OCULUS Easygraph 70620 User manual

Copyright by
G/70620/0906/e
Easygraph 70620
Instruction Manual
Measurement and Evaluation System for Corneal Topography

Page 2
Instruction Manual Easygraph
0 Foreword
Thank you for the confidence which you have placed
in us by buying this OCULUS product. With this unit
you have made your decision for a modern, highly
developed product which has been manufactured
and tested according to the highest standards of
quality. Research and development at OCULUS,
which always aim at serving your best interests, can
lead to changes in the design and scope of standard
equipment. For this reason the illustrations in this
Instruction Manual may differ in some respects from
the unit as delivered.
Our company can look back on a history that
stretches more than 100 years into the past.
OCULUS today is a middle-sized company whose
only focus is to support physicians and optometrists
in their demanding work with a line of top-quality
products for ocular examinations and operations.
The Easygraph before you belongs to the latest
generation of topographic measuring instruments. It
combines keratometric measurement with the
measurement of corneal topography. The unit's
extreme accuracy of measurement and simplicity in
use are the result of our careful development.
Proper use is indispensable for safety in working with
the unit. Therefore, please familiarize yourself
thoroughly with the contents of this Instruction
Manual before using the unit for the first time.
Should you have questions or need further
information on your unit, please contact us by
telephone or send us a fax message. Our service
team will be happy to help you.
OCULUS Optikgeräte GmbH -
The Management and Staff

Instruction Manual Easygraph Page 3
1 Table of Contents
0Foreword...........................................................................................................................................2
1Table of Contents.............................................................................................................................3
2Scope of Supplies and Optional Accessories...................................................................................5
3Safety Precautions ...........................................................................................................................6
4Description of the Unit and its Functions..........................................................................................7
5Appropriate Use / Intended Application............................................................................................7
6Start-up.............................................................................................................................................7
6.1 Directions for Transport and Storage........................................................................................ 7
6.2 Before First Use ........................................................................................................................8
6.3 Components of the Device........................................................................................................8
6.4 Installation.................................................................................................................................9
6.5 Electrical Connection.................................................................................................................9
6.6 Installation of Software............................................................................................................10
6.6.1 General ............................................................................................................................10
6.6.2 Installation of the USB driver ...........................................................................................10
6.6.3 OCULUS – Bootloader.....................................................................................................11
6.6.4 OCULUS – Easygraph.....................................................................................................12
6.6.5 Switch off the USB-Powersaving.....................................................................................13
7Operation........................................................................................................................................14
7.1 Before the Examination.........................................................................................................144
7.2 After every Examination..........................................................................................................15
7.3 Starting Patient Data Management.........................................................................................15
7.4 Patient Data Management ......................................................................................................15
7.4.1 Selection of a Patient.......................................................................................................15
7.4.2 Entering a New Patient ....................................................................................................16
7.4.3 To Start the Examination Program................................................................................... 16
7.4.4 Deleting / Moving Examination Data................................................................................16
7.4.5 Patient Data .....................................................................................................................17
7.4.5.1 Rename Patient........................................................................................................17
7.4.5.2 Deleting Patient Data................................................................................................17
7.4.5.3 Exporting Patient Data..............................................................................................17
7.4.5.4 Importing Patient Data.............................................................................................. 18
7.4.6 Backup Copies of Data .................................................................................................... 19
7.4.6.1 Backing Up Data.......................................................................................................19
7.4.6.2 Data Restoration.......................................................................................................19
7.4.6.3 Auto-Backup .............................................................................................................19
7.4.7 Changing Settings............................................................................................................ 20
7.5 The Examination Program.......................................................................................................21
7.5.1 How to Carry Out a Measurement...................................................................................21
7.5.2 Using Different Types of Display to Evaluate Examination.............................................. 23
7.5.2.1 Overview Display......................................................................................................23
7.5.2.2 Color Map large ........................................................................................................25
7.5.2.3 3D Cornea.................................................................................................................25
7.5.2.4 Fourier Analysis........................................................................................................27
7.5.2.4.1 Applications of the Fourier Display Mode in Keratokonus....................................29
7.5.2.5 Zernike Analysis (optional) .......................................................................................31
7.5.2.5.1 General.................................................................................................................31
7.5.2.5.2 Zernike Analysis Using the Easygraph.................................................................33
7.5.2.5.3 Zernike Fit Parameters ......................................................................................... 34
7.5.2.5.4 Zernike: Normal Values and Aberration Coefficient .............................................34
7.5.2.5.5 Zernike 2D Display Mode .....................................................................................35
7.5.2.6 Indices (optional).......................................................................................................36
7.5.2.6.1 Vertical Decentration.............................................................................................39
7.5.2.7 Refractive Display Mode...........................................................................................40
7.5.2.8 Height Data...............................................................................................................42
7.5.2.9 Camera Image..........................................................................................................45
7.5.2.10 Refractive Compare.................................................................................................. 45
7.5.2.11 Comparing Examinations..........................................................................................47
7.5.3 Contact Lens Fitting (optional).........................................................................................48

