Nidek Medical ARK-530 User manual

AUTO REF/KERATOMETER
AUTO REF/KERATOMETER
ARK-530A/ARK-510A
ARK-530A/ARK-510A
OPERATOR’S MANUAL
OPERATOR’S MANUAL

NIDEK CO., LTD. : 34-14, Maehama, Hiroishi-cho, Gamagori, Aichi 443-0038, Japan
(Manufacturer) Telephone: [phone]
Facsimile: [phone]
NIDEK CO., LTD. : 3F Sumitomo Fudosan Hongo Bldg., 3-22-5, Hongo,
(Tokyo Office) Bunkyo-Ku, Tokyo 113-0033, Japan
Telephone: [phone]
Facsimile: [phone]
NIDEK INCORPORATED : 47651 Westinghouse Drive, Fremont, California 94539, U. S. A.
(United States Agent) Telephone: [phone]
Facsimile: [phone]
NIDEK S.A. : Europarc 13, rue Auguste Perret, 94042 Créteil, France
(EU Authorized Representative) Telephone: [phone]
Facsimile: [phone]
April 2012
30702-P902H
Printed in Japan
Original instructions

I

Use this device properly and safely.
Safety precautions
BEFORE USE, READ THIS MANUAL.
This operator’s manual contains information necessary for the operation of the NIDEK
AUTO REF/KERATOMETER Model ARK-530A/ARK-510A. This manual includes the
operating procedures, safety precautions, and specifications.
This manual is necessary for proper use. Especially, the safety precautions and operating
procedures must be thoroughly understood prior to operation of the device.
Keep this manual handy to verify use whenever necessary.
The device complies with ISO 10342 subclause 4: 2010 (Ophthalmic instruments-Eye
Refractometers) and ISO 10343 subclause 4: 2009 (Ophthalmic instruments-
Ophthalmometers). The dioptric powers are indicated with reference wavelength Od =
587.56 nm.
There are no parts within the device that requires servicing by the user other than printer
paper.
This manual is described mainly using the screen samples of the ARK-530A.
If you encounter any problems or have questions about the device, please contact NIDEK
or your authorized distributor.
CAUTION
• United States Federal law restricts this device to sale by or on the order of a properly
licensed practitioner.
In this manual, a signal word is used to designate the degree or level of safety alerting. The defini-
tion is as follows.
WARNING
• Indicates a potentially hazardous situation which, if not avoided, may result in death or
serious injury.
CAUTION
• Indicates a potentially hazardous situation which, if not avoided, may result in minor or
moderate injury or property damage accident.

II
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Usage precautions
Safety of LED
Before use
CAUTION
• The device is a Class 1 LED product in accordance with IEC60825-1: 1993+A1:
1997+A2: 2001 and the LED used for the device is safe in expected use conditions
including situations such as looking into the LED using an optical system. However, it
is recommended to observe the following precautions when using the device:
1) Do not direct LED beams to human eyes when unnecessary.
2) Do not look into the objective lens (aperture) for a long period of time for observation.
3) If the device cannot be used properly or any device problem cannot be solved, imme-
diately stop using the device, then contact NIDEK or your authorized distributor.
WARNING
• Connect the power plug to a ground outlet. Or connect a grounding wire to a ground
terminal.
Electric shock or fire may occur in the event of device malfunction or power leakage.
CAUTION
• Do not use the device for other than the intended purpose.
NIDEK is not responsible for accidents or malfunctions caused by careless use.
• Be sure to read the manual prior to operation of the device to understand the safety
precautions and operating procedures thoroughly.
Using the device for purposes other than specified in this manual may cause unex-
pected malfunctions and/or adverse events.
• Never disassemble nor touch the inside of the device.
This may result in electric shock or malfunction.
• Install the device in an environment that meets the following conditions. The following
conditions must be maintained during use.
Use conditions
Temperature: 10 to 35ºC (50 to 95ºF)
Humidity: 30 to 90% (Non-condensing)
Pressure: 800 to 1060 hPa
A place with low dust
A place not exposed to water
A place with little external light
A level and stable surface free from vibration and shock
If the device is not installed and used under the above conditions, the reliability of mea-
sured results is impaired, and malfunction may result. In addition, there is a possibility of
injury if the device receives shock and falls down.
• Avoid installing the device near sunny window or directly under a light.
Intense light entering the measuring window may interfere with proper measurement.

