Nidek Medical ARK-1S User manual

AUTO REF/KERATOMETER
AUTO REF/KERATOMETER
ARK-1s
ARK-1s
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]
October 2014
30713-P902-D
Printed in Japan
Original instructions
2013 NIDEK CO., LTD.
C

I
30713-P902-D
Before Use
This Operator's Manual contains information necessary for the
operation of the NIDEK AUTO REF/KERATOMETER ARK-1s.
This manual includes operating procedures, safety precautions,
specifications, and information about accessories and mainte-
nance. This manual is necessary for proper use. Especially, the
safety precautions and operating procedures must be thoroughly
understood prior to the operation of the device.
Keep this manual handy for reference.
If you encounter any problems or have questions about the
device, please contact NIDEK or your authorized distributor.

II
Table of Contents
1. SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 For Safe Use - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -1
1.2 Usage Precautions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2
1.3 Labels and Symbols - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -7
2. INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Device Outline - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -9
2.1.1 Intended use - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -9
2.1.2 Principles - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -9
2.2 Configuration and Functions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -10
2.2.1 Device configuration - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -10
2.2.2 AR/KM measurement screen description - - - - - - - - - - - - - - - - - - - - - - - - - - -13
2.2.3 Other measurement screens - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -16
2.3 Packed Contents - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -18
2.4 Before First Use - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -19
3. OPERATING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
3.1 Operation Flow - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -21
3.2 Measurement Method - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -22
3.2.1 Eye Care card use - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -26
3.2.2 Checking the measuring window cleanliness at device start-up - - - - - - - - - - - - -28
3.2.3 Device shutdown - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -29
3.3 AR (refractive error) and KM (corneal curvature radius) Measurements - - - - -30
3.3.1 Error messages during AR or KM measurement - - - - - - - - - - - - - - - - - - - - - - -34
3.3.2 Cataract measurement mode - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -35
3.4 Uncorrected Visual Acuity Measurement (UCVA) - - - - - - - - - - - - - - - - - - - - - -36
3.5 Corrected Visual Acuity Measurement
(Subjective Refractive Error Measurement)
- - - - - - - - - - - - - - - - - - - - - - - - - - -38
3.5.1 Distance visual acuity measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -39
3.5.2 Near visual acuity measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -42
3.5.3 Contrast visual acuity / glare visual acuity measurement - - - - - - - - - - - - - - - - -45
3.6 Retroillumination Image Observation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -47
3.7 Accommodation Measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -49
3.8 Manual Measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -51
3.8.1 CS (Corneal Size) measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -51
3.8.2 PS (Pupil Size) measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -53
3.8.3 PD (Pupillary Distance) measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - -55
3.9 Sagittal Measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -57
3.10 Contact Lens Measurement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -60

III
:
3.11 Measured Value Printing - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 61
3.12 Summary Display - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 64
3.13 Operation when Peripheral Devices are Connected - - - - - - - - - - - - - - - - - - - - 66
3.13.1 Device connecting procedure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 67
3.13.2 Operating procedure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 68
4. DEVICE SETTINGS AND MAINTENANCE . . . . . . . . . . . . . . . . . 71
4.1 Troubleshooting - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 71
4.2 Error Messages and Remedies - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73
4.3 Printer Paper Replacement - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 75
4.4 Chinrest Paper Attachment - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 76
4.5 Device Parameter Settings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 77
4.5.1 Setting parameters - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 77
4.5.2 Parameter tables - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 79
4.5.3 Setting and confirming the network communication function (LAN) - - - - - - - - - - 89
4.5.4 Setting the date and time - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 92
4.5.5 Entering comments - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 93
4.6 AR/KM Measurement Accuracy Check - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 94
4.7 Cleaning - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 96
4.7.1 Cleaning the measuring window - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 96
4.7.2 Cleaning the printer - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 97
4.8 Consumable List - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 98
5. SPECIFICATIONS AND TECHNICAL INFORMATION . . . . . . . . 99
5.1 Specifications - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 99
5.2 Glossary and Abbreviations - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 101
5.3 EMC (Electromagnetic Compatibility) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 103

IV
:

