Manual Refractor R-2600 Luxvision
Contents
1. 1 56 Then scale of rotary prism indicates vertical phoria power 33 Fig 57 4 8 10 Other Measurements 1 Vergence eyeball movement in different direction Set rotary prism 2 in front of both eyes and place 0 setting in uppermost position To measure adduction of eyeball at far point turn the prism outward for both eyes simultaneously When the chart is seen as two images in the vertical direction the point where double vision first occurs the reading at this time indicates adduction power The rotary prism can be used to measure maximum 40 A only about 22 For abduction measurement turn the prism of both eyes inwards simultaneously When the object is seen as a double image record the readings Maximum range of measurement is 40 A If 10 A BI 15 used on auxiliary lens disk maximum test value is 50 Adduction and abduction at near point can be measured when the near point card is fixed to near point rod 8 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 near point test Turn prism rotation knob 1 and when horizontal letters are seen as a double image record the reading which 18 patient s vertical abduction power 34 4 8 11 Transposition of Prescriptions In Comprehensive Optometr2. R 2600 MANUAL REFRACTOR User s Manual e LUXVISION Instruction Thanks for purchasing and using vision tester Before using our instrument please read this manual carefully We sincerely hope that it will provide you with enough information Providing products with more refined quality complete function and characteristics to customers is our target We regret any inconvenience caused by not notifying you the differences of products from those advertised on promotional and packaging materials resulted by product performance enhancement Meanwhile we reserve the right of constantly updating products and materials If there is any problem during use please contact authorized distributor Your satisfaction is the cornerstone of our progress 1 Introduction e reinnoire onani enera aisen 1 1 1 Uses 1 1 5 Characteu stieg Xo nanan Renata SUR AN LN ERN GRAB 1 1 3 Working Environment eHH HH nnns 1 1 5 Main technical indexes rodennad RAM D 2 1 6 Name plate and 3 1 7 Safety Notice 3 2 Configuration memet 5 PAN TI 5 3 Assembly 9 3 1 Attaching Instrument to Ophthalmic Stand 9 3 2 Attaching Near Point Rod Near Point Card and Card Holde 9 3 3 Attaching
3. dismantle it at random 2 Configuration 2 1 Parts 2898 5 69 2 2 amp 2 2 2 2 2 1 Rotation Adjustment Knob Used to adjust direction of instrument s main body 2 Mounting Handle Used to install the instrument onto eye optometry table 3 Clamping Screw Used to fix near point rod 4 Leveling Adjusting Knob Used to adjust level position of the instrument 5 Near Point Rod Holder Used to attach near point testing mark rod to hanger frame 6 Pupil Distance Knob Used to adjust pupil distance 7 Pupil Distance Scale Used to display pupil distance Vergence Lever Used to adjust corner of device s left and right disks 9 Forehead Rest Knob Used to adjust patient s forehead position Corneal Aligning Aperture Used to display position of patient s cornea vertex 1 Prism Rotation Knob Used to adjust prism power 12 Rotary Prism Used to test phoria or binocular balance 3 Examination Aperture Aperture for test with various lenses set here Cylindrical Lens Axis Scale Used to indicate cylindrical lens axis angle 5 Face shield Clip Fix face shield Fixing Hand wheel Used to fix instrument to ophthalmic stand 7 Tightening Screw Used to fix instrument to ophthalmic stand and stored in accessory box Spirit Level Used to indicate level direction Rotation Knob Used to adjust astigmatic axis of cross cylindrical lens Cross Cylindrical Lens Used t
