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© HAAG‑STREIT AG, 3098 Koeniz, Switzerland – HS‑Doc. no. 1500.7220686.04020 – 2. Edition / 2021 – 05
• If the patient has previously undergone cataract surgery, available
records should be consulted for plausibility check of the
measurement.
• Prior to the measurement, the user must verify that the patient is not
wearing contact lenses. Wearing contact lenses will result in
erroneous 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
examination.
• 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 have undergone
keratorefractive surgery because such eyes may significantly
deviate from spherical surfaces.
• If the device repeatedly generates error messages, stop using it and
contact the customer service. These signs must be strictly adhered
to, to ensure safe operation of the device and to avoid endangering
users and patients.
• You are recommended to always examine both of 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 D with respect to central corneal refractive power
=> 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 D with respect to emmetropic IOL refractive power
• The user must check the A and B-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 anterior chamber depth being inaccurate by the thickness of the
IOL (approx. ±1 mm).
• The measured corneal thickness is not intended as a basis for the
correction of intraocular pressure readings for diagnosing glaucoma.
• An excessively tilted or decentered IOL may make it impossible to
measure the anterior chamber depth, lens thickness and aqueous
depth.
• In young patients the signal from the crystalline lens might be low
and measurement of the anterior chamber depth, lens thickness and
aqueous depth might not be possible.
• Measurement readings obtained from patients with a non-intact
cornea (e.g., due to a corneal transplant, corneal opacity or corneal
scarring, etc.) may possibly be inaccurate (this applies to
keratometry in particular), and the user should check the data for
plausibility.
• Ambient light has an impact on pupil-diameter measurement
readings. The user is responsible for ensuring the correct level of
ambient light when carrying out pupillometry. The device does not
monitor ambient light, so do not use pupillometry as the decisive
factor when considering kerato-refractive surgery.
• Keratometry may not be accurate in eyes with keratoconus, and so
the user must verify its plausibility.
• The user must verify that the eye assignment (OD, OS) is correct for
the measured eye.
• The white-to-white distance reading is merely an indirect
measurement of the inner lateral dimensions of the anterior ocular
section. It therefore provides only approximate indications of the
actual inner lateral dimensions of the anterior ocular section and of
the size of the implant used.
