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MANAGEMENT OF LIGHT AND CARE OF THE EYES. 173
cient for a short or medium length of window. But for a long
window, two shades that work independently of each other, are
desirable. One of these may be lowered from the top, the other
may be run up from below, enabling the operator to use any part
of his source of light he may desire at any moment and place it
on his work from high up or low down. Direct sunlight should
always be shut out. The light from the clear sky is the most
desirable light for dental operations. In all positions this should
fall directly upon the work, without shadows. The arrangement
should be such that a bright light will not fall in the operator's
eyes while actually engaged in any operation. In positions, at
the chair, right side in front, or left side in front, the operator's
back should be to the light, while it falls full upon his work. In
positions right side and left side behind, the arrangement of the
chair should be such that, with the inclination of the head of the
operator, the eyebrows will fully shade the eyes. There should
be no windows in the rear or to the sides in any well-arranged
dental office that will throw light into the eyes of the operator
in any position that is necessarily assumed in operating.
In schools where many students must be accommodated such
an arrangement is often impracticable, but even in these the
student may generally manage to avoid having a bright light
fall in his eyes by turning the operating chair into a favorable
position. In offices unfavorably lighted for these purposes much
may be done with suitably arranged window shades. A shade
made to raise from below will exclude rays of light that come
from too low a source, and confine the inlet higher up, or an
upper shade may change this to a lower source, etc. In a room
with several windows, certain ones may be closed by heavy
shades at certain times in the day and the light modified to suit
the time or position of the sun.

CARE OF THE EYES.
The care of the eyes should be a constant factor in the daily
routine of office practice or school work in dentistry. There are
few callings that are so taxing upon one 's eyes. Many men have
eyes just a shade off in focus so that long continued close appli-
cation becomes tiresome. This will not occur readily if the
adjustment is exactly what it should be. In any such case the
exact nature of the error in vision should be found promptly and
remedied by artificial means, i. e., properly adjusted glasses.
This will not only conduce to comfort and accuracy of work, but