1
1SAFETY PRECAUTIONS
1.1 For Safe Use
BEFORE USE, READ THIS MANUAL.
The safety precautions and operating procedures must be thoroughly understood prior to
operation of the device.
The device complies with ISO 10342 subclause 4: 2010 (Ophthalmic instruments - Eye
Refractometers) and ISO 10343 subclause 4: 2009 (Ophthalmic instruments - Ophthalmom-
eters). The dioptric powers are indicated with reference wavelength λd = 587.56 nm.
In this manual, signal words are used to designate the degree or level of safety alert-
ing. The definitions are as follows.
WARNING
Indicates a potentially hazardous situation which, if not avoided, may result in death or seri-
ous injury.
CAUTION
Indicates a potentially hazardous situation which, if not avoided, may result in minor or mod-
erate injury or property damage accident.
Even situations indicated by CAUTION may result in serious injury under certain condi-
tions.
Safety precautions must be strictly followed at all times.

2
SAFETY PRECAUTIONS: Usage Precautions
1.2 Usage Precautions
Safety of LED
Before use
CAUTION
• The device is a Class 1 LED product and the LED used for the device is safe under 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:
•Do not direct LED beams to human eyes when unnecessary.
•Do not look into the measuring window (LED light-emitting section) for a prolonged time.
•If the device cannot be used appropriately or any device problem cannot be solved, stop using the
device immediately, and contact NIDEK or your authorized distributor.
WARNING
• Connect the power plug to a grounded outlet.
Electric shock or fire may occur in the event of malfunction or power leakage.
CAUTION
• Do not use this device for any purposes other than the intended purpose.
NIDEK is not responsible for accidents or malfunctions caused by misuse.
• Be sure to read the operator’s manual prior to operation of the device to understand the safety pre-
cautions and operating procedures thoroughly. Use the accessories specified by NIDEK only.
Use of the device outside the scope of this manual may cause adverse events.
• Do not modify the device and do touch the interior of the device.
There are no parts within the device that requires servicing by the user other than printer paper.
• Install the device in an environment that meets the following conditions.
The following conditions must be maintained during use.
Ambient temperature: 10 to 35°C (50 to 95°F)
Humidity: 30 to 90% (Non-condensing)
Atmospheric pressure: 800 to 1,060 hPa
A location with low dust
A location not exposed to water
A location 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 measured 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.
• 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 measure-
ments.
• Be sure to use a (HOSPITAL GRADE) power outlet which meets the power specification require-
ments.
The device may not perform properly, or malfunction or fire may occur.

3
SAFETY PRECAUTIONS: Usage Precautions
During use
CAUTION
• 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.
A 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
power outlet.
Malfunction of the device may result.
• Install the device so that 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 any tool.
Failure to do so may interfere with disconnecting the power from the input power source in case of an
abnormality.
• Insert the plug into the connector according to the proper indication and orientation and do not apply
undue force to make the connections.
• The device should be carried by two persons holding
it at positions (A) and (B) (both right and left sides).
Avoid lifting by the forehead rest or the main unit
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 mal-
function.
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 unanticipated mal-
functions or health hazards may occur due to improper measurement.
• Before and after use of the device, and before measuring each patient, clean the chinrest and fore-
head rest with clean gauze or absorbent cotton. If necessary, dampen a cloth with rubbing alcohol
and gently wipe them off.
If chinrest paper is used, remove one piece after each patient.
• Take care not to catch hands or fingers in moving parts (measuring unit, main unit, and chinrest).
Pay particular attention to the measuring unit as it moves in each direction during auto alignment. Be
sure to also caution 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.

