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Yeasn SLY-100 User Manual

Vision tester
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SLY-100
Vision Tester
User Manual
Version: 1.3
Revision Date: 2024.02

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Summary of Contents for Yeasn SLY-100

  • Page 1 SLY-100 Vision Tester User Manual Version: 1.3 Revision Date: 2024.02...
  • Page 2 Kullanım Kılavuzu İndirme linki: www.yeasn.com/en/ Manuale d'uso Link per il download: www.yeasn.com/en/ Link zum Herunterladen des Benutzerhandbuchs: www.yeasn.com/en/ Lien de té lé chargement du manuel d'utilisation : www.yeasn.com/en/ Линк за изтегляне на ръководството за потребителя: www.yeasn.com/en/ Naudotojo vadovo atsisiuntimo nuoroda: www.yeasn.com/en/ Link do pobrania instrukcji obsługi: www.yeasn.com/en/...
  • Page 3 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.

  • Page 4: Table Of Contents

    Content 1. Introduction ........................1 1.1 Uses ........................1 1.2 Characteristics ....................1 1.3 Main technical indexes ..................1 1.4 Nameplate and indications.................. 2 2. Safety Notice ........................ 4 3. Configuration ........................ 5 4. Assembly ........................9 4.1 Attaching Instrument to Ophthalmic Stand ............9 4.2 Attaching Near Point Rod, Near Point Card and Card Holder ......

  • Page 5: Introduction

    1. Introduction 1.1 Uses This instrument is applicable with stand and projection for precision measurement of visual functions such as myopia, hyperopia, astigmatism, visual acuity balance, phoria, stereoscopic vision and visual acuity amalgamation. Contraindications: none Target groups of patients: adults, children Intended users: optometrists in hospital ophthalmology and optical shops Specific qualifications of device users and/or other persons: have a qualification certificate for optometry and glasses.

  • Page 6: Nameplate And Indications

    1.3.9 Adjustment of Forehead Rest 16mm 1.3.10 vertex Distance 13.75mm 1.3.11 Overall Dimensions 335mm (Length)× 310mm(Width)× 90mm(Height) 1.3.12 Weight 4.5kg 1.4 Nameplate and indications Name plate and indications are sticked on the instrument to arise end-users' notice. In case the name plate is not sticked well or the characters become unclear to recognize, please contact authorized distributors.
  • Page 7 Name plate sticked on the packaging: Key to symbols of the name plate sticked on the packaging: G.W. Gross Weight DIM. Dimension Humidity range Atmospheric pressure range identification identification Country of manufacture Temperature limit Fragile, handle with This way up care Keep dry Stacking limit by 5...

  • Page 8: Safety Notice

    2. Safety Notice Please read the following precautions carefully to avoid 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 temperature and dusty environment. ●...

  • Page 9: Configuration

    3. Configuration Fig.3 Fig.4...
  • Page 10 ○ Rotation Adjustment Knob Used to adjust direction of instrument’s main body ○ Mounting Handle Used to install the instrument onto eye-optometry table ○ Clamping Screw Used to fix near-point rod ○ Leveling Adjusting Knob Used to adjust level position of the instrument ○...
  • Page 11 Aperture for test, with various lenses set here. ○ Cylindrical Lens Axis Scale Used to indicate cylindrical lens axis angle ○ Face shield chip Fix face shield ○ Fixing Hand-wheel Used to fix instrument to ophthalmic stand ○ Tightening Screw Used to fix instrument to ophthalmic stand, and stored in accessory box ○...
  • Page 12 ○ Cylindrical Lens Axis Knob Used to adjust cylindrical lens axis ○ Cylindrical Lens Knob Used to set cylindrical lens to examination aperture ○ Cylindrical Lens Axis Scale Used to display angle of cylindrical lens axis ○ Forehead Rest Patient’s forehead rests here. ○...

  • Page 13: Assembly

    Used to install the near point rods Screws Used to connect two near points rods Fig.5 Fig.6 4. Assembly 4.1 Attaching Instrument to Ophthalmic Stand a.When assembly is conducted, first insert the mounting rod extending from the ophthalmic stand to ○...

