lenstar LS 900 User manual

1
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© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
INSTRUCTIONS FOR USE
Biometer
Lenstar LS 900®
10. Edition / 2015 – 06
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DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS PORTUGUÊS SVENSKA
© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
INSTRUCTIONS FOR USE
Biometer
Lenstar LS 900®
10. Edition / 2015 – 06
Introduction
Thank you for choosing a HAAG‑STREIT device. Provided you comply careful‑
ly with the regulations in these instructions for use, we can guarantee reliable and
trouble‑free use of our product.
WARNING!
Read the instruction manual carefully before commissioning this pro-
duct. It contains important information regarding the safety of the user
and patient.
NOTE!
Federal law restricts this device to sale by or on the order of a physician
or licensed practitioner.
Intended use
The LS 900 is a non-invasive, non-contact OLCR (optical low-coherence reectom‑
etry) biometer used for obtaining ocular measurements and performing calculations
to assist in the determination of the appropriate power and type of IOL (intraocular
lens) for implantation after removal of the natural crystalline lens. The LS 900 mea‑
sures:
• Axial eye length
• Corneal thickness
• Anterior chamber depth
• Aqueous depth
• Lens thickness
• Corneal curvature
• Radii for at and steep meridian
• Axis of the at meridian
• White‑to‑white distance
• Pupil diameter
Contents
1. Safety ..................................................................................... 4
1.1 Areas of application of the device.............................................................................4
1.2 Patient population.....................................................................................................4
1.3 Ambient conditions....................................................................................................4
1.4 Shipment and unpacking...........................................................................................4
1.5 Installation warnings..................................................................................................4
1.6 Operation, environment.............................................................................................4
1.6.1 Plausibility of the measurements..............................................................................5
1.6.2 IOLcalculation ..........................................................................................................6
1.6.3 References................................................................................................................6
1.6.4 IOLconstants............................................................................................................6
1.6.5 IOL constants derived using data from an immersion ultrasound biometer..............7
1.6.6 IOL constants derived from data from a contact ultrasound biometer.......................7
1.7 Optical radiation........................................................................................................7
1.8 Disinfection................................................................................................................7
1.9 Warranty and product liability....................................................................................7
1.10 Symbols....................................................................................................................7
2. Introduction........................................................................... 8
2.1 Basic construction.....................................................................................................8
2.2 Examination components (LS 900)...........................................................................8
2.3 Control component (PC)...........................................................................................9
2.4 Instrument table (option)...........................................................................................9
3. Appliance assembly / installation........................................ 9
3.1 Computer connection................................................................................................9
3.2 Installing a short forehead band when using the
optional T‑Cone.........................................................................................................9
4. Operation............................................................................. 10
4.1 Position of patient during measurement..................................................................10
4.2 Measuring with LENSTARAPS (optional)...............................................................10
4.3 Optional T‑Cone......................................................................................................10
4.3.1 Fitting the optional T‑Cone......................................................................................10
4.3.2 Measuring with the optional T‑Cone........................................................................11
4.3.3 Removing the optional T‑Cone................................................................................11
4.4 Fixation....................................................................................................................11
4.5 Measured variables.................................................................................................11
4.5.1 A‑Scan....................................................................................................................11
4.5.2 Keratometry.............................................................................................................12
4.5.3 White‑to‑white distance...........................................................................................12
4.5.4 Pupillometry & visual axis.......................................................................................12
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DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS PORTUGUÊS SVENSKA
© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
5. Commissioning................................................................... 12
5.1 Switching on the device..........................................................................................12
5.2 Switching off the device..........................................................................................12
6. Technical data......................................................................12
6.1 Weight.....................................................................................................................12
6.2 Power supply...........................................................................................................12
6.2.1 Primary side............................................................................................................12
6.2.2 Secondary side.......................................................................................................12