III
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CAUTION
• Avoid storing the device where it is exposed to rain or water, or poisonous gas or
liquid is present.
Corrosion or malfunction of the device may occur.
• Avoid installing the device where it is exposed to direct air-conditioning flow.
Changes in temperature may result in condensation inside the device or adversely
affect measurements.
• Be sure to use a (HOSPITAL GRADE) wall outlet which meets the power specification
requirements.
If the line voltage is too high or too low, the device may not perform properly. Malfunc-
tion or fire may occur.
• Completely insert the power plug into the outlet as far as the prongs will go.
Fire may occur if the device is used with a loose connection.
• Never use a power strip or extension cable to supply the device with power.
The electrical safety may be lowered.
• Do not use a power cord other than the one provided. Also do not connect the
provided power cord to any other device.
Failure or fire may result.
• Do not place heavy objects on the power cord.
The damaged power cord may cause fire or electric shock.
• Before connecting the cable, turn off the power switch and disconnect the power cord
from the outlet.
Malfunction of the device may result.
• Install the device in area where the outlet that the mains plug is inserted into is easily
accessible during use. In addition, ensure that the power cord can be disconnected
without the use of a tool.
Otherwise, it may interfere with disconnecting of the power from the input power source
in case of abnormality.
• Before carrying the device, put the device into packing mode and lock the main body
to the base with the locking lever.
Accidental movement of the measuring unit during transportation may result in malfunction.
For packing mode setting, see “{Shutoff before transporting the device” (page 35).
• Insert the plug into the connector according to the proper indication and orientation
and do not apply undue force to make the connections.
• Be sure to connect a communication cable, checking the symbols of input (IN: )
and output (OUT: ).
Data transmission may not be performed properly.

IV

CAUTION
• When the device is carried, two persons
should hold it at positions (A) and (B)
(both right and left sides). Avoid lifting
by the forehead rest or main body
instead hold it by the bottom of the
base.
If only one person carries the device,
or areas other than the base are used
for lifting and the device falls, there is a
possibility of injury or malfunction.
• This device has been tested and found to comply with the limits for medical devices
to the IEC 60601-1-2: 2007.
These limits are designed to provide reasonable protection against harmful
interference in a standard medical installation.
This device generates, uses and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful
interference to other devices in the vicinity.
However, there is no guarantee that interference will not occur in a particular
installation.
If this device does cause harmful interference to other devices, which can be
determined by turning the device off and on, the user is encouraged to try to correct
the interference by one or more of the following measures:
- Reorient or relocate the receiving device.
- Increase the separation between the devices.
- Connect the device to an outlet on a circuit different from that to which the other
device(s) are connected.
- Consult the manufacturer or field service technician for help.
• The International Electrotechnical Commission sets the essential requirements for
electrical and electronic equipment that may disturb, or be disturbed by, other
equipment. The device complies with these requirements as shown in the tables in “6
EMC (ELECTROMAGNETIC COMPATIBILITY)” (page 127). Follow the guidance in the
tables for use of the device in an electromagnetic environment.
(A) (B)

