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Glare
can
best
be
described
as
the
'over-stimulation'
of
the
human
eye,
caused
by
too
large
contrasts
in
light
intensity,
colors
and
luminance
of
the
interior
in
comparison
with
the
computer
screen.
The
human
eye
can
adapt
up
to
a
maximum
limit
of
1
to
10,
and
contrasts
between
1-6
and
1-10.
Being
exposed
to
larger
ratios
will
lead
to
discomfort,
weariness,
loss
of
concentration
and
loss
of
productivity.
There
are
actually
two
types
of
glare
that
can
be
distinguished:
disability
glare,
completely
impairing
vision
and
discomfort
glare,
causing
discomfort
and
weariness
of
the
eyes.
Discomfort
glare
is
the
most
common
in
our
daily
working
environment,
and
in
relation
to
windows
and
sun
shading,
it
is
determined
by
the
luminance
of
what
can
be
seen
from
the
window
by
the
occupant
of
an
office,
in
relation
to
the
luminance
of
the
interior
environment
and
the
object
that
is
being
observed,
in
most
cases
the
computer
screen.
It
is
generally
acknowledged,
that
for
computer
workstations
the
luminance
of
the
window
and
what
can
be
seen
from
the
window,
i.e.
the
sky,
buildings
opposite,
or
even
the
sun,
should
be
reduced
by
a
factor
10
in
order
to
provide
for
visual
comfort. This
general
rule
is
of
course
affected
by
many
parameters,
such
as
the
orientation
of
the
façade,
the
size
of
the
window,
the
distance
of
the
computer
from
the
window
and
its
position,
and
the
task
that
is
performed.
Another
phenomenon
that
has
an
influence
on
visual
comfort
when
performing
tasks
on
a
computer,
is
the
reflection
of
objects
or
bright
surfaces
in
the
interior
environment
on
the
computer
screen.
These
reflections
can
cause
a
loss
of
contrast
on
the
screen,
leading
to
a
deterioration
of
the
legibility
of
the
information,
which
in
turn
will
lead
to
discomfort.
Computer
work
puts
a
lot
of
strain
on
the
human
eye,
because
of
the
constant
changes
in
contrast
and
luminance,
but
also
because
of
the
differences
between
what
is
seen
on
the
computer
screen,
and
what
is
read
in
paperwork
on
the
desk.
If
apart
from
that,
glare
and
reflections
occur,
fatigue
will
quickly
set
in
and
lead
to
the
aforementioned
discomfort
and
loss
of
productivity.
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