  • Page 14: Attaching Near Point Rod, Near Point Card And Card Holder

    *Notice Fastening screw (placed in accessories box) can be used to better fasten vision tester when it is not matching with the vision tester holding arm. 4.2 Attaching Near Point Rod, Near Point Card and Card Holder ○ 38 internal screw angle First, align the connection engravings of the two near point rods, then use ○...

  • Page 15: Operation Procedures

    The lenses and accessories are fixed in front of the detection window, and the instrument should be aligned and centered. Inspection cycle: before use every day. 6. Operation Procedures 6.1 Spherical Lens ○ To show the spherical power only (shortened as "S"), turn auxiliary lens knob 21 to O position, ○...

  • Page 16: Auxiliary Lens

    Fig.13 Fig.14 6.3 Auxiliary Lens ○ Turn auxiliary lens knob 21 , the required symbol is to be set at 12 o'clock position. Then ○ Corresponding referenced lens will appear in the examination aperture 13 (Fig.15 and Fig.16). Fig.15 Fig.16 The meaning of each mark.

  • Page 17: Cross Cylindrical Lens

    Polaroid filter, used for polarizing testing of stereoscopic visionand binocular balance of stereoscopic vision Retinoscopic lens; +1.50D spherical lens (67cm) 10∆I 10 diopter base in prism, used for vertical phoria test Green color-filter lens MR：Maddox rods，WH：White，Horizontal MR：Maddox rods，WV：White，Vertical To change direction of cross cylinder lens and polaroid filter, first remove the retaining ring and ○...

  • Page 18: Rotary Prism

    Fig.18 Fig.19 Fig.20 6.5 Rotary Prism ○ 12 by holding its base to set it on the examination aperture. Turn prism rotation Turn rotary prism ○ 11 until the required prism power is set. What the black triangle arrow indicates is the knob current prism power.

  • Page 19: Corneal Aligning Device

    Fig.23 Fig.24 6.6 Corneal Aligning Device ○ ○ Turn forehead rest knob to adjust position of forehead rest 29 . After setting patient's ○ ○ forehead closely on forehead rest 29 , look through the corneal aligning aperture 10 from around 30cm away.
  • Page 20 Example 1 Assume that data of S +8.00D is obtained when the apex of the cornea positioned at the second shortest line from the longest line, meaning that it is 4mm away from the standard wearing distance. When referring to the correction factor in Table 1, it is known that the applied correction factor is +0.26D for +8.00D diopter and 4mm distance.
  • Page 21 Correction Table 1 (When Correction Value of Measured Power is in Plus (+) Region)
  • Page 22 Correction Table 2 (When Correction Value of Measured Power is in Minus (-) Region)

