es our skylights, sunlight has been
widely diffused, by innumerable reflec
tions and the window and skylight
themselves, acting as sources, have a
broad area and low intrinsic bril
liancy, all of which features contribute
toward giving the ideal condition of
distribution stated above, namely,
that the field of vision shall be uni
formly illuminated with light, well dif
fused and that there shall be no ex
tremes of surface brightness.
Of the systems of artificial lighting,
the best distribution effects, speaking
in general terms, are given by the in
direct systems. In that type of sys
tem the source is concealed from the
eye and the light is thrown against
the ceiling or some other diffusely re
flecting surface in such a way that it
suffers one or more reflections before
it reaches the eye. This systemkin
some respects most important to the
eye, gives the best approximation of
the distribution effects characteristic
of sunllgh tof any that have been de
vised.
WINSTON-SALEM HAS OPENED
DOORS TO SOLDIERS.
If there should ever be a call for
soldiers at Winston-Salem again ev
ery soldier now stationed at Camp
Greene would be eager to make the
trip. Stories have come back to the
camp from the forty-first guards, the
ordnance men and others stationed at
Winston-Salem, of the most wonderful
treatment from the people of that
city.
Sergeant Marcel Frank carried 900
copies of The Caduceu^ over to Win
ston-Salem on last Saturday and had
plenty of time to look about the place
as his supply was sold out in two
VISIT ATLANTA.
Sergeants Simon Hyneman and Ar
thur Merriman have letmned fjom a
trip to Atlanta, Ga., where they ac
companied a number of patients.
SEES ASHEVILLE.
Sergeant First Class Tate of the
registiar's office is with us again af
ter a short absence occasioned by a
trip to Asheville, N, C., with two dis
charged patients. On his return tiip
the sergeant made a short stop at his
former home at Waynesviile. ^
The direct lighting systems are de
signed to send the light directly to the
plane of work. Bright, rather than a
diffused light are ootain with the at
tending glare that is irritating to the
eyes. .
The semi-indirect systems are in
tended to represent a compromise be
tween the direct and indirect systems.
A part of the light is transmitted di-
icclly to the eye, through the trans
lucent reflector placed beneath the
source of light and a part is reflected
to the celling. This method cannot
compare in efficiency with the indirect
light.
In tests for loss of efficiency, when
the intensity and quality of the light
are equalized at the point of work,
the eye loses practically nothin|; in
efficiency as the result of three or
four hours’ work under daylight. It
loses enormously for the same period
under the system of direct lighting se
lected ^r our work and almost as
much under the system of semi-indi
rect lighting. Under the indirect sys
tem the eye loses little more than by
daylight.
The epect of quality of light on the
eye has been me subject of much dis
cussion and much misunderstanding.
There is a popular belief ^hat a col
ored light giv,es better' results ' for
seeing than a white light; some hold
ing that the kerosene flame furnishes
the ideal source of light. The color
of light is not as important as the
quality and amount. The student
lamp, burning kerosene, won its repu
tation over gas, its only competitor at
the time, by being a steadier light,
free from flickering and more readily
adjusted.
(EitfeTtia
Hatinnal
lank
C. B. ARMSTRONG
President
A. G. MYERS
Active Vice-President
W. H. ADAMS
Cashier^
(gastnnia, N. (H.
RESOURCES
$2,000,000.00
Checking Accounts Welcome
Everybody’s Going
to the
LIBERTY
DANCE
* TO BE GIVEN
Friday Evening, Dec. 6
AT THE '
AUDITORIUM
UNION
ORCHESTRA
Dancing from 8:15 to 11:30
Moonlight Waltz at 9:30
Gentlemen 50c. ladies Free.
ALL MODERN DaNCFS
Finest Dance Floor in
North Carolina
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