4
SAFETY PRECAUTIONS: Usage Precautions
CAUTION
• In the event of smoke or strange odors, immediately turn off the device and disconnect the power
plug from the power outlet. After it is certain that the smoke has stopped, contact NIDEK or your
authorized distributor.
Use 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 look at the picture of a balloon with their eyes wide open. Start 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.
• When the patient comes off from the device after measurement, instruct the patient not to stand up
while holding the chinrest support.
The device may topple over resulting in injury.
• Never press on the LCD with a hard object such as a ball-point pen. Keep magnetic objects away
from the LCD.
Malfunction of the device may result.
• There may be a few dead or constantly-lit pixels on the LCD. This does not represent failure of the
LCD; it is due to the structure of the LCD.
• Should the device fail, disconnect the power cord from the power outlet and contact NIDEK or your
authorized distributor without touching the interior of the device.
• After a long period of disuse, check for any abnormality before use.
• If the device is connected to a PC that does not comply with IEC 60601-1 (except one that uses an
AC adapter that meets the Class II requirements of IEC 60950-1), supply power to the device and
PC through isolation transformers.
Electric shock may result. Contact NIDEK or your authorized distributor for installing isolation transform-
ers.
• When connecting to peripheral equipment such as a PC through LAN port via a medical facility net-
work, insert or connect an isolation transformer between the medical electrical equipment and net-
work devices (HUB etc.), or the network devices and other electrical equipment.
Depending on the types or numbers of other electrical equipment connected to the network, electric
shock or malfunction/failure of the electrical equipment may occur. For installation of the network isola-
tion transformer, consult NIDEK or your authorized distributor.
• This device is classified as Group 1 set by ISO 15004-2:2007 Light Hazard and conforms to the
standard.
• Use devices that comply with IEC 60601-1 in the patient
environment. If any device that does not comply with IEC
60601-1 is to be used, use an isolating transformer or
common protective grounding.
The patient environment is the volume of space in
which contact can occur between the patient and any
part of the device or between the patient and any other
person(s) touching the device. Use devices that comply
with IEC 60601-1 in the patient environment. If any
device that does not comply with IEC 60601-1 is to be
used, use an isolation transformer or common protec-
tive grounding.

5
SAFETY PRECAUTIONS: Usage Precautions
After use
Maintenance
CAUTION
• This device uses a heat-sensitive printer paper. The paper degrades over time and the printed char-
acters 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 down the mea-
sured results by hand.
• When the device is not in use, turn off the power switch and place the dust cover over the device.
Dust may affect the measurement accuracy.
• Make sure that the power switch is turned off before connecting or disconnecting the power cord to
or from the power outlet.
If the power cord is connected or disconnected with the power switch on, device malfunction may occur.
• If the device is not to be used for a long time, disconnect the power cord from the power outlet.
• Maintain the surrounding temperature and humidity in the following ranges during transport and stor-
age of the device.
Ambient temperature: -10 to 55°C (14 to 131°F)
Humidity: 10 to 95% (Non-condensing)
Atmospheric pressure: 700 to 1,060 hPa
A location with low dust
A location not exposed to water
A location not exposed to direct sunlight
• When transporting, set the mode to packing mode and pack the main unit in the specified packing
material with the fixing lever unlocked. In addition, avoid vibration or shock to the device.
Excessive vibration or shock may reduce the device reliability.
Setting packing mode
 “O Shutdown for transportation” (page 29)
CAUTION
• Maintenance of the device must be performed every 6 months.
For maintenance details, contact NIDEK or your distributor. If maintenance cannot be performed by the
user, request assistance from NIDEK or your distributor.
• Only service personnel trained by NIDEK can repair the device.
NIDEK will not be responsible for accidents caused by improper servicing.
• Before performing maintenance, wipe the surface of the device properly for disinfection.
• When the device is sent back to NIDEK for repair or maintenance, wipe the surfaces of the device
(especially, the areas that come into contact with the patient) with a clean cloth dampened with rub-
bing alcohol.
• If the AR-measured results are substantially different from subjectively measured results, contact
NIDEK or your authorized distributor to check whether the device needs measurement accuracy cal-
ibration.
• Do not use the device beyond its service life.
Even with proper maintenance and check, after time, the device reliability or safety may become
degraded and fail to achieve the target values.

6
SAFETY PRECAUTIONS: Usage Precautions
Disposal
CAUTION
• Follow local governing ordinances and recycling plans regarding disposal or recycling of device
components, particularly when disposing of the lithium ion battery, circuit board, plastic parts that
contain brominated flame retardant, LCD, or power cord.
Inappropriate disposal may contaminate the environment.
• When disposing of packing materials, sort them by material and follow local ordinances and recy-
cling regulations.
Inappropriate disposal may contaminate the environment.

