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000000Ć1150Ć839 IOLMaster 11.02.2004
Axial length mode and keratometer
The test eye (
2
), labeled with AL, R and the corresponding nominal
values and tolerances (
3
), serves for testing the axial length mode (AL)
and the keratometer (R).
If the obtained measured values (with keratometer: the radius) are
within the tolerance range (
3
) specified on the holder, the instrument
is correctly calibrated.
Anterior chamber depth mode
The (larger) test eye (
2
) located at the side of the test eye holder (
1
),
which is labeled with VKT (ACD), nominal value and tolerance, serves
for testing the anterior chamber depth mode.
The structure of this lens simulates the cornea. Therefore, it must be
clean and free of film. If necessary, wipe it using a dry cloth.
If the obtained measured values are within the specified tolerance
range, the anterior chamber depth meter works correctly.
Explanation
When you test the axial length mode and the keratometer, it does not
matter which side (right or left on simulated eye) is used, as the optical
paths for the measurement are axisymmetric. When testing the anterior
chamber depth meter, however, it is advisable to turn the asymmetrical
holder (
4
) and perform the test also for the other side. For the
comparison of rightĆhand and leftĆhand side, however, make sure that
in both tests the test eye (
2
) is exactly perpendicular in front of the
instrument.
View the video image to check if the adjustment criteria for an optimal
optical section are met
(--> How to adjust the instrument, p. 71
).
Note:
The test eyes are excellently suitable also for training the
operation of the IOLMaster.
The "Test Eye" mode can be deactivated again via
Options
menu,
Test
eye
. If you enter a new patient (
<N>
or appropriate icon), this will be done
automatically.
Fig. 74 Testing the anteriorĆ
chamber depth mode
2
1
Test eye holder
2
Test eye for ACD; labeled VKT
3
Nominal values and tolerances
4
Asymmetrical holder
5
Mounting hole
3
4
5
1
Care and maintenance
