Yeasn YPA-2100 User manual

YPA-2100
DIGITAL
REFRACTOR
User Manual
Version: 1.0
Date: 20180521

Preface
Thank you for purchasing and using our digital refractor.
Please read this User Manual carefully before using this device. We sincerely
hope that this User Manual will provide you with sufficient information to use the
device.
Our pursuit is to provide people with high-quality, complete-function and more
personalized devices. Information in promotional materials and packing boxes is subject
to changes due to performance improvement without additional notice. Chongqing
Yeasn Science & Technology Co., Ltd. reserves the rights to update the devices and
materials.
If you have any questions during using, please contact at our service hotline: (86-023)
62797666, we will be very happy to help you.
Your satisfaction, our impetus!

Content
1. Specifications ............................................................................................................... 1
1.1 Measurement range ............................................................................................ 1
1.2 Host..................................................................................................................... 1
1.2.1 Assistant lens ........................................................................................... 1
1.2.2 Adjustment range..................................................................................... 2
1.3 Power parameters ............................................................................................... 2
1.4 Dimensions ......................................................................................................... 2
1.5 Weight ................................................................................................................ 2
2. Safety Precautions ........................................................................................................ 2
3. Main Structure .............................................................................................................. 5
3.1 Host..................................................................................................................... 5
3.2 Printing base ....................................................................................................... 7
4. Installation Method....................................................................................................... 8
4.1 Part List .............................................................................................................. 8
4.2 Installation Instructions ...................................................................................... 8
4.2.1 Install the device onto the compound table ............................................. 8
4.2.2 Install short-distance visual chart ............................................................ 8
4.2.3 Install short-distance vision rod............................................................... 9
4.2.4 Horizontal adjustment after installation .................................................. 9
4.2.5 Install printing paper.............................................................................. 10
4.2.6 Router settings ....................................................................................... 10
4.2.7 Install APP............................................................................................. 10
5. Directions for Use....................................................................................................... 11
5.1 Device Startup and Shutdown .......................................................................... 11
5.1.1 Device startup........................................................................................ 11
5.1.2 Device shutdown ................................................................................... 11
5.2 Operation Interface........................................................................................... 11
5.2.1 Main interface........................................................................................ 11
5.2.2 Assistant lens setup................................................................................ 16
5.2.3 Pupil distance input ............................................................................... 18
5.2.4 System parameter setup......................................................................... 20
5.3 Preparations before Use.................................................................................... 24

5.4 Standard Optometry Procedure ........................................................................ 25
5.5 Binocular Functional Testing Method.............................................................. 51
5.5.1 Crisscross matrix test (presbyopia) ....................................................... 51
5.5.2 Cross test (heterophoria)........................................................................ 51
5.5.3 Cross fixation vision test (heterophoria) ............................................... 53
5.5.4 Cross ring test (heterophoria) ................................................................ 54
5.5.5 Horizontal coincidence test (horizontal image inequality and horizontal
heterophoria)................................................................................................... 55
5.5.6 Vertical coincidence test (vertical image inequality and vertical
heterophoria)................................................................................................... 55
5.5.7 Horizontal Maddox rod test (horizontal heterphoria)............................ 56
5.5.8 Horizontal Maddox rod test (horizontal heterphoria)............................ 57
5.5.9 Clock test (rotatory heterophoria).......................................................... 58
5.5.10 Worth 4 dot test ................................................................................... 59
5.5.11 Stereopsis............................................................................................. 60
5.5.12 Divergence test .................................................................................... 61
5.5.13 Congregation test................................................................................. 62
5.5.14 Near –point congregation (NPC) test .................................................. 63
5.5.15 Near –point adjustment (NPA) test ..................................................... 64
5.5.16 Negative-relative adjustment (NRA) test ............................................ 64
5.5.17 Positive-relative adjustment (PRA) test .............................................. 65
5.6 Customer Self-programming ............................................................................ 66
5.6.1 Self-programming.................................................................................. 66
5.6.2 Run Customized Program...................................................................... 71
6.Troubleshooting........................................................................................................... 76
7.Cleaning and Protection .............................................................................................. 77
7.1 Clean the forehead baseplate ............................................................................ 77
7.2 Clean the nose baseplate................................................................................... 77
7.3 Clean the testing window ................................................................................. 77
7.4 Clean external parts .......................................................................................... 78
8.Maintenance and Care ................................................................................................. 79
9. Environmental Conditions and Service Life .............................................................. 80
10.Environmental Protection .......................................................................................... 81
11.Manufacturer’s Responsibility .................................................................................. 81
12.Symbol Description ................................................................................................... 81

