Nidek Medical ARK-500A User manual

AUTO REF/KERATOMETER
Model ARK-500A
OPERATOR’S MANUAL

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 pressed for about a second, all the measured data is erased.
Function buttons
LCD
Memory indicator
Start button
Joystick
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 back and forth.
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
Inside is the printer equipped with the auto cutter located. Open the printer cover for replacing printer paper
by pressing the cover open button.
Cover open button
To open the printer cover, press the button.
ON Being saved
OFF Not being saved
Blink Sleep mode

5
BEFORE USE: Configuration
1
{Rear view
Forehead rest
During measurement, the patient’s forehead should be gently rest against the forehead rest.
Clean the chinrest for each patient.
Measuring window
Check the window cleanliness before measurement.
Chinrest
Clean the chinrest for each patient.
Eye level marker
Used as a guide for the patient’s eye level during measurement.
The height of the chinrest should be adjusted so that the center level of the patient’s eye almost aligns with this line.
Chinrest up/down buttons ( , )
Move up or down the chinrest.
PD window
An LED is provided to detect the PD value.
Eye level marker
Chinrest up/down buttons
PD window
Forehead rest
Measuring window
Chinrest
• Parts that come into contact with the patient during measurement are composed of the
following materials.
Forehead rest: Elastomer
Chinrest: ABS resin

6
BEFORE USE: Configuration
{Bottom view
Power inlet
Connect a detachable power cord.
RS-232C ports
Connect a communication cable to send/receive the measured data to/from a diagnostic device or such.
Target device
RT-1200 series, RT-2100 series, RT-5100
LM-500, LM-970, LM-990/990A, LM-1000/1000P, LM-1200
Connecting the lensmeter to the side and the RT-2100/RT-5100 to the side allows data transmission to
the connected refractor via the ARK-500A.
USB-A port
Connect the optional barcode scanner.
Do not connect equipment other than the barcode scanner.
*1 Accessory equipment connected to the analog and digital interfaces must be certified according to the representative
appropriate national standards (for example, UL 1950 for Data Processing Equipment, UL 60601-1 for Medical Equip-
ment, and CSA C22.2 No. 601-1, EN 60601-1, and IEC 60601-1.) Furthermore, all configurations shall comply with the
system standard IEC 60601-1-1. 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 60601-1-1. If in doubt, consult the technical service department or your local representative.
USB-A port
Power inlet
RS-232C ports
(OUT)
To export the measured data to the refractor (RT), an external computer or such,
connect a communication cable to this side.
The optional Eye Care card system is connected to this side.
(IN) To import the measured data to from a NIDEK lensmeter, connect a communication
cable to a lensmeter.

7
BEFORE USE: Measurement Screen Layout
1
1.5 Measurement Screen Layout
The screen for AR (refractive error) and KM (corneal curvature radius) measurements is comprised of
pages 1 to 3.
Each page differs only in the touch icons displayed to the right of the screen.
<When Page 1 is displayed>
Patient’s eye
Indicates the right or left eye of the patient.
R/K button ( )
Selects a measurement mode in R/K measurement.
Select from AR/KM measurement mode, AR measurement mode or KM measurement mode. The selected
measurement mode is displayed on the screen.
The measurement mode switches in the following order: AR/KM measurement mode (successive AR and KM
measurements) →AR measurement mode (AR measurement)→KM measurement mode (KM measurement)→
AR/KM measurement mode......
Target
Used as a guide to locate the patient’s eye in the center of the screen. Align the mire ring projected on the
patient’s eye with the target.
Auto button ( )
Selects the auto-tracking function and auto-shooting function.
Select auto-tracking from (UpDown) or OFF. Select auto-shooting from ON or OFF.
Patient’s eye
R/K button
Target
Auto button
Minimum pupil circle
Measured values
CYL mode
CS/PS/PD button
Focusing indicator
Manual mode button
Ring image enlarge-
ment button
Mire ring
Page button
Auto-tracking indication
Auto-shooting indication

10
BEFORE USE: Measurement Screen Layout
<When Page 2 is displayed>
* CS, PS, and PD data, ID indication, Eye Care card and cataract measurement mode indication
are displayed on each page.
CAT measurement mode indication ( )
Indicates that the eye has been measured in cataract measurement mode.
If cataract or abnormal eyes cannot be measured, cataract measurement mode is automatically turned on.
See “2.3.1 Cataract measurement mode” (page 37) for details on cataract measurement mode.
PS (Pupil Size) indication
Displayed when PS (Pupil Size) is measured. (increments: 0.1 mm)
CS (Corneal Size) indication
Displayed when CS (Corneal Size) is measured. (increments: 0.1 mm)
ID indication ( )
Displayed when the patient ID is entered.
Enter the patient ID using the optional barcode scanner.
CYL mode button ( )
Switches cylinder mode, the reading direction of cylinder data in which CYL data is represented.
Cylinder mode can be switched even after measurement.
Data is printed out with the mode status at the time of printing.
CAT measurement mode in-
dication
PS (Pupil Size) indication
CS (Corneal Size) indication
ID indication
PD (Pupillary Distance) indication
CYL mode button
Eyeprint button
CYL- Indicates the cylindrical power by - reading.
CYL+ Indicates the cylindrical power by + reading.
CYL±
Cylinder data is indicated by + reading when the refractive error is positive for any axis
angle.
Indicates the cylindrical power by - reading in other cases.

13
BEFORE USE: Labels
1
1.6 Labels
Cautionary labels are provided on the device.
If labels are curling up or characters fading and becoming barely legible, contact NIDEK or your autho-
rized distributor.
Indicates that caution must be taken. Refer to the operator’s manual before use.
Indicates a Type B applied part as a degree of protection against electric shock for applied parts.
Indicates that the state of the power switch. When the symbol side of the switch is pressed
down, power is not supplied to the device.
Indicates that the state of the power switch. When the 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 input part.
Indicates the output part.
Indicates the date of manufacture.
Indicates the manufacturer.
Indicates that this product shall be disposed of in a separate collection of electrical and
electronic equipment in EU.

14
BEFORE USE: Checking Contents
1.7 Checking Contents
Unpack the contents from the shipping carton and check them.
The following are included in the standard configuration.
[Bottom side]
• Main body
• Printer paper (3 rolls)
• Power cord
• Dust cover
• Pack of chinrest paper
• Fixing pins for chinrest paper (2 units)
• Operator’s manual (this book)
• Model eye for R/K measurement/Contact Lens (CL) holder (integral type)

15
BEFORE USE: Before First Use
1
1.8 Before First Use
Place the device on a stable table and connect a power cord to it.
1 Place the main body on a stable table.
2Pull the main body fully to the side on which
the device is laid down, lock the main body to
the base unit with the locking lever and lay the
device down gently.
3Connect the power cord to the power inlet.
4Connect peripheral devices if necessary.
See “3 OPERATION WHEN PERIPHERAL DEVICES ARE CONNECTED” (page 77) for the
method of connecting peripheral devices.
5Stand the device upright.
6Confirm that the power switch is turned OFF
( ) and plug the power cord into a wall out-
let.
Power inlet
Power switch
CAUTION
• Be sure to use an outlet equipped with a ground terminal.
Electric shock or fire may occur in the event of device malfunction or power leakage.