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DEUTSCH
ENGLISH
FRANÇAIS
ITALIANO
ESPAÑOL
NEDERLANDS
PORTUGUÊS
SVENSKA
© HAAG‑STREIT AG, 3098 Koeniz, Switzerland ‑ HS‑Doc. no. 1500.7220055‑04150 – 2022 – 09
wise, make sure that the device is switched off before attaching the
dust cover.
• Repairs may only be conducted by suitably trained and authorised
specialist personnel. Incorrect repairs can pose considerable risks
for operating staff and patients.
• Only original spare parts and original accessories may be used for
repairs.
• The software must be installed by trained personnel.
• The optional T-Cone may only be used with the Lenstar.
• The optional T-Cone may only be used with Lenstar devices with a
serial number of ≥ 2000 or Lenstar devices converted to white light
illumination.
• The optional T-Cone must be checked for damage before use.
• The optional T-Cone must not be exposed to strong direct sunlight.
• If unexpected disturbances are observed which manifest themselves
as communication problems between LS 900 and EyeSuite soft-
ware, the cause could be a cell phone or radio frequency telephone
in the immediate vicinity to the LS 900 or its power supply. Increase
the distance to the device until the interference disappears.
• The communication between LS 900 and PC may be interrupted, if
the device is exposed to a mains power supply delivering excess-
ively transient disturbances or short voltage interruptions. If this hap-
pens, the PC needs to be restarted and the measurement has to be
repeated.
1.6 Plausibility of the measurements
WARNING!
• Users must check measurement readings for plausibility. This in-
cludes the checking of the A-scan and the cursors, which automatic-
ally adjust to the signal, the keratometry values, the white-to-white
distance and the pupillometry, whenever one of the measurements
displays an unusually high standard deviation. The operator must
also take into account the type (e.g., posterior subcapsular cataract)
and density of the cataract when evaluating plausibility.
• Prior to the measurement, the user must verify that the patient is not
wearing contact lenses. Wearing contact lenses will result in erro-
neous measuring results.
• It may not be possible, under certain circumstances, to carry out
measurements on persons with fixation problems.
• In cases of thick cataracts and uncertain measurement of the axial
length, ultrasound biometry should be performed as a control exam-
ination.
• 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 im-
possible 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 have undergone ker-
atorefractive surgery because such eyes may significantly deviate
from spherical surfaces.
• The user should make a visual check when carrying out the meas-
urement procedure, to ensure that all light spots are present.
• If the device repeatedly generates error messages, stop using it and
contact the customer service.
• You are recommended always to examine both of the patient’s eyes
five times. The user should subject the measurement readings to ex-
tra scrutiny if there is a notable difference between the right and left
eye. The following are classed as notable differences:
◦ More than 1 D with respect to central corneal refractive power
=> 0.18 mm difference with respect to the corneal curvature radi-
us
◦ More than 0.3 mm with respect to axial eye length
◦ More than 1 D with respect to emmetropic IOL refractive power
• The user must check the A-Scan when measuring anterior chamber
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 anteri-
