Section 3
A-Scan Operation and Use
3
- 3
ENTERING PATIENT INFORMATION
Patient information including name,
identification number, K readings, and eye to be
examined can be stored within the EZ-S
CAN
memory. Only one patient may be stored at a
time, but the information will remain until
overwritten.
1. Touch the
[ PATIENT ]
key. Verify that the
Patient Screen appears (see Figure 3-4).
Figure 3-4 Patient Screen Display
2. Within the Patient Screen, enter information
for a new patient by touching the
[ NEW PAT ]
key or edit the existing
patient information by touching the
[ EDIT ]
key.
3. Enter the patient name by touching the
appropriate alphanumeric keys. When
finished entering the name, touch the
[ ENTER ]
key.
4. Enter the patient ID number, and touch the
[ ENTER ]
key when finished.
5. Enter the eye to be examined by touching
the
[ OD / OS ]
button to toggle between
right and left. When the correct eye has been
selected, touch the
[ ENTER ]
button.
6.
Enter the K1 and K2 readings touching
[ ENTER ]
after each reading. The K1 and
K2 readings may be entered in either
Diopters (range of 20.00D to 60.00D) or as
radius of curvature (range 5.63mm to
16.87mm). Touch the
[ DONE ]
button
when finished entering the patient
information.
WARNING
The EZ-Scan assumes a keratometer index of
refraction of 1.3375 for converting K readings.
If entering K readings in millimeters which were
obtained using a keratometer with a different
index, the values must first be manually
converted to Diopters and then entered.
Apply a drop of topical anesthetic to the eye that
is to be measured prior to performing the
A-scan.
DIRECT CONTACT MEASUREMENTS
The patient should be seated in a comfortable,
upright position preferably in an examination
chair with a headrest. If the scan is to be
performed using the "hand-held" method, the
headrest should be positioned comfortably
behind the patient's head in order to minimize
movement away from the probe.
If an applanating device is to be used, bring the
patient's forehead into contact with the cross bar
and rest the chin on the chin support. Adjust the
chin support so that the patient's eyes are
approximately 1" to 2" below the cross bar.
NOTE:
Applying excessive force to the probe
will cause discomfort to the patient and distort
the eye, resulting in incorrect measurements.
IMMERSION TECHNIQUE
The patient should be seated with their head
tilted slightly back. An ordinary chair is usually
all that is needed, although in certain difficult
cases, both patient and user will benefit from the
use of a regular examination chair with headrest.
Place a towel on the patient’s shoulder. Consult
the instructions supplied with the particular
immersion shell for further directions regarding
the proper use of the shell.
!
3.4
PATIENT PREPARATION
