Tomey AL-2000 - Page 25

AL-2000 Biometer & Pachymeter
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The AL-2000 can be set to measure the following types of eyes:
• Normal: Select when the lens nucleus of the patient’s eye is rather soft, e.g.,
incipient cataract.
• Dense cataract: Select when the lens nucleus of the patient’s eye is rather
hard, e.g., hypermature cataract.
• Aphakic: Select when the patient’s eye is aphakic.
• Pseudophakic: Select when the patient’s eye is pseudophakic.
1. Touch the
EEyyee ttyyppee
key (1) on the
measurement window (fig. 1) to display
the window shown in fig. 2.
2. Select the eye type (2) by touching the
desired option.
3. Touch the
VVeelloocciittyy
key (3) to change
the converted velocity for the selected
eye type (fig. 3).
4. Enter the converted velocity using the
number keys (4). See range of convert-
ed velocities below.
In the event of an erroneous entry,
touch the
DDeelleettee
key (5).
5. Press the
RReettuurrnn
key (6) to set the
entered value and advance to the next
entry. The cursor location indicates the
category of the next entry.
6. Press the
VVeelloocciittyy
key to return to the
screen shown in fig. 2.
7. Press the
EEyyee ttyyppee
key (1) to return to
the measurement window (fig. 1).
For aphakic eyes, ACD and LENS cannot
be measured. With a dense cataract, the
instrument sometimes does not identify a
wave shape behind the cataract due to
multiple echoes, and nothing is shown in
the LENS column.
Range of Converted Velocity
• Normal
Average axial length velocity: 1,500 m/s - 1,600 m/s
Lens velocity: 1,540 m/s - 1,740 m/s
Anterior chamber velocity: 1,430 m/s - 1,630 m/s
• Dense cataract
Average axial length velocity: 1,500 m/s - 1,600 m/s
Lens velocity: 1,540 m/s - 1,740 m/s
Anterior chamber velocity: 1,430 m/s - 1,630 m/s