V
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During use
CAUTION
• Before use, perform visual and operation checks. If abnormal conditions are
encountered, stop using the device.
If the device is used under abnormal conditions, intended results may not occur. Also
unexpected malfunctions or health hazards may occur due to improper measurement.
• Before and after use of the device, and before treating each patient, clean the patient’s
contact area (chinrest and forehead rest) with clean absorbent cotton or gauze
dampened with rubbing alcohol.
If chinrest paper is used, remove one piece for each patient.
For severe stains, wipe the area not with a dry cloth but with gauze dampened with alcohol.
• Take care not to catch hands or fingers in moving parts (measuring unit, main body,
and chinrest). Pay particular attention to the measuring unit as it moves in each
direction during auto alignment. Be sure to give this caution to patients.
Hands or fingers may be pinched and may result in injury.
• Keep the measuring window free of fingerprints and dust. Also confirm that it is not
dirty before use.
The measurement accuracy may decrease substantially.
• In the event of smoke or strange odors, immediately turn off the device and
disconnect the power plug from the outlet. After you are sure that the smoke has
stopped, then contact NIDEK or your authorized distributor.
Usage of the device under such abnormal conditions may cause fire or electric shock. In
case of fire, use a dry chemical (ABC) extinguisher to extinguish the fire.
• Before measurement, explain the measurement purpose and method sufficiently to
patients.
• Instruct the patient to see the picture of a balloon with their eyes wide open. Start the
measurement after confirming that the instruction is properly followed by the patient.
Be careful not to perform measurement while the device is misaligned to the patient’s
eye.
Proper measurement may not be performed.
• After measurement, instruct the patient not to hold the chinrest when the patient is
released from the device.
The device may topple over resulting in injury.
• Immediately replace the power cord if the internal wires are exposed, the device turns
on or off when the power cord is moved, or the cord and/or plug are too hot to be held
with hands.
This may result in electric shock or fire.
In the event of malfunction, disconnect the power cord from the wall outlet. Never touch
the inside of the device and contact NIDEK or your authorized distributor.
• Never press on the LCD with a hard object such as a ball-point pen. Keep magnetic
objects away from the LCD.
The device may be damaged.

VI
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CAUTION
• Do not operate the LCD with wet hands.
Water seeping into the device may result in failure of the device.
• There may be a few dead or constantly-lit pixels in your LCD. This does not represent
failure of the LCD; This is due to the structure of the LCD.
• If the device is connected to a PC that does not comply with IEC60601-1 (except one
that uses an AC adapter that meets the Class II requirements of IEC60950-1), supply
power to the device and PC through isolation transformers.
Contact NIDEK or your authorized distributor for installing isolation transformers.
• When connecting to peripheral equipment such as a PC with LAN port via a
medical facility network, insert or connect an isolation transformer between the
medical electrical equipment and network devices (HUB etc.), or the network
devices and other electrical equipment.
Depending on the types or numbers of other electrical equipment connected to the net-
work, electric shock or malfunction/failure of the electrical equipment may occur.
For installation of the network isolation transformer, consult NIDEK or your authorized
distributor.
• Accessory equipment connected to the analog and digital interfaces must be certified
according to the representative appropriate national standards (for example, UL
60950-1 for Data Processing Equipment, UL 60601-1 for Medical Equipment, and CSA
C22.2 No. 601-1, EN 60601-1, and IEC 60601-1.) Furthermore, all configurations shall
comply with the system standard IEC 60601-1. Anyone who connects additional
equipment to the signal input part or signal output part configures a medical system,
and is therefore responsible that the system complies with the requirements of the
system standard IEC 60601-1. If in doubt, consult the technical service department or
your local representative.
• Should the device fail, disconnect the power cord from the wall outlet, then contact
NIDEK or your authorized distributor without touching the interior of the device.
• If the device is used after a long period of disuse, check for any abnormality before
use.

