■
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3.4.2 Measurement
See the user’s manual of the AL-4000 for the actual measurement procedure.
This section describes the operations that can be performed with this instrument
during measurement.
■ The converted acoustic velocity directly affects the measurement data.
Check that the desired value is set before starting measurement.
■ Check the settings in contact mode and immersion mode before starting
measurement. In immersion mode, apply an ultrasound media such as
cornea protective agent so that the clearance between the cornea and the
contact section of the biometry probe is approximately 2.0 – 5.0 mm.
■ The automatic measurement function is an auxiliary function to take
measurements more easily. This is not a function for making actual
clinical judgments. The physician must examine the measurement result
before using it.
■ Be sure to touch the “New” button to delete all the measurement data of
the previous patient before measuring another patient. If new
measurement is started without deleting the previous data, the
measurement data of the previous patient may be included.
a) Setting gain
■ Settings made here are only effective for the eye currently selected.
Settings cannot be made for both eyes simultaneously. Complete
necessary settings for each eye.
Adjust the waveform height according to the gain settings. The gain and the waveform
height increases as the gain value increases.
(Fig. 1)
Touch the gain adjustment buttons (1) to change the gain. The setting continues
to change while the button is held. The set value is displayed in the gain display
(2).
(1)
(2)
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