6.3 Illumination modalities.............................................................................................13
6.3.1 Eye length measurement (A-Scan) and central xation..........................................13
6.3.2 Keratometry.............................................................................................................13
6.3.3 Illumination..............................................................................................................13
6.3.4 Positioning aid (from serial number 2000)..............................................................13
6.4 Measured variables Lenstar LS 900.......................................................................13
6.4.1 Central corneal thickness (CCT).............................................................................13
6.4.2 Anterior chamber depth (ACD)................................................................................13
6.4.3 Lens thickness (LT).................................................................................................13
6.4.4 Axial length (AL)......................................................................................................13
6.4.5 Keratometry (R).......................................................................................................13
6.4.6 White‑to‑white distance (WTW)..............................................................................13
6.4.7 Pupillometry............................................................................................................13
6.4.8 Study design...........................................................................................................13
6.5 Technical data ofT‑Cone (option)...........................................................................14
6.5.1 Normative considerations........................................................................................14
6.5.2 Measuring accuracy ...............................................................................................14
6.5.3 Reproducibility.........................................................................................................15
7. Software / Help menu / Error messages ...........................15
8. Maintenance ........................................................................ 15
8.1 Function check / zero adjustment...........................................................................15
8.2 Cleaning..................................................................................................................15
8.3 Maintenance of T‑Cone (option)..............................................................................15
A. Appendix..............................................................................16
A.1 Accessories / spare parts........................................................................................16
A1.1 LENSTAR LS 900 ...................................................................................................16
A.1.2 T‑Cone (option).......................................................................................................16
B. Legal regulations ................................................................ 16
C. Classication......................................................................16
C.1 LENSTAR LS 900 biometer ....................................................................................16
C.2 T‑Cone (option).......................................................................................................16
D. Disposal............................................................................... 16
E. Standards............................................................................. 16
F. EMC supplement ................................................................17
F.1 General...................................................................................................................17
F.2 Emitted interference (standard table 1)...................................................................17
F.3 Immunity (standard table 2)....................................................................................18
F.4 Immunity on non‑life support devices (standard table 4) ........................................19
F.4 Safe distances on non‑life support devices (standard table 6) ...............................20
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© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
1. Safety
DANGER!
Failure to comply with these instructions may result in material damage
or pose a danger to patients or users.
WARNING!
These warnings must absolutely be complied with to guarantee
safe operation of the device and to avoid any danger to users and
to patients.
NOTE!
Important information: please read carefully.
1.1 Areas of application of the device
The device is intended for use in doctor’s practices, hospitals, optometrists’and op‑
ticians’premises.
1.2 Patient population
The patient must be capable of sitting up straight and keeping his head still. He
must be physically and mentally able to cooperate well and mentally capable of fol‑
lowing the examination. Patients must be at least 6 years old.
1.3 Ambient conditions
Transport: Temperature
Air pressure
Relative humidity
from
from
from
−40°C
500 hPa
10%
to
to
to
+70°C
1060 hPa
95%
Storage:
Temperature
Air pressure
Relative humidity
from
from
from
−10°C
700 hPa
10%
to
to
to
+55°C
1060 hPa
95%
Use:
Temperature
Air pressure
Relative humidity
from
from
from
+10°C
800 hPa
30%
to
to
to
+35°C
1060 hPa
90%
1.4 Shipment and unpacking
• Before unpacking the device, check whether the packaging shows traces of improper
handling or damage. If this is the case, notify the transport company that delivered the
goods to you.
• Unpack the equipment together with a representative of the transport company. Make a
report of any damaged parts. This report must be signed by you and by the representa‑
tive of the transport company.
• Leave the device in the packaging for a few hours before unpacking it (condensation).
• Check the device for damage after it is unpacked.
• Return defective devices in the appropriate packaging.
• Store packaging material carefully, so that it can be used for possible returns or when
moving.
• Only use the original packaging material for moving the device.
• Check that the contents of the packaging correspond to the contents specied on the
leaet included in the packaging.
1.5 Installation warnings
WARNING!
• Only use a HAAG‑STREITapproved external medical power supply (EN
60601‑1).
• The plug, cable and socket must function perfectly.
• Before carrying out maintenance or cleaning work, the device must al‑
ways be disconnected from the mains by unplugging the power supply
or plug.
• Computers and further ancillary devices (printers, etc.) must comply with
the EN 60601‑1 standard, or be connected with galvanic isolation to ex‑
ternal networks (isolating transformer, galvanic Ethernet isolator, etc.).
• For connection to PC, use only the supplied USB cable (2 m).