VII
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CAUTION
• During installation and operation of the device, observe the following instructions
about EMC (electromagnetic compatibility):
- Do not use the device simultaneously with other electronic equipment to avoid electro-
magnetic interference with the operation of the device.
- Do not use the device near, on, or under other electronic equipment to avoid electro-
magnetic interference with the operation of the device.
- Do not use the device in the same room with other equipment such as life-support
equipment, equipment that has major effects on the life of the patient and results of
treatment, or any other measurement or treatment equipment that involves small
electric current.
- Do not use the device with portable and mobile radio frequency communication sys-
tems because that may have an adverse effect on operation of the device.
- Do not use cables and accessories that are not specified for the device because that
may increase the emission of electromagnetic waves from the device and decrease
the immunity of the device to electromagnetic disturbance.
• This device is classified as Group 1 set by ISO 15004-2: 2007 Light Hazard and
conforms to the standard.

VIII

{Patient environment
The patient environment is the volume of space in which contact can occur between the patient and
any part of the device (including connected devices) or between the patient and any other person(s)
touching the device (including connected devices).
Use devices that comply with IEC60601-1 in the patient environment. If any device that does not com-
ply with IEC 60601-1 is to be used, use an isolating transformer or common protective grounding.
Radius of 1.5 m
1.5 m 1.5 m
2.5 m

IX
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After use
CAUTION
• This device uses a heat-sensitive printer paper. The paper degrades over time and the
printed characters may become illegible.
If glue containing organic solvents or adhesives such as on adhesive tape comes in
contact with the printer paper, the printed characters may become illegible.
To keep the printed data for a long period of time, make copies of the printouts or write
the measured results down.
• When the device is not in use, turn off the power switch and put the dust cover over
the device.
If not, dust may affect the measurement accuracy.
• Do not pull the power cord to disconnect it from a wall outlet but hold the plug.
This can damage the metal core of the cord and may result in fire, short circuit or elec-
tric shock.
• Occasionally clean the prongs of the main plug with a dry cloth.
If dust settles between the prongs, the dust will collect moisture, and short circuit or fire
may occur.
• If the device will not be used for a long time, disconnect the power cord from the wall
outlet.
Fire may occur.
• Maintain the surrounding temperature and humidity in the following ranges during
transport and storage of the device.
Environmental conditions
Temperature: –10 to 55ºC (14 to 131ºF)
Humidity: 10 to 95% (non-condensing)
Atmospheric pressure: 700 to 1060 hPa
A place with low dust
A place not exposed to water
A place not exposed to direct sunlight
• When transporting, set the mode to Packing mode and pack the main body in the
original packing material with the fixing lever unlocked.
Excessive vibration or impact may cause device malfunction.
For packing mode setting, see “{Shutoff before transporting the device” (page 35).

X

Maintenance
Disposal
CAUTION
• The manager of this device must perform maintenance every 6 months.
For details of the maintenance, contact NIDEK or your distributor.
When the maintenance cannot be performed oneself, entrust them to NIDEK or your
distributor.
• Only service technicians properly trained by NIDEK can repair the device.
NIDEK is not responsible for any accidents resulted from improper servicing.
• When performing maintenance work, secure sufficient maintenance space.
Maintenance work in an insufficient space may result in injury.
• Before performing maintenance, wipe the surface of the device properly for
disinfection.
• Be sure to use only the printer paper (80620-00001) specified by NIDEK.
WIthout the printer paper, proper printing may not be achieved.
• When the device is sent back to NIDEK for repair or maintenance, wipe the surfaces
(especially, the area where patients contact) of the device with a clean cloth
dampened with ethyl alcohol for disinfection.
• Contact NIDEK or your authorized distributor to check whether the device needs
measurement accuracy calibration if the AR-measured results are substantially
different from subjectively measured results.
• Do not use the device beyond its service life.
Even with proper maintenance and check, after time, the device reliability or safety may
begin to fail to achieve the target values.
CAUTION
• Follow local governing ordinances and recycling plans regarding disposal or
recycling of device components. Especially when disposing of the lithium ion battery,
circuit board, plastic parts that contain brominated flame retardant, LCD, or power
cord, be sure to follow the local governing ordinances.
Follow the local governing ordinances and recycling plans when disposing of the circuit
board with the lithium battery. Inappropriate disposal may contaminate the environment.
• When disposing of packing materials, sort them by material and follow local
ordinances and recycling regulations.
Inappropriate disposal may contaminate the environment.