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Instruction Manual Easygraph
7.5.3.1 Selecting a Contact Lens..........................................................................................49
7.5.3.2 Fluo Image Simulation / [Calc. fluo.]......................................................................... 50
7.5.3.2.1 Fluo Icon Selection Switches................................................................................51
7.5.3.2.2 Shifting and Rotating the Contact Lens................................................................51
7.5.3.2.3 Setting Contact Lens Parameters / [Details].........................................................52
7.5.3.2.4 Changing the Scale of the Fluo Image .................................................................53
7.5.3.2.5 Top Test................................................................................................................53
7.5.3.2.6 Using Hecht Fitting Software / [Hecht CL]............................................................54
7.5.3.3 Refraction Module / [Refraction]...............................................................................55
7.5.3.3.1 Power Calculation for Toric Lenses......................................................................56
7.5.3.3.2 Power Calculation for Soft Lenses........................................................................58
7.5.3.4 Storing and Loading the Fitted Contact Lens...........................................................58
7.5.4 Changing Settings............................................................................................................ 60
7.5.4.1 “Change System Settings” Button [System->]..........................................................63
7.5.4.2 Contact Lens Database............................................................................................54
7.5.4.3 Input New Contact Lens Types / [Lens geometry ->]...............................................65
7.5.4.3.1 Creating Contact Lens Geometries (Rigid)........................................................... 66
7.5.4.3.2 Creating Soft Lens Geometries ............................................................................68
7.5.4.3.3 Import and Export of Contact Lens Data ..............................................................69
7.5.5 Other Functions of the Examination Program..................................................................70
7.5.5.1 Loading old Examinations.........................................................................................70
7.5.5.2 Printout......................................................................................................................71
7.6 The Easygraph Measurement System....................................................................................71
7.6.1 Reference Measurement .................................................................................................71
7.6.2 Other Functions................................................................................................................71
8Maintenance...................................................................................................................................72
8.1 Care and Cleaning ..................................................................................................................72
8.2 Eliminating Errors or Malfunction............................................................................................72
8.2.1 Troubleshooting ...............................................................................................................72
9Terms of Warranty and Service......................................................................................................73
9.1 Terms of Warranty...................................................................................................................73
9.1.1 Liability for Malfunction or Damage..................................................................................73
9.1.2 Manufacturer’s and Service Address...............................................................................73
10 Disposal ......................................................................................................................................74
11 Appendix.....................................................................................................................................74
11.1.1 Technical Data.................................................................................................................74
11.1.2 Minimum PC requirements ..............................................................................................74
12 Literature.....................................................................................................................................75
13 Index ...........................................................................................................................................76

Instruction Manual Easygraph Page 5
2 Scope of Supplies and Optional Accessories
Easygraph Type 70620 70620 01 000
Y-Cable USB 70620 00 001
Plug-in
power supply unit 5V,1A 05150070
Adapter for
power supply Euro 05150071
Adapter for
power supply USA/Japan 05150072
Dust cover 70620 00 004
Reference globe 70500 05 000
Holder (for slitlamp) 70620 00 010
CD with Easygraph Software 70620 00 005
User manual G/70620/..../ed
Easygraph parking unit 70620 00 006
(for table top mounting)
Optional:
Adapter for
power supply UK 05170073
Sliding holder (enables using
of the slitlamp while the Easy-
graph remains on the holder) 70585
Software module
Keratoconus Screening
and Zernike Analysis 70624
Software module
Contact Lens Fitting 70626

