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'~EDEYEn
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"Red
eye
,"
an
optical
phenomenon
in which a subject's
eyes
appear
red
in
photographs
taken
with a flash
unit, is a result of
the
flash light's
directly
illuminat-
ing
the
retina
. This
happens
when
the
subject
looks
straight
into
the
camera
on
which a flash unit is
mounted
.
The
effect
becomes
more
pronounced
if
there
is little
or
no
ambient
light. In this
case
,
the
pupil
of
the
eye
is wide
open,
and
the
illuminated retina is
clearly
visible.
To
avoid
"red
eye
" you
can
take
any
or
all of
the
follow-
ing
steps:
1.
Brighten
the
room
to minimize
the
opening
of
the
subject
's
pupils.
2. Instruct
the
subject
not to look straight into
the
camera
.
3.
Keep
the
flash
unit
as
far away
as
possible from
the
camera
by
means
of a
sync
cord
.
Note
that
once
"red
eye"
appears,
there
is
no
way of
retouching
the
negatives.
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