Table of Contents
XI
1. BEFORE USE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Outline of the Device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.2 Intended Use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.3 Principles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
1.4 Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
1.5 Measurement Screen Layout. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.6 Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
1.7 Checking Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
1.8 Before First Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
2. OPERATING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . 23
2.1 Operation Flow. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
2.2 Preparation for Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
2.2.1 Checking the measuring window cleanliness at device start-up. . . . . . . . . . . . . . .32
2.2.2 Switching to manual mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
2.2.3 Sleep mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
2.2.4 Finishing the measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
2.3 AR (refractive error) and KM (corneal curvature radius) Measurements:
AR/KM Measurement Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36
2.3.1 Cataract measurement mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
2.3.2 Measurement ring image display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46
2.3.3 KM peripheral measurement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47
2.4 AR (refractive error) Measurement: AR Measurement Mode. . . . . . . . . . . . . .48
2.5 KM (corneal curvature radius) Measurement:
KM Measurement Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
2.6 Vision Comparison Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
2.6.1 Importing LM Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57
2.7 CS (Corneal Size) Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .58
2.8 PS (Pupil Size) Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60
2.9 PD (Pupillary Distance) Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
2.9.1 Auto PD measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
2.9.2 Manual PD Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62
2.10 Sagittal Radius Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
2.11 Measuring Hard Contact Lenses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67
2.12 Printing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
2.12.1 Printing measured data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
2.12.2 Eyeprint. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72

:
XII
2.12.3 Printing parameter settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
2.13 Parameter Settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
2.13.1 Parameter tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
2.13.2 Setting and confirming the network communication function (LAN). . . . . . . . . . . . 91
2.13.3 Setting the date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
2.13.4 Entering comments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
3. OPERATION WHEN PERIPHERAL DEVICES ARE
CONNECTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
3.1 Connecting to the NIDEK Motorized Refractor (RT) or Computer . . . . . . . . . 99
3.1.1 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99
3.1.2 RS-232C connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
3.1.3 Network connection (LAN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
3.2 Connecting to the NIDEK Auto Lensmeter (LM) . . . . . . . . . . . . . . . . . . . . . . . . 102
3.2.1 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
3.2.2 Connecting procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
3.2.3 Operating procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
3.3 Reading Patient ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
3.3.1 Connecting procedure of barcode scanner / magnetic card reader . . . . . . . . . . . 104
3.3.2 Operating procedure of barcode scanner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
3.3.3 Operating procedure of magnetic card reader . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
4. MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
4.1 Troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
4.2 Error Messages and Countermeasures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
4.3 Replacing Printer Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
4.4 Fixing Chinrest Paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
4.5 Checking the AR/KM Measurement Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . 116
4.6 Cleaning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
4.6.1 Cleaning the measuring window. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
4.6.2 Cleaning the printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
4.7 List of Replacement Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
5. SPECIFICATIONS AND ACCESSORIES . . . . . . . . . . . 121
5.1 Classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
5.2 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
5.3 Standard Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
5.3.1 Standard accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

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5.3.2 Optional accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
6. EMC (ELECTROMAGNETIC COMPATIBILITY) . . . . . . 127
7. GLOSSARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
8. INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

