32
11.
Rest the palm of the hand holding the immersion shell on the patient
’
s forehead to reduce
shell pressure on the eye. This position allows the palm to act as a pivot point for the shell.
If necessary, the operator can stabilize the shell with the other hand and make micro
-
adjustments. A tissue may be placed on the temporal canthus to catch any excess saline.
12.
Use the saline reservoir to slowly inject saline into the shell. As soon as the liquid fills the
shell sufficiently to reach the tip of the transducer (about 2cc), a beep rate of approximately
once per second will be heard. This means that coupling has been achieved and sound
pulses are being transmitted through the eye. A higher tone beep indicates when the probe
is properly aligned.
13.
In
Auto Measurement Mode
, a measurement is automatically recorded when alignment
with the visual axis is detected. Typically, measurements will be obtained almost
instantaneously. AXL, ACD and LT measurements are ranked and placed in the
measurement bank. If the unit is configured for the
“
Aphakic
”
lens type, only AXL
measurements will be given.
If a measurement is not obtained successfully when the saline is injected, and/or the beep
rate is still low, then the probe is out of alignment. Gently move the shell around the sphere
of the eye to bring the line of the probe into alignment with the visual axis. The beep rate
will increase as the probe approaches alignment with the visual axis.
NOTE:
Refer to the
Alignment Ranking System
section for information on how
measurements are evaluated during Auto Measurement Mode.
In
Manual Measurement Mode
, a measurement is only recorded in the measurement bank
if the user presses the
Enter
key (on the keyboard) or
Right Foot Pedal
(accessory).
Measurements manually placed in the measurement bank are given a
“
MAN
”
ranking.
NOTE:
It is possible to acquire a video in Manual Measurement Mode and then enter
measurements during replay of the video. Refer to the
Reviewing A
-
Scan Videos and
Measurements
section.
14.
Scanning is stopped as follows:
In
Auto Measurement Mode
, the scan will stop automatically as soon as eight (8)
measurements are obtained that meet the alignment ranking and standard deviation
requirements. Scans can also be aborted manually (as stated below).
In
Manual Measurement Mode
, scans must be stopped manually.
To Stop scanning
†:
-
Click the
[STOP SCAN]
button; or
-
Press the
Space Bar
(on the keyboard); or
-
Press the
Foot Pedal
(Single Pedal accessory); or
-
Press the
Left Foot Pedal
(Double Pedal accessory)
15.
After measurements are obtained, remove the shell from the patient
’
s eye. Direct the
patient to look straight ahead during removal. Raise the patient
’
s upper eyelid, which
releases the top part of the shell from under the eyelid. Then pivot the shell downward,
directing the patient to continue to look straight ahead. Then pull the shell away from the
eye without contacting the cornea. Upon the initial release, the remaining contents of the
shell
(1
—
3
cc of liquid) will spill out. Be prepared with a towel or tissue.
16.
If measurements of the other eye are needed, click the
[CHANGE EYE]
†
button and repeat
steps
1
—
15.
†
This command may be executed through voice control. Refer to the
A
-
Scan Voice Controls
section.