13.Electrical Schematic Diagram ................................................................................... 82
14.Electromagnetic Compatibility.................................................................................. 83

1
1. Specifications
1.1 Measurement range
The measuring range conforms to the requirements in Table 1.
Table 1 Vision tester measurement range
Item Measuring range
Spherical power -29.00D~+26.75D, Step size: 0.12D, 0.25D, 1D
Cylindrical power －8.75D～＋8.75D, Step size: 0.25D, 1D
Cylindrical axis 0~180°, Step size: 1°, 5°
Prismatic power 0~20△, Step size: 0.1△, 0.5△
Prism base
0~360°, Step size: 1°, 5°. Prim base can be marked horizontally or
vertically.
1.2 Host
1.2.1 Assistant lens
a. Automatic crisscross cylinder: automatic crisscross cylinder ±0.25D and ±0.50D, one at left, one
at right (the axle is self-rotatory);
b. Fixed crisscross cylinder: fixed crisscross cylinder ±0.50D, one at left, one at right (the axle is
fixed at 90°)
c. Pinhole plate: hole diameter 1mm, one at left, one at right;
d. ross plate: used when setting pupil distance, one at left, one at right;
e. Red and green optical filter: one is red optical filter (right) and one is green optical filter (left);
f. Inear polarized optical filter: one at 135° right and one at 45° left
One at 135° right/sphere 0.125D, one at 45° left/sphere 0.125D;
g.Circular polarized optical filter: two at left, two at right, one includes sphere 0.125D;
h. Maddox rod lens: right eye: red, horizontally, left eye: white, vertically;
i. Sphere for retinoscopy: +1.5D and +2.0D, one at left, one at right;
j. Decomposing prism: right eye: 6△BU, right eye: 10△BI
k. Single-slit lens: used for quick astigmatism test, one at left and one at right.

2
1.2.2 Adjustment range
1）Adjustment range of pupil distance: 48mm~82mm
2）Forehead base can be adjusted continuously; the adjustment range should reach at least 14mm;
3）Adjustable range of near vision optometry distance: 150mm~400mm;
4）Corneal vertex marking: 12mm, 13.75mm, 16mm, 18mm and 20mm;
5）Horizontal adjustment: ±2.5°.
1.3 Power parameters
Input voltage AC 110V~220V(±10%)
Input frequency 50/60 Hz
Input power 70 VA
1.4 Dimensions
1) Host 400mm (L) × 92mm (W) × 275mm (H)
2) Printing base 200mm (L) × 200mm (W) × 80mm (H)
1.5 Weight
1) Host about 3.9kg
2) Printing base about 0.6kg
* The design and specifications are subject to changes due to technical updates without additional
notice.
2. Safety Precautions
Please read the following matters needing attention carefully in case of personal injury,
device damages or other possible hazards:
●Use the device indoors and keep it clean and dry; do not use it under inflammable, explosive, high
fever and dusty environment;
●Do not use the device near water; also be careful not to make any kinds of liquid drop onto the
device. Do not place the device in damp or dusty places, or places where humidity and temperature
change quickly;
●Make sure the device host is stably and reliably installed before using it; fall of the device host

3
may cause personal injury or device failure;
●Dedicated power adaptor configured for the device should be used: model MDS-060AAS15 B,
Input 100V- 250V～1.5-0.75A 50Hz, Output 15V 4.0A.
●Make sure the input voltage is consistent with rated input voltage and the electric wire is correctly
connected and well grounded;
●Do not use multi-pin socket or extend the power line to insert the plug of the device into power
socket;
●Unplug power line and cut off power supply line especially under emergency circumstances; hold
the power plug to pull out it from the socket rather than pulling the power cord;
●Do not touch the power line with wet hands. Check the power line and do not allow the power
cord to be stamped, pressed by heavy objects or knotted;
●Power line damage may cause fire or electric shock. Please check it regularly;
●Before testing each patient, clean the contacting part with ethanol for disinfection;
●Cut off power and put on dust cover when not using it;
●Do not dismantle or touch the interior parts of the device, otherwise it may cause electric shock or
device failure;
●The device has passed electromagnetic compatibility test, which is in accordance with YY 0505－
2012 standard. Follow below instructions related to EMC (electromagnetic compatibility) when
mounting and using the device:
- Do not use the device with other electronic devices to avoid electromagnetic disturbance;
- Do not use the device nearby other electric devices to avoid electromagnetic disturbance;
- Do not use a power adaptor that is not configured with the device, otherwise it may
increase the
- electromagnetic emission measure, which may reduce the capacity of resisting disturbance.
Caution: The user is cautioned that changes or modifications not expressly approved by the
party responsible for compliance could void the user's authority to operate the equipment.
This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device must accept
any interference received, including interference that may cause undesired operation.