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Instruction Manual Easygraph
3 Safety Precautions
The manufacturer is required by law to inform the
user explicitly on the safety aspects of dealing with
this unit. This chapter contains a summary of the
most important points to be noted regarding
technical safety.
Other safety precautions are contained in the text of
this Instruction Manual and are designated with the
following symbol:
Please pay special attention to these directions.
Keep this Instruction Manual carefully in a place
where it is accessible at all times for those using the
unit. The unit may only be used for its intended
purpose as described in this Instruction Manual in
Point Appropriate Use / Intended Application and
only by persons whose training and practical
experience ensure that they will use the unit
properly.
Before the unit is operated for the first time, an
introductory training in its use must be carried out by
us or an authorized dealer.
Please operate the unit only with original parts and
accessories delivered by us and in a technically
flawless condition. Do not attempt to use it if it is
damaged, but rather contact your supplier.
Please abide by accident prevention laws where
applicable.
The unit may be used in medical areas only if they
are equipped according to VDE 0107 norms or the
equivalent (Association of German Electrotechnical
Engineers).
Always disconnect the electric plugs of the
Easygraph and all units connected to it, e.g., the PC
and the printer, from their power sources before
carrying out maintenance or cleaning work.
Do not exert main force to connect electrical plugs
and sockets. If it is not possible to connect them,
check whether the plug is correct for the socket. If
you find damage in either a plug or a socket, have
them repaired by our service personnel.
To disconnect electric plugs from their sockets, do
not pull on the cable, but rather on the plug itself.
Any auxiliary equipment connected to the analog or
digital interfaces of this unit must be certified as
meeting applicable EN and/or IEC-specifications. In
addition, all configurations must fulfill IEC-Norm No.
601-1 for systems.
Do not connect the Easygraph with non-medical
electrical equipment (e.g. data processing devices)
for purposes of creating an electromedical system if
this will result in a safety level for the patient which is
below that specified by IEC-Norm No. 601-1. If
permissible levels for leakage currents are exceeded
due to such connections, appropriate safety
measures, including a disconnecting device, must be
present.
Do not use the units contained in the Standard
Equipment List
•in places where there is danger of explosion,
•in the presence of combustible anesthetics or
volatile solvents such as alcohol, benzine or the
like.
Do not store or use the unit in damp rooms. Avoid
placing the unit near dripping, or splashing water,
and make certain that no liquids can enter the unit.
For this reason, please do not place any containers
of liquid on top of the unit, and also take care when
cleaning the unit with a damp cloth that no liquid gets
into the unit.
Do not cover the air vents.
Note: This unit is a high-quality technical product. To
ensure that it performs flawlessly and safely, we
recommend having the unit inspected by our service
personnel every two years. Should any problem
arise which you cannot solve with the enclosed
"Troubleshooting" list (Section 8.2.1), please label
the unit "Out of Order" and contact our service
department.

Instruction Manual Easygraph Page 7
4 Description of the Unit and its Functions
The OCULUS Easygraph belongs to the most
modern generation of precision topographic
measuring instruments. It combines keratometric and
topographic measuring methods in a single unit.
Measurement of the corneal surface is carried out
through a system of rings which are reflected at the
cornea. The resulting data are evaluated by the
computer.
Technical Principle:
A illumination system with a special reflector
illuminates a transparent calotte or "skullcap" with
concentric circles from behind.
The image of this "cap" is reflected from the
examinee's eye, which is opposite to it.
This virtual image is captured by a precision lens and
a tandem-arranged CCD camera.
All distortions found in the radii of curvature of the
examinee's eye thus become available for use by the
measuring process.
The image is then processed by the measuring unit
for evaluation, i.e. it is made available to the PC in
digitized and compressed form for further
processing.
After receiving appropriate data from a screen
diagram, the PC uses this information to develop a
topographic image of the cornea.
It then shows the measurement results on the screen
not only in color but also in the form of a diagram
and a 3-dimensional image.
5 Appropriate Use / Intended Application
The OCULUS Easygraph is a measuring instrument
which is intended for eye examinations and only for
the uses described in this Instruction Manual.
The unit is used for measuring corneal topography
and has been designed for use in fitting contact
lenses.
It may therefore be used only by persons who have
been instructed in its use and whose professional
training, knowledge, and practical experience ensure
that they will work with the unit appropriately.
The OCULUS Easygraph has been designed for use
in the examination rooms of practicing
ophthalmologists, for hospital departments, opticians
and optometrists. It may be used only at locations
specifically designated for it or when attached to an
examination unit.
The OCULUS Easygraph may be used only with
original parts and accessories delivered by us and in
a technically flawless condition.
Electric power must be supplied by the special power
pack (cf. the electrical equipment specifications).
Other types of connection are not permissible.
Please also observe the safety precautions described
above!
6 Start-up
6.1 Directions for Transport and Storage
Should you transport the unit to another location,
please do so very carefully.
Avoid the vicinity of heating units and humidity both
during use of the instrument and when it is stored.
Check the unit for damage after each relocation.
Under no circumstances should you put a damaged
unit into operation; rather, please get in contact with
our service department.
The optic components in the unit may become
covered by condensation if you store the unit in a
cold room or in a vehicle during the cold part of the
year or if there are wide changes from cold to warm
in the ambient temperature.
Please give the unit time to acclimatize to its new
surroundings before using it for the first time.
The conditions set by IEC-Norm No. 601-1 for
transport and storage are:
Ambient temperature: -40°C to +70°C
Relative Humidity: 10 % to 100%
including condensation
Air pressure: 500 hPa...1060hPa
(7.3 psi...15.3 psi)
These levels apply for a period of 15 weeks at most
if the unit is kept in an appropriate case.