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1
1
1. BEFORE USE
1.1 Outline of the Device
The NIDEK ARK-530A/ARK-510A is an auto ref/keratometer which contains both a refractometer and
keratometer in one unit. The refractometer objectively measures refractive errors of sphere, cylinder,
and axis for lenses that correct the patient’s vision into emmetropia. The keratometer measures the
corneal curvature radius (corneal refractive power), principal meridian direction and corneal cylindrical
power.
Refraction is mainly performed as a reference for lens prescription to correct the visual acuity using
glasses or contact lenses.
The corneal curvature radius measurement is mainly performed for the following purposes:
xLens prescription for correction of visual acuity using contact lenses or such.
xDetermination of the power of intraocular lenses to be implanted after cataract surgery.
xPostoperative follow-up of corneal shape
This device is a single unit with the main body mounted on a base. The base is provided with a chin-
rest on the patient side and an Eye Care card reader/writer that saves measured results on the opera-
tor side. The measuring unit is provided with an LCD panel, operating buttons, joystick, and printer to
facilitate alignment and other operations.
The device offers the following features in addition to the above features:
xThe ARK-530A is provided with an auto tracking mechanism that automatically achieves
alignment in the up-and-down, right-and-left directions and focusing.
xThe ARK-510A is provided with an auto tracking mechanism that achieves alignment in the
up-and-down direction.
x An auto shot function is provided; measurements to be taken automatically when the
device is best aligned and focused.
xAmotorized up-and-down chinrest allows the operator to easily adjust the height of the
chinrest.
xAn IC card (Eye Care card) reader/writer is included as standard equipment to cordlessely
exchange data with other devices.
xA built-in RS-232C interface allows data export to computers and such.
xEthernet LAN support allows measured data and ring image data to be output to a com-
puter.
xA vision comparison function and measurement ring image display function are provided.
1.2 Intended Use
The Auto Ref/Keratometer ARK-530A/ARK-510A is a medical appliance which performs measure-
ment of the refractive errors of the eye, corneal radius of curvature.

2
BEFORE USEPrinciples
1.3 Principles
Fine measurement beams are projected on the fundus of the patient’s eye by a projecting optical sys-
tem and then computation is performed by capturing the reflected beams as a ring image to measure
the refractive errors (SPH, CYL, AXIS) of the patient’s eye. Calculation is also performed by capturing
the mire ring projected on the patient’s cornea as an image to measure the corneal curvature radius
(refractive power) and the principal meridian direction.

3
BEFORE USEConfiguration
1
1.4 Configuration
{Front view
Function buttons
Set the device and switch the screen.
Functions assigned to the function buttons are displayed by icons on the screen.
Two buttons on the left of the screen have unique functions when the measurement screen is displayed.
• Clear button ( )
Erases the measured data.
When the clear button is held for about a second, all the measured data is erased.
Function buttons
LCD
Memory indicator
Start button
Joystick
Eye Care card slot
Locking lever
Power switch
Printer cover
Cover open button

4
BEFORE USEConfiguration
• Print button ( )
Pressing this button when the memory indicator is lit, prints out the measured data.
Pressing the button when the memory indicator is not lit, advances printer paper.
LCD
5.7-inch LCD. Pulling the bottom of the display panel provides an
adjustable viewing angle.
For measurement in a standing posture, set the panel at a suitable
angle. The panel is reset to its original position by magnet.
Memory indicator
Indicates that measured data is being saved in memory.
Start button
When the start button is pressed, measurement is taken regardless
of the alignment or focusing condition of the device.
Joystick
Used for alignment and focusing.
Alignment in the side-to-side direction can be performed by moving the joystick to the right and left. Rotating the
joystick is for alignment in the up-and-down direction. For focusing, move the joystick forward and backward.
Eye Care card slot
An Eye Care card is inserted here.
AR measured values (S, C, A) of both eyes, KM measured values and PD value can be saved to the card. LM data
used for the vision comparison function can also be read from the Eye Care card.
Locking lever
Secures the main body to the base.
To lock the main body, press the locking lever down.
Power switch
Turns on the power to the device.
Printer cover
Protects a printer equipped with an auto cutter. Open the printer cover for replacing printer paper by pressing
the cover open button.
Cover open button
Opens the printer cover.
ON Being saved
OFF Not being saved
Blink Sleep mode
Eye Care card is inserted before measurement. Data is saved to the card upon printing.
Eye Care card is inserted after measurement. Data is saved to the Eye Care card when the card
is inserted.