40
Operation
of
the
device
Positioning
the
patient
•
Ask
your
patient
to
sit
down
in
front
of
the
phoropter
or
bring
the
phoropter
into
position
in
front
of
the
patient.
The
patient
has
to
be
sitting
comfortably
and
lean
his
head
onto
the
middle
of
the
forehead
rest
(
9
,
Fig.
5).
Pay
attention
to
ensure
that
the
head
is
in
an
upright
position.
•
Adjust
the
corneal
vertex
distance
(CVD)
to
17
mm.
To
do
this,
look
through
the
control
window
(
1
,
Fig.
21).
Position
yourself
so
that
the
solid
reference
line
(
3
,
Fig.
21)
for
the
scale
included
in
the
deflecting
mirror
rests
between
the
two
triangles
(
4
,
Fig.
21).
Correct
the
position
of
the
forehead
rest
using
the
adjusting
screw
(
2
,
Fig.
21)
until
the
vertex
of
the
patient’s
eye
(
5
,
Fig.
21)
rests
on
the
left
line
of
the
displayed
scale.
•
Also
check
the
corneal
vertex
distance
for
the
other
eye.
It
may
be
that
you
have
to
ask
the
patient
to
move
his/her
head
several
times.
•
Check
the
pupil
distance
(PD)
that
has
been
set
up
using
the
reticules
that
have
been
swiveled
in.
If
necessary,
correct
the
PD
using
the
control
software.
000000-2075-933-GA-en-GB-230822