• The power supply must be positioned in such a way that proper heat dis‑
persion is guaranteed.
• The device should be set up in such a way that the plug is always eas‑
ily accessible and the device can easily be disconnected from the pow‑
er supply.
1.6 Operation, environment
DANGER!
• It is not permitted to make modications to the measuring device.
• It is expressly forbidden to open the device!
• Never use the device in potentially explosive environments where volatile
solvents (alcohol, benzine, etc.) and combustible anaesthetics are in use.
WARNING!
• The doctor or the operator is under an obligation to inform the patient
about safety instructions concerning them and to ensure that these in‑
structions are complied with.
• Only staff trained and experienced in the assessment of measuring data
and calculations and the manual entry, editing and deletion of data may
examine patients, operate the device and interpret results.
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© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
• All users must be appropriately trained and familiarised with the contents
of the instructions for use, especially with regard to the safety instructions
contained therein.
• Measurements can be carried out with dilated or undilated pupils. Dilation
of the pupil only inuences pupillometry.
• We recommend checking the calibration of the optional T-Cone when t‑
ting it and repeating this if necessary (see section "Function check").
NOTE!
• This device may only be used for the purpose described in these instruc‑
tions for use.
• Installation only by trained specialists.
• The PC on which the EyeSuite software is installed may not contain any
other software which could restrict the correct operation of EyeSuite.
• Please switch the computer off if it is not to be used for a long time.
• The device may not be transported, stored or operated outside the speci‑
ed ambient conditions (see section "Ambient conditions").
• The device is to be used in a room in the medical area with attenuated
light.
• If the device or accessories to it are exposed to the effects of an exter‑
nal force (e.g., by being accidentally knocked or dropped), this sensitive
measuring device must be promptly checked according to section “Func‑
tion check” and, if necessary, returned to the factory for repair.
• If the device is moved/transported, a functional check must be performed
in accordance with section "Function check".
• Perform a zero adjustment and function check when prompted by the
software.
• The selected measuring mode must be checked before every measure‑
ment.
• Keep these instructions for use in a place where they are accessible at all
times to those working with the device.
• Warranty claims can only be made if the instructions for use have been
complied with.
• The manufacturer of the device is not liable for loss or damage due to un‑
authorised handling of the same.All warranty claims arising in this case
are null and void.
• Always remove the dust cover before switching the device on.The light
sources can be destroyed by overheating. Likewise, make sure that the
device is switched off before attaching the dust cover.
• Repairs may only be conducted by suitably trained and authorised spe‑
cialist personnel. Incorrect repairs can pose considerable risks for operat‑
ing 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.
1.6.1 Plausibility of the measurements
WARNING!
• Users must check measurement readings for plausibility. This includes
the checking of theA‑scan and the cursors, which automatically adjust
to the signal, the keratometry values, the white‑to‑white distance and the
pupillometry, whenever one of the measurements displays an unusual‑
ly 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 erroneous
measuring results.
• It may not be possible, under certain circumstances, to carry out mea‑
surements on persons with xation problems.
• In cases of thick cataracts and uncertain measurement of the axial
length, ultrasound biometry should be performed as a control examina‑
tion.
• 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 impossi‑
ble 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 keratore‑
fractive surgery because such eyes may signicantly deviate from spher‑
ical surfaces.
• The user should make a visual check when carrying out the measure‑
ment procedure, to ensure that all light spots are present.
• If the device repeatedly generates error messages, stop using it and con‑
tact the customer service.
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© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
• You are recommended always to examine both of the patient’s eyes ve
times. The user should subject the measurement readings to extra scru‑
tiny if there is a notable difference between the right and left eye. The fol‑
lowing 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 theA‑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. Uncer‑
tainty 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 correc‑
tion of intraocular pressure readings for diagnosing glaucoma.
• An excessively tilted or decentered IOLmay make it impossible to mea‑
sure the anterior chamber depth, lens thickness and aqueous depth.
• 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 particu‑
lar), and the user should check the data for plausibility.
• Ambient light has a bearing on pupil‑diameter measurement readings.
