Haag-Streit LENSTAR LS 900 Mode D'emploi page 7

capabilities of EyeSuite.
• Please keep this manual near the appliance at all times, in a place
where it can be accessed easily by operating staff. Warranty claims
will only be considered if the instructions in the operating manual
have been followed as specified.
• Execute function checks when prompted by software (measure-
ment properties, side recognition)
• Shut down the computer whenever the system is to be out of use
for an extended period.
. Plausibility of measurements
• Users should check measurement readings for plausibility. This
involves verifying the A-scan and the cursor, which is automatically
adjusted with respect to signal peaks, whenever the LS 900
an abnormally-high standard deviation for axial eye length, corneal
thickness, anterior chamber depth and/or lens thickness. The opera-
tor should also take into account the type (e.g. posterior subcapsular
cataract) and density of the cataract when evaluating plausibility.
• Measurement readings obtained from patients with a non-intact
cornea (e.g. due to a corneal transplant, corneal opacity or corneal
scarring) may possibly be inaccurate (this applies to keratometry in
particular), and the user should check the data for plausibility.
• We recommended the carrying-out of five measurements on each
eye.
• The user should ensure, before carrying out the measurement
procedure, that the patient is not wearing contact lenses, as their
presence is likely to give rise to incorrect measurement readings.
• It may not be possible, under certain circumstances, to carry out
measurements on persons with fixation problems.
• Dense lenticular opacities may make it impossible to measure the
axial eye length and lens thickness.
• Pronounced opacities of the central cornea can likewise make it
impossible to measure corneal thickness, anterior chamber depth,
lens thickness or axial eye length.
• Blood in the vitreous may make it impossible to measure the axial
eye length.
• Keratometry may be erroneous in eyes that underwent keratore-
fractive surgery because such eyes may significantly deviate from
spherical surfaces.
• The user should make a visual check, when carrying out the
measurement procedure, to ensure that all light spots are present.
• If the appliance repeatedly generates error messages, stop using
it and contact customer service.
• You are recommended always to examine both the patient's eyes.
The user should subject the measurement readings to extra scrutiny
if there is a notable difference between the right and left eye. The
following are classed as notable differences:
- More than 1 dpt with respect to central corneal refractive pow-
er -> 0.18 mm difference with respect to the corneal curvature
radius
- More than 0.3 mm with respect to axial eye length
- More than 1 dpt with respect to emmetropic IOL refractive po-
wer
• The user should check the A-scan when measuring anterior cham-
ber depth in pseudophakic mode. If only one IOL signal is visible, it
is not clear whether this signal relates to the front or back of the IOL.
Uncertainty in this case can lead to the displayed reading for anterior
chamber depth being inaccurate by the thickness of the IOL (approx.
+/-1 mm).
• An excessively tilted or decentered IOL may make it impossible
to measure the anterior chamber depth and aqueous depth in pseu-
dophakic eyes.
• An intraocular pressure reading corrected on the basis of the
measured corneal thickness does not in itself constitute a reliable
diagnosis of glaucoma.
• Ambient light has a bearing on pupil-diameter measurement rea-
dings. The user is responsible for ensuring the correct level of ambi-
displays
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