7
SAFETY PRECAUTIONS: Labels and Symbols
1.3 Labels and Symbols
To call attention to users, labels and indications are provided on the device. If labels are peeling off,
characters are fading, or otherwise becoming illegible, contact NIDEK or your authorized distributor.
Indicates that the operator is advised to refer to the related instructions in the operator’s
manual.
Indicates that the degree of protection against electric shock is of a Type B Applied Part.
The applied parts are the forehead rest and chinrest.
 “2.2.1 Device configuration”
(page 10)
Indicates that the state of the power switch. When this symbol side of the switch is
pressed down, power is not supplied to the device.
Indicates that the state of the power switch. When this symbol side of the switch is
pressed down, power is supplied to the device.
Indicates that the device must be supplied only with alternating current.
Indicates the year of manufacture.
Indicates the manufacturer.
CE marking
Indicates that the product conforms fully to the requirements of the Medical Device
Directive (93/42/EEC).
This device is classified as a Class IIa product according to the Medical Device Direc-
tive.
Indicates that this product is to be disposed of in separate collection of electrical and elec-
tronic equipment in EU.
Indicates an input terminal.
Indicates an output terminal.

8
SAFETY PRECAUTIONS: Labels and Symbols
$8725()5$&72.(5$720(75(
0$
$8725().(5$720(7(5
$8725()5$&7248(5$7Ä0(752
$8725()5$7720(752&+(5$720(752

9
2INTRODUCTION
2.1 Device Outline
The NIDEK AUTO REF/KERATOMETER ARK-1s measures spherical, cylindrical refractive errors,
and cylinder axis from the refractive status of the patient’s eye. In addition, subjective test is per-
formed with the built-in charts and lenses for subjective measurement.
The keratometer measures the corneal curvature radius (corneal refractive power), principal meridian
directions, and corneal cylindrical power.
2.1.1 Intended use
The AUTO REF/KERATOMETER ARK-1s is a medical device which measures objective, subjective
refractive errors, and corneal curvature radius of the patient’s eye. This device also offers retroillumi-
nation mode for observing the condition of the ocular media, and measures the amplitude of accom-
modation.
2.1.2 Principles
Objective refractive error measurement
Fine measurement beams are projected on the fundus of the patient’s eye by a projecting optical
system and then the ring image obtained from the reflected beams is used for computation to
determine the refractive errors (SPH, CYL, AXIS) of the patient’s eye.
Subjective refractive error measurement
The chart for which the refraction distance is optically corrected and trial lens located in the line
of the patient’s eye allow the subjective refractive error measurement and visual acuity test. The
spherical power of trial lenses is changed by adjusting the distance from the patient’s eye.
Corneal curvature radius measurement
The image of the mire ring projected on the patient’s cornea is captured and used for computa-
tion to determine the corneal curvature radius (refractive power) and the principal meridian direc-
tions.
Retroillumination mode
Light is shone into the eye and an image obtained by the reflected light from the fundus allows
the condition of the ocular media to be observed.
Accommodation measurement
Continuous refractive error measurement based on the objective refractive errors taken of the
patient’s eye while fixated on a moving a chart allows accommodation to be determined.

10
INTRODUCTION: Configuration and Functions
2.2 Configuration and Functions
2.2.1 Device configuration
1LCD
6.5-inch color LCD. Pulling the bottom of the display panel provides
an adjustable viewing angle.
2Function buttons
Sets the device and switches the screen. Functions assigned to the function buttons are displayed by
icons on the screen.  (page 13)
3Memory indicator
Indicates that measured data is being saved in memory. The indicator illuminates when data is being
saved in memory. In sleep mode*1, the indicator blinks.
4Printer cover
±
²
³
µ
¶
´
·
¸
¹
±°
±±
±²
±³
*1. The device goes into sleep mode (LCD OFF) automatically to save power if no button has been pressed for a certain period of
time with power on. The time that the device goes into sleep mode can be selected from 5 minutes, 10 minutes, 15 minutes, or
NO (not enter sleep mode) by the “63. SLEEP” parameter. (The factory setting is 5 minutes.)