The user is responsible for ensuring the correct level of ambient light
when carrying out pupillometry. The LS 900 cannot monitor ambient light,
so do not use pupillometry as the decisive factor when considering kera‑
torefractive 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 dimen‑
sions of the anterior ocular section and of the size of the implant used.
• The measured results of patients with asteroid hyalosis may not be accu‑
rate (in particular the axial length measurement) and must therefore be
veried by the user in terms of their plausibility.
• If the optionalT‑Cone is used, the user should verify the even illumina‑
tion of the cone.
1.6.2 IOL calculation
The measurements taken with the LS 900 are a central element of every IOL cal‑
culation.Afurther important parameter in calculating the lens to be implanted is the
IOL constant. When using the Lenstar LS 900, only IOLconstants optimised for
optical biometers should be used. Please contact your IOL manufacturer for infor‑
mation on optimised IOL constants for optical biometry. An alternative source of
information for IOL constants optimised for optical biometry is the website of the
“User Group for Laser Interference Biometry” (ULIB) at the University of Wuerz‑
burg, Germany. Even though the constants published there have been optimised
for a different optical biometer, published data [1, 2, 3] indicate that these IOL con‑
stants can also be used for calculating IOL power with the Lenstar. Downloadable
IOL Constants les for the Lenstar, featuring the ULIB IOL-Constants for the Haigis,
Hoffer Q, Halladay I, SRK/T and SRK II ‑ Formulae as well as IOLConstants for the
use with the Olsen Formula are available in the Key‑User section of the Haag‑Stre‑
it homepage.
To further improve the clinical result, HAAG‑STREIT recommends that every sur‑
geon creates personally optimised IOL constants based on pre‑operative mea‑
surement data generated with the Lenstar and reliable postoperative data (e.g., 3
months after the operation).
1.6.3 References
[1] Buckhurst P J, Wolffsohn J S, Shah S, Naroo SA, Davies L N, Berrow E J, “A
new optical low coherence reectometry device for ocular biometry in cataract pa‑
tients”, British Journal of Ophthalmology 2009;93:949‑953 [2] Holzer M P, Mamusa
M,Auffarth G U, “Accuracy of a new partial coherence interferometry analyser for
biometric measurements”, British Journal of Ophthalmology 2009;93: 807‑810
[3] Rohrer K, Frueh B E, Wälti R, Clemetson IA, Tappeiner C, Goldblum D, “Com‑
parison and Evaluation of Ocular Biometry Using a New Noncontact Optical
Low-Coherence Reectometer”, Ophthalmology 2009, 116:2087-2092
1.6.4 IOL constants
HAAG‑STREIT recommends using personalised IOLconstants to achieve maximum
prediction accuracy of the IOL calculation. Using personalised IOLconstants minimis‑
es the effects of individual surgical techniques, individual measurement and surgical
equipment and individual physiological differences in the patient cohort under treat‑
ment on the IOLcalculation.
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1.6.5 IOL constants derived using data from an immersion
ultrasound biometer
If there are optimised IOL constants available from an immersion ultrasound biome‑
ter, they may be used as a starting point for further optimisation of IOLcalculation with
the Lenstar. Differences in IOLcalculation may still occur, as the keratometry data are
collected in different ways. The “User Group for Laser Interference Biometry” (ULIB) at
the University of Würzburg, Germany has published on its website a manual explain‑
ing how to correct the effect of keratometry on the IOLconstants. Still, the IOL con‑
stants acquired in this way should only be used as a starting point for further optimisa‑
tion/personalisation.
1.6.6 IOL constants derived from data from a contact
ultrasound biometer
If there are optimised IOL constants available based on data from a contact ultra‑
sound biometer, they must be stringently recalculated for use with the Lenstar. The
“User Group for Laser Interference Biometry” (ULIB) at the University of Würzburg,
Germany has published on its website a manual explaining how to correct the effect
of ultrasound biometry and keratometry on the IOL constants. Constants acquired
in such a way should only be used as a starting point for further optimisation/per‑
sonalisation.
1.7 Optical radiation
WARNING!
The light from this device may be dangerous. The risk of eye damage
increases with the irradiation period.An exposure time with this device
at maximum intensity of over 100 individual measurements per patient
eye with dilated pupil per day exceeds the risk guideline value.
NOTE!