  • Page 23: Near Point Card

    6.7 Near Point Card If the lens is multifocal, it is required to measure lens diopter at near distance. Then near point rod ○ ○ ○ 31 , near point card 32 can be used. Lower near point rod 31 , keeping rod horizontal is the correct setting for measurement (Fig.27) Near point distance from 15cm to 70cm (i.e.
  • Page 24 determined. Example: Testee, 35 years old, who wears spectacles. First, use lensmeter to measure the spectacles he is wearing, with following results: 63mm －1.00DS/－0.50DC 90° －1.25DS/－0.50DC 180° Examining results show pupil distance of Testee is 63mm; spherical power of his right eye is -1.00D, with astigmatic power of -0.50D, and axis 90°;...
  • Page 25 ○ example of Testee , reduce S value gradually by turning weak spherical power dial 23 : 2.00→ 1.75→1.5→0.5 until it shows -1.00 D. Fig.30 Fig.31 (3)Project the astigmatic chart while asking Testee if he can see it. If Testee says he can see it as ○...
  • Page 26 6.8.3 Precise Refining Cylinder Axis and Power ○ ○ (1) Set cross cylindrical lens 20 in front of Testee's right eye and, turning rotation knob axially, to align it with axial direction of cylindrical lens (see Fig.33). ○ (2) Project the cross cylinder dot chart as shown in Fig.34. Turn rotation knob 19 with finger to ○...
  • Page 27 (6) Use cross cylinder dot chart shown in Fig.34 with same procedure as described in (2). Now ask Testee to compare the charts he sees. The result is shown as Fig.38. If Testee sees the clearest chart when red dot matches with letter P (as shown in Fig.38), it means Testee's diopter has increased by 0.25D (now Testee's diopter power is 0.75D).
  • Page 28 Spherical power 1.50 Cylinder power 0.50 and Axis 100° R -1.50DS/-0.50DC 100° ○ Then examine the left eye. Turn auxiliary lens knob 21 , to set O for left eye, and OC for right eye. Then use same measuring method to measure left eye. Testee 's left eye is measured as: L -2.00DS/-0.50DC 170°...
  • Page 29 R -1.50DS /-0.50DC A l00° L -1.75DS /-0.50DC A l70° (2) Polarizing filter method ○ a. Turn auxiliary lens knob 21 to P (both eyes). Project the polarized binocular balance test chart. Fig.42 Fig.43 b. Now Testee sees two images, one at upper side and one at lower side. When asked which image is seen clearest, Testee replies the upper one is clearer, and he can see upper row of the chart by his right eye, and the lower row by his left eye.
  • Page 30 ∆ inclination outward. ○ 21 and set MR b. Then measure vertical phoria. As shown in Fig.48, turn auxiliary lens knob ○ the right eye. Turn rotation prism lens 12 to set the left eye at horizontal position. Now Testee can see red horizontal line with the right eye, and the light spot with the left eye.
  • Page 31 Fig.47 Fig.48 Fig.49 (2) Polarizing Filter Method ○ a. Turn auxiliary lens knob 21 to P and project the polarizing chart (Fig.50). b. Unless the patient has phoria, four lines seen to the patient will be shown as Fig.50. If the patient has phoria, these four lines will not be in alignment.
  • Page 32 ○ c. When the vertical lines are seen disposed as shown in Fig.51-a, turn rotation prism 12 of the ○ left eye with 0 scale upward. Then turn prism rotation knob 11 slowly so that the image is shown as Fig.50 (horizontal phoria). d.
  • Page 33 6.8.8 Presbyopia Test This test is provided to those who are more than 45 years old. a. First, affirm distance of measurement and put it in the examination aperture. Attach near point ○ ○ 31 and near point rod holder 5 to the instrument, then fix them firmly using clamping ○...
  • Page 34 Fig.52 Fig.53 Fig.54 (2) Vertical Phoria ○ 21 to set the left eye at 10∆I so that letter columns are completely Turn auxiliary lens knob separated. If the patient has vertical phoria, it will be shown as Fig.55. Then turn the rotary prism to ○...
  • Page 35 ○ and abduction at near point can be measured when the near point card is fixed to near point rod 31 . The method for other measurements is identical. (2) Vertical Abduction ○ Set rotary prism 12 in front of both eyes, and place 0 setting in horizontal position. Use the horizontal letters in the visual acuity chart for far point (5m) test, and use near point card to conduct ○...

  • Page 36: Maintenance

    +2.25DS/-0.75DC× l65° 7. Maintenance 7.1 Daily Care ○ (1) Use dust cover 33 to protect the instrument from dust when it is not in use. (2) For long-term storage, keep the instrument in a dry place free of dust. (3) When lens becomes dirty, use lens cleaning cloth moistened with a little absolute alcohol to wipe it.

  • Page 37: Cleaning & Protection

    processed. 9. Cleaning & Protection Note: When cleaning, do not wipe with any corrosive detergent to avoid damage to the surface. Note: Do not wipe with hard cloth, hard paper, etc. Otherwise, the detection window glass may be scratched. Note: Wipe gently when cleaning the detection window. Otherwise, excessive force may scratch the detection window.

  • Page 38: Environmental Protection

    11. Environmental Protection In order to protect the environment, please pack the equipment and send it back to our company when the equipment life expires, or dispose of it in accordance with local regulations in force. 12. The responsibility of the manufacturer The company is only responsible for the impact on the safety, reliability and performance of the equipment under the following conditions: - Assembly, addition, adjustment, modification or maintenance are all carried out by personnel...