11
INTRODUCTION: Configuration and Functions
5Start button
When the start button is pressed, measurement starts regardless of the alignment or focusing condi-
tion.
6Joystick
Used for alignment and focusing.  (page 23)
7Eye Care card slot
An Eye Care card is inserted here.  (page 26)
8Measuring unit
9Cover open lever
Lift this lever to open the printer cover.
10 Main unit
11 Locking lever
Secures the main body to the base.
12 Base
13 Power switch
14 Forehead rest
15 Measuring window
16 Chinrest
17 Eye level marker
The height of the chinrest should be adjusted so that the patient’s eye roughly aligns with this line.
±¶
±´
±µ
±¸
±¹
±·

12
INTRODUCTION: Configuration and Functions
18 Chinrest up/down button ( / )
When the chinrest is at the highest (or lowest) mechanical limit, the limit indicator (or ) is dis-
played on the screen.
19 PD window
An LED is provided to detect the PD value.
20 USB port
The optional barcode scanner or magnetic card reader is connected here.  (page 67)
21 LAN port
A LAN cable is connected here to export measured data to an external computer over a LAN connec-
tion.
22 RS-232C port
A communication cable is connected here to send/receive measured data to/from an optometry
device or such.
23 Power inlet
CAUTION
• Equipment connected to the analog or digital interfaces must be certified according to the represen-
tative appropriate national standards (such as EN 60601-1 and IEC 60601-1). Furthermore, all con-
figurations 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 of your local representative.
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INTRODUCTION: Configuration and Functions
2.2.2 AR/KM measurement screen description
The screen for AR (refractive error) and KM (corneal curvature radius) measurements is comprised of
three pages.
The pages differ only in the function icons displayed to the right of each screen.
1Patient’s eye (R/L)
2Function icons
The functions assigned to the function buttons on the right and left sides of the screen are displayed
as icons.
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R/K Selects measurement mode (AR/KM, AR, or KM).
Auto Selects auto tracking mode (3D, 2D, OFF) and auto shot mode (ON, OFF).
Clear Holding down the button for about a second erases all the measured data.
Print Pressing the button while the memory indicator is lit prints the measured results.
Pressing the button while the memory indicator is not lit advances printer paper.
VA
Displays the corrected visual acuity measurement screen (SUBJECT).
Holding down the button for about a second displays the uncorrected visual
acuity measurement screen (VA TEST).
Accommodation
measurement Displays the accommodation measurement screen (ACCOMMODATION).
Ring image / retroil-
lumination
Displays the ring image in full screen when a thumbnail of the ring image is dis-
played.
Holding down the button for about a second displays the retroillumination image
observation screen (RETRO ILLUMINATION).
/ / Page switch Switches the measurement screen among Page 1, Page 2, and Page 3.
CS/PS/PD Switches from AR/KM measurement to CS/PS/PD measurement.
Sagittal Displays the sagittal measurement screen (SAGITTAL).
Eye print Prints the eye diagram of measured data.
CYL mode Switches cylinder (cylindrical refractive error) mode.

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INTRODUCTION: Configuration and Functions
3Measured results display
The latest measured results are displayed.
4Heater indication
Displayed when the anti-fog heater of the measuring window is operating. The heater is activated or
deactivated automatically.
5Measurement ring image thumbnail
A thumbnail of the latest measurement ring image is displayed when AR measurement is performed.
 (page 33)
When the screen returns from the ring image full screen to the normal screen, no thumbnail is displayed.
6Auto tracking icon
Indicates the setting of the auto tracking function (alignment in the up, down, left, and right, directions
and focusing in the forward and backward direction).  (page 23)
Parameter Holding down the button for about a second displays the parameter setting
screen.
• With the parameter setting, the summary button can be displayed instead of the print
button. Pressing the summary button displays the summary screen that shows various mea-
surement values at the same time.  (page 64)
E PS: Pupil Size
F CS: Corneal Size
G PD: Pupillary Distance
A R: Number of AR measurements C K: Number of KM measurements
B
AR latest values
S: Spherical refractive error
C: Cylindrical refractive error
A: Cylinder axis
* The number in parentheses indicates a
confidence index.
D
KM latest values
R1: Corneal curvature radius and axis angle in the
steepest meridian direction
R2: Corneal curvature radius and axis angle in the flat-
test meridian direction
• KM latest values can be changed to “AVE, CYL” by the “12. KM DISPLAY” parameter.
AVG: Average of R1 and R2
CYL: Corneal cylindrical power and corneal cylinder axis angle
Auto tracking in the forward-backward, side-to-side, and up-and-down directions
becomes active.
Auto tracking in the side-to-side and up-and-down directions becomes active.
(No icon) Alignment and focusing are manually performed.
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