In accordance with EN 60825‑1, the limiting values for class 1 lasers
are respected when the device is used in the dened manner.
NOTE!
The device complies with the limit values for risk group 1 in accordance
with EN 62471 insofar as no more than 100 individual measurements
are performed per day and per patient’s eye with dilated pupil. If this lim‑
it value of 100 individual measurements is exceeded, the patient’s eye
may be damaged by the white illumination. (Radiance 1800 Wm‑2 sr‑1)
1.8 Disinfection
NOTE!
• The device does not need to be disinfected.
• If the optionalT‑Cone is used, its tip must be cleaned with max. 70% al‑
cohol after each patient.
For more information on cleaning, please refer to the ‘Maintenance’ section.
1.9 Warranty and product liability
Haag-Streit products must be used only for the purposes and in the manner des-
cribed in the documents distributed with the product.
The product must be treated as described in the ‘Safety’ chapter. Improper han-
dling can damage the product. This would void all guarantee claims.
Continued use of a product damaged by incorrect handling may lead to personal
injury. In such a case, the manufacturer will not accept any liability.
Haag-Streit does not grant any warranties, either expressed or implied, including
implied warranties of merchantability or fitness for a particular use.
Haag-Streit expressly disclaims liability for incidental or consequential damage
resulting from the use of the product.
This product is covered by a limited warranty granted by your seller.
The optional T-Cone must be stored in its original dust cover and protected from
direct sunlight.
This product is covered by a limited warranty, which may be reviewed at
www.haag-streit-usa.com.
For US
A only:
1.10 Symbols
Read the instructions for use
attentively
General warning: Read the ac-
companying documentation
Test symbol of CSA with ap-
proval for USA
Notes on disposal, see the
'Disposal' chapter
European certificate of
conformity Manufacturer
Year of production Direct current
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Alternating currentHS reference number
Serial number Housing protection
Trademark of the manufacturer
HAAG-STREIT AG
2. Introduction
2.1 Basic construction
The system is divided into two parts: one concerned with examination (LS 900) and
the other with control (Notebook, PC). The examination part communicates via a
USB connection with the external PC. The LS 900 is operated using the "EyeSuite"
software installed on the PC. Integral, automatic error recognition for measurements
guarantees reliable examination results.
2.2 Examination components (LS 900)
Overview 81
2
3
4
5
7
9
10
11
12
13 6
1. Front ring
2. Housing
3. Service cover
4. Cable cover
5. Control lever
6. Type plate
7. Side identication sticker
Head rest (option)
8. Head rest
9. Headband
10. Mark for optimum eye
height
11. Chin rest
12. Chin rest height adjust‑
ment
13. Hand grips for patient
T-Cone (option)
14. Dust cover for storage packaging
15. T‑Cone topography add‑on
16. “Top” – shows which side of the T‑Cone is up.
17. Locking/release clip
18. Type plate
19. Base plate for storage packaging
20. Short forehead band with four Phillips screws
14
15
16
17
18
19
20
Device state
The device state indicator allows device monitoring without PC software:
21. State indicator Dark Off
21
Orange Standby
Green On
Blue Light source on
RED ERROR
Control lever
The joystick is used to position the device in
relation to the patient’s eye.
22. Trigger
22
Connections
23. USB‑device connection
24. DC‑device connection
25. USB 2.0 cable
26. DC cable
27. Cable tension compensator
23
24
25
26
27
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2.3 Control component (PC)
Acommercial PC is used as the control component for the biometer.
WARNING!
The software must be installed by trained personnel in accordance with
the separate installation instructions. For further information, please
contact your HAAG‑STREIT representative.
2.4 Instrument table (option)
An adjustable instrument table (option) allows the height of the device to be set at a
comfortable height for the individual patient.
28. Table top
29. Left‑hand drawer (for external medical power supply) / Switch box SB01
30. Right‑hand drawer (empty)
31. Elevator column (mechanical with spring)
32. Stand base with castors
28
29
30
31
32
3. Appliance assembly / installation
WARNING!
The device must be installed by trained personnel in accordance with
the installation instructions provided in the separate service manual.
3.1 Computer connection
WARNING!
