Biomedical Engineering Reference
In-Depth Information
father with
patient
Devices room
fixation monitor l.
fixation monitor ll.
look
axis
source of IR
light
halfporous
mirror
lead
switch
camera l.
small
supervisory
monitor
positioning
device
PC
doctor
Surgery
mother
Studio for
genaration of the
fixation images
camera ll.
Fig. 9
Block scheme of E.M.AN system
eyes the close one is 0.37 m. From the patient's point of view, they have the same
angular size. The monitors are displayed using a beam-splitter so that they have a
common optical axis and approximately the same brightness. The fixed image is the
face of the child's mother, who is captured on video in another room. The mother
has feedback in the form of another video camera that records the child's face giving
them visual communication.
1.3
Measuring System E.M.AN
Block scheme of the E.M.AN. system is presented in Fig.
9
. The child, with its head
fixed in the head-rest, sits in the first room (Fig.
10
a). The mother's face is shown on
the monitors. She sits in a separate room and is filmed and has another video camera
to communicate visually with the child. The measuring apparatus, fixed monitors
and a control station are in the measuring room (Fig.
10
b). The child's eye is filmed
separately.
An eccentric diaphragm with a NIR measuring ray source for invoking Purkinje
images and a retinal reflex is placed in front of the lens of the measuring camera
(Fig.
7
a). Before measuring, the physician in the service room sets the camera
position (Fig.
7
b) and starts measuring. A digital monochromatic camera DALSA