4
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This equipment
generates, uses and can radiate radio frequency energy and, if not installed and used in accordance
with the instructions, may cause harmful interference to radio communications. However, there is
no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can
be determined by turning the equipment 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 antenna.
-- Increase the separation between the equipment and receiver.
-- Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
-- Consult the dealer or an experienced radio/TV technician for help.
FCC Radiation Exposure Statement:
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled
environment. This equipment should be installed and operated with a minimum distance of 20cm
between the radiator and your body.
This transmitter must not be co-located or operating in conjunction with any other antenna or
transmitter.
End user must follow the specific operating instructions for satisfying RF exposure compliance.
The portable device is designed to meet the requirements for exposure to radio waves established by
the Federal Communications Commission (USA). These requirements set a SAR limit of 1.6 W/kg
averaged over one gram of tissue. The highest SAR value reported under this standard during
product certification for use when properly worn on the body

5
3. Main Structure
3.1 Host
Front side (tester side)
Back side (testee side)
9.S
p
irit level
5. Cornea observation window
6.Testin
g
window
8.Short-distance visual chart
7.Short-distance vision ro
d
3.Forehead base
p
late knob
2.Forehead base
p
late indicator Forehea
d
1.Horizontal ad
j
ustin
g
knob
12.Cornea ali
g
nment window
11.Forehead base
p
late
4.Near vision indicato
r

6
1.Horizontal adjusting knob
Adjust the horizontal level of the vision tester.
2.Forehead baseplate indicator
Make sure the forehead of the testee contact the baseplate. The indicator is always on when the
forehead doesn’t contact the baseplate; the indicator is off when the forehead contacts the baseplate.
3.Forehead baseplate knob
Adjust the distance of the testee’s corneal vertex
4.Near vision indicator
Light up short-distance visual chart during short-distance test.
5.Cornea observation window
Observation distance should be 200mm-250mm。The window through which to observe and
confirm the distance of the tester’s corneal vertex.
6.Testing window
Light aperture for testing.
7.Short-distance vision rod
Install and support the short-distance visual chart.
8.Short-distance visual chart
For testing short-distance vision.
9.Spirit level
Confirm the horizontal location of the vision tester. Rotate the horizontal adjusting knob to keep the
air bubble in the spirit level in the middle.
10.Nose baseplate
The nose or face of the testee may contact the nose baseplate during vision test. Clean this part
before every time of vision test.
11.Forehead baseplate
The forehead of the testee may contact the forehead baseplate during vision test. Clean this part
before every time of vision test.
10.Nose
b
ase
p
late

7
12.Cornea aiming window
Shows the alignment position of the testee’s corneal vertex.
3.2 Printing base
Front
Back
1.Power switch
Turn on power switch; power indicator is lit up.
2.Printing bin
Install printing papers.
3.LAN Port
Connect to LAN (preserved port).
4.R232 serial port
Connect to lens meter LM, computer vision tester RK and PC (preserved port).
2. Printin
g
1. Power switch
6. Power in
p
ut interface
5. Power out
p
u
t
4. R232 serial
p
ort 3. LAN Port

8
5.Power output interface
Connect to the power input interface of the host.
6.Power input interface
Connect to the output interface of the power adapter.
4. Installation Method
4.1 Part List
Digital refractor 1Set
Printing bin 1Pcs
Near Vision Chart 1Pcs
Near Vision Rod 1Pcs
Power adaptor 1Pcs
Dust cover 1Pcs
Blowing balloon with brush 1Pcs
Printing paper 2Rolls
Power Cord 1Pcs
DC power cord 1Pcs
Hex wrench (2.0mm) 1Pcs
Hex wrench (2.5mm) 1Pcs
Hex wrench (3mm) 1Pcs
Stainless steel flat head set screw(M6*8) 2Pcs
4.2 Installation Instructions
4.2.1 Install the device onto the compound table
Take out 3 Pcs Stainless steel flat head set screw((M6*8) ), and then please refer to compound
table manual.
4.2.2 Install short-distance visual chart
Insert the card tray of the visual chart into the short-distance vision rod and screw the knob
tight. The card tray can slide on the rod and rotate 360°.