For connection to PC, only use the supplied USB cable (2 m)
• Connect the electric power supply cable. Integral mains components work with the
voltages specied under section A.1.1 "Electrical data". It is not necessary to select
the voltage on the device.
• If an instrument table HSM 901 (option) has been supplied, the power supply of the
LS 900 can be connected to the Switchbox SB01 (left drawer). Use the instructions for
use enclosed with the switchbox and the instrument table.
3.2 Installing a short forehead band when using the
optional T-Cone
NOTE!
If the Lenstar LS 900 biometer with the optional T‑Cone topography
add‑on is used on an instrument table with a HAAG‑STREIT head rest
(HS art. no. 7200123), the short forehead band delivered with the op‑
tional T‑Cone must be used on the head rest for better measurability. If
the Lenstar is operated without the optional T‑Cone, the short forehead
band does not need to be replaced with the long one.
33. Phillips screws
34. Forehead band
• Detach the forehead band by removing the four Phil‑
lips screws (34) using a size 1 Phillips screwdriver.
• Remove the forehead band (33).
• Insert the short forehead band ( HS art. no.
1021653 )into the head rest and align the holes with
the holes in the head rest.
• Attach the short forehead band using the four Phil‑
lips screws supplied.
33
34
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10
DEUTSCHENGLISH FRANÇAIS ITALIANO ESPAÑOL NEDERLANDS
PORTUGUÊS SVENSKA
DEUTSCHENGLISHFRANÇAISITALIANOESPAÑOLNEDERLANDS PORTUGUÊS SVENSKA
© HAAG-STREIT AG, 3098 Koeniz, Switzerland – HS-Doc. no. 1500.7220055.04100 – 10. Edition / 2015 – 06
4.3 Optional T-Cone
4.3.1 Fitting the optional T-Cone
• Remove the dust cover from the storage packaging.
• Hold the T‑Cone with the locking clip (17) pressed down
next to the metal ring and  t it on the front ring of the Len-
star as shown on the illustration.
• Keep the locking clip depressed so that the T‑Cone lies
 ush with the front ring. Make sure that "TOP" on the metal
ring of the T‑Cone is at the top. The T‑Cone is held in place
on the front ring of the Lenstar LS 900 biometer by strong
magnets.
TOP
17
• Ensure that the red safety mark is no longer visible on the locking clip. If the red safety
mark is still visible, remove the T-Cone and  t it again.
The T-Cone is  tted correctly. The red
safety mark is not visible. The T-Cone is not  tted correctly. The red safety mark is visible. Please remove the
T-Cone and  t it again.
WARNING!
• TheT‑Cone can only be used with the Lenstar with which it was calibrat‑
ed. To use the T‑Cone on another Lenstar or to use another T‑Cone on a
Lenstar with an already saved T‑Cone calibration, the calibration must be
performed again.
• The measuring distance from theT‑Cone to the eye (apex) is approx. 6
mm. Depending on the anatomy of the patient, the tip of the T‑Cone may
touch the eyelid or bridge of the nose. To avoid injuries, care must always
be taken when moving the Lenstar with  tted T-Cone towards the patient.
4. Operation
4.1 Position of patient during measurement
Positioning of the device is done manually by the user. The patient must be posi‑
tioned in such a way that the distance from the measuring head to the eye is ap‑
prox. 68 mm.Asteady head position is promoted by resting the patient’s head in
good contact with the chin rest and forehead band, and by the patient holding on to
the handles supplied. This can positively in uence adjustment time and measuring
accuracy. The patient should sit up as straight as possible.
68 m m
NOTE!
In order to get the best possible results, the patient should be request‑
ed to keep the eye as wide open as possible during the measurement
and to focus on the measuring beam. Blinking is permitted, but should
be kept to a minimum.
4.2 Measuring with LENSTARAPS (optional)
WARNING!
The LENSTARAPS (Automated Positioning System) device moves
autonomously during the automated measurement process. To avoid
trapping  ngers, do not touch any moving parts during the measure-
ment.
NOTE!
• Make sure that the LENSTAR APS is free to move in any direction for op‑
timum performance of the automated measurement process.
• Before using the LENSTAR APS, ensure that the cross slide  xation
screw is unlocked.
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