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Instruction Manual Easygraph
6.2 Before First Use
Please remove the device as well as the accessories
from the packaging and keep this. You can use it for
correctly sending or transporting the device in the
case of service or repair. In this way you avoid
unnecessary damage and costs.
Read these operating instructions carefully.
Being an optical device this unit must be handled
with care. Do not expose it to any vibration, impacts,
contamination and high temperatures.
6.3 Components of the Device
1 Rotatable reflector
2 Gripping surfaces for better grip
3 Targets
4 Recess for the nose
5 Turning range for setting
the right/left eye
6 Camera opening and fixing mark
7 Rotatable part of the calotte
8 Fixed part of the calotte
9 Mounting thread
10 Connection socket
11 Name plate

Instruction Manual Easygraph Page 9
6.4 Installation
For operation the Easygraph must be fastened with
the enclosed holder on a slitlamp.
This holder is designed for slitlamps with a drilling of
8mm diameter. It is possible to get other holders on
request.
For this purpose first screw the enclosed holder with
the knurled screw on the mounting thread (Item 9) of
the Easygraph.
Remove a cover of the support possibly present on
the slitlamp. Then set the shaft of the Easygraph
holder in the receptacle of the slitlamp.
As an alternative the Easygraph can also be mounted
on an optionally available guide rail.
The Easygraph can be pushed with this into a rest
position, so that examinations can then be made with
the slitlamp. However, note that the guide rail can
also move when moving the slitlamp and the
microscope attachment. Hold the guide rail or the
Easygraph firmly if necessary so that they do not
collide with the head support.
6.5 Electrical Connection
The Easygraph may be operated only with the
supplied plug-in power supply unit.
To adapt to different countries the plug-in power
supply unit has replaceable plug adapters for
connection to the mains and a wide range input.
Select the adapter corresponding to your country
and push it into the plug-in power supply unit until it
snaps into place.

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Instruction Manual Easygraph
Connect the supplied Y-cable with the Easygraph,
USB interface of the PC and low-voltage socket of
the plug-in power supply unit.
The coupling of the Y-cable for the Easygraph has a
bayonet lock. Observe, when put in the plug that the
groove of the coupling and lug in the plug of the
Easygraph agree. For your assistance, there are two
red dots on coupling, as well as a third red dot on the
Easygraph housing. When connecting, all the dots
should be in arow.
Secure the plug connection by turning the knurled
sleeve of the coupling by approx. 1/8 turn.
If the coupling cannot be inserted without exerting
force, the knurled sleeve of the coupling may be in
the locking position. Then turn the knurled sleeve
back first of all.
Plug the plug-in power supply unit into the wall outlet
only on conclusion.
When separating the plug connections first separate
the power supply from the Easygraph (at the wall
outlet or at the low-voltage socket).
6.6 Installation of Software
6.6.1 General
The OCULUS Easygraph Software needs the
operation system Windows™ with the support of the
USB interface. At the time of printing this manual
these are: Windows 98SE, Windows ME, Windows
2000 and Windows XP. Of course there must a free
USB interface be available in the used PC.
6.6.2 Installation of the USB driver
When you use the Easygraph for the first time, two
drivers have to be installed. Initially the Easygraph is
registered in the system by „OCULUS – Bootloader“.
The actual firmware is copied into the Easygraph
only during using the PC software. This makes future
firmware-updates more easy, without the necessity
of the user’s interference.