9
4.2.3 Install short-distance vision rod.
Insert the vision rod into the installation hole in the vision tester host and screw the knob.
Attention during installation: align the flute on the vision rod at the knob and keep the end of
the vision rod close to the end of the installation hole in the vision tester host.
4.2.4 Horizontal adjustment after installation
Rotate the horizontal adjusting knob until the air bubble in the spirit level in the middle.
S
p
irit level Horizontal ad
j
ustin
g
knob
Short-distance vision ro
d
Short-distance visual chart
Knob
Card tra
y
Flute Knob

10
4.2.5 Install printing paper
Please refer to “Replace printing paper” (see 8.1).
4.2.6 Router settings
Follow the setup guide provided by the router supplier to enter the router setup screen. Router
parameters are set as follows:
1)LAN IP ADDRESS: 192.168.1.253
2) Router working mode: Access Point mode (AP)
3)SSID：yeasn_xxxxxx (xxxxxx is consistent with the nameplate serial number)
4)WPA-PSK/WPA2-PSK PSK password：yeasn2002
5)After the setting is completed, click the "Reboot Router" button on the setting interface
4.2.7 Install APP
1) Please contact the dealer to download the dedicated APP
2) Install the APP pad recommendation: Samsung and Huawei 10-inch Android pad.
If you use other pad, fonts and images may be mismatched.
3) Connect the tablet WIFI to the router with "SSID: yeasn_xxxxxx".
4) The first time you open the app, you are prompted to enter the SSID number. The SSID
number is: yeasn_xxxxxx.

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5. Directions for Use
5.1 Device Startup and Shutdown
5.1.1 Device startup
1）Insert the power plug into the socket.
The power adaptor configured with the device is three-pin plug, please select suitable power socket.
Note: please use dedicated power line configured with the device.
2）Start up the host first: press the power switch on the printing base, the power indicator is on.
3）After the host is initialized, start up the compound laptop and open the operation interface.
5.1.2 Device shutdown
1）Press the power swtich on the printing base to turn off the device, the power indicator is off.
2）Put the dust cover on the host.
5.2 Operation Interface
5.2.1 Main interface
1
34 5 6
10
11
12
78 2 9
13
14
15
16

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1. Date
2. Test number
3. Time
4.R
Right testing window, input right eye data and select right eye as the dominant eye.
5. Measurement mode
LD: Long-distance mode, SD: short-distance mode. Press “LD” or “SD” to shift between
long-distance mode and short-distance mode.
6. PD
Press this key to display left pupil distance, right pupil distance and binocular pupil distance.
17
2
28
27
2
18192021222324
29 30 31

13
7.L
Left testing window, input left eye data and select left eye as the dominant eye.
8. Sighting mark area
Select and display sighting marks.
9. Procedure
Display current procedure.
10.S
Spherical power input window
Press S input window aside R to input the spherical power of right eye; press S input window aside
L to input the spherical power of left eye.
11.C
Cylindrical power input window
Press C input window aside R to input the cylindrical power of right eye; press C input window
aside L to input the cylindrical power of left eye.
12.A
Cylindrical axis input window
Press A input window aside R to input the cylindrical axis of right eye; press A input window aside
L to input the cylindrical axis of left eye.
13.△
Prismatic power input window
Press △input window aside R to input the prismatic axis of right eye; press △input window aside
L to input the prismatic axis of left eye.
14. Prism base input window
Press input window aside R to input the prism base of right eye; press input window aside L to
input the prism base of left eye.
15.ADD
Additional power input window
Press ADD input window aside R to input the additional power of right eye; press ADD input
window aside L to input the additional power of left eye.

14
16.VA
VA Input box
17. Operation time
Display the time spent from beginning to the end.
18. Del: data deletion
Delete displaying data
19. Print: Printing is enabled when UNA, LM, AR, SUBJ or FINAL state requires measurement
data.
20. Quick test
Under non-prism mode, click this key to do near vision test.
Under prism mode, click this key to do near vision test and also converge and diverge test.
21. Polar coordinate: prismatic power mode key
Press this key to shift prismatic power between △/(polar coordinate model) and X/Y (rectangular
coordinate model).
22. Quick Set
Click this key to quickly set spherical lens step, cylinder axis step and cylinder axis angle
23. Cylinder shift-out/shift-in
Press this key to shift in and out cylinder.
24. Cross cylinder: crisscross cylinder
Press this key to call in crisscross cylinder and Shift among 0.25XC, 0.50XC and Slit Prism.
25. Wizard
Prompt operating information.
26. Current data.
Display current data.
27. Data Report
Click this key to check test data.
28.Peripheral device connectivity status
1) :Phoropter Head is connected

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2) :LCD visual chart is connected
3) :LM is connected.
4) :Print Box is connected.
Remarks: All peripheral devices are connected automatically after powering on. If icons
disappear, the peripheral devices are not well connected.
29. System Setting
Click this key to set system
30. Right auxiliary lenses
Click this key to popup the choice box related to right auxiliary lenses.
31. Left auxiliary disc lenses
Click this key to popup the choice box related to left auxiliary lenses.