4. 5 2 Checking and Servicing Procedure eee 36 6 Before Requesting Service Troubleshooting Guide 37 7 Optional Accessories Cylinder Lens PTTTTTITITETITITCITITITT Tree 37 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 1 2 Characteristics A Unique design of butterfly shape appearance Capable of checking up all sided visual functions accurate and comfortable in measurement A Exquisite manufacturing technique with comfortable feel High quality plated film used in all optic lenses A Technology and design patents 1 3 Working Environment The instrument should be installed and worked under such environment Temperature 5 40 A Humidity below 85 RH No condensation Environmental pressure 800 1060hPa Clean indoor place ANo direct strong light No vibration and collision 1 5 Main technical indexes 1 5 1 Spherical Lens Range of measurement 19 00D 16 75D Step length 0 25D being 0 12D when 0 12D auxiliary lens is used 1 5 2 Cylindrical Lens Range of measurement 0 6 00D being 0 8 00D when additional lens is used Step 0 25D being 0 12D when additional lens 15 used 1 5 3 Axis of Cylindrical Lens Range of measurement 0 180 Step 5 1 5 4 Cross Cylind
5. 13 75mm which 15 the standard spectacle wearing distance Three shorter lines are provided by 2mm equal distance away from the longer line If apex of the cornea of testee is positioned on second shorter line from the longer line the lens power should be the value measured when spectacle is placed at 17 75mm away from apex of the cornea standard value 13 75mm correction value of second shorter line 4mm 17 75mm If the actual spectacle wearing distance is different from the standard value 13 75mm correction should be made according to Table and Table 2 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 applied correction factor is 0 26D for 16 8 00D diopter and 4mm distance Therefore actual diopter of a patient who wears 13 75 distance standard spectacle is 8 00D 0 26D 8 26D The correction value changes by 0 25 D or 0 12D Example 2 Assume that the apex of cornea is between the second and third shortest lines from the longest line Smm from the standard line the obtained data is S 11 50D It is known when referring the correction factor in Table 2 that for 11 50D and 5mm distance the correction value should be 0 57 0 68 2 0 62D Thus the actual diopter of a patient who w
6. 19 Then tighten tightening screw 17 under mounting handle 2 Tightening screw 17 is stored in standard accessories box 5 b Turn leveling adjusting knob 4 until air bubble is located at middle position of spirit level bubble 9 Loosen rotation adjustment knob 1 to turn the instrument to the required direction Notice o Fastening screw 89 placed R inaccessories box can be v usedto better fasten vision 18 testerwhen itis not matching 1 withthe vision tester holding arm gt E 1 Fig 7 3 2 Attaching Near Point Rod Near Point Card and Card Holde First insert card holder 83 into near point rod 31 and slide it to a proper position Then attach near point card 82 to an open aperture of card holder 83 Fig 8 Afterwards attach near point rod 6 onto near point rod holder 5 and fix clamping screw 3 When near point rod 1 is not used raise it upwards Fig 9 Fig 8 Fig 9 3 3 Attaching face shield Attach face shield G9 so that face shield clip 5 catches it Then align face shield aperture with examination aperture 3 Fig 10 10 4 Operation Procedures 4 1 Spherical Lens To show the spherical power only shortened as S turn auxiliary lens knob to position then turn cylindrical lens knob 27 until 00 is shown on cylindrical power scale 5 Then turn weak spherical power d
7. 1f both lines are seen equally presbyopia spectacles are unnecessary d Add 0 25 to both eyes S simultaneously until horizontal line and vertical line are equally discernible e Change 50 of both eyes to O Turn the near distance card to show small letters Then ask the patient if letters are clear A proper adjustment is required for S value The measurement is complete Record the results 32 4 8 9 Phoria at Near Distance 1 Horizontal Phoria If the patient has no presbyopia set the results of phoria tested at far point in aperture If the patient has presbyopia put the results on the near point test Set the near point card at 40cm and turn auxiliary lens knob to set the right eye at 6 A U so that letter rows are fully separated If the patient has horizontal phoria it will be shown as Fig 52 Turn rotary prism 12 to the other eye with 0 scale upward see Fig 54 Tum prism rotation knob 1 so that there is no difference between the left and right eyes and at this time scale of the rotary prism indicates prism power see fig 53 Fig 54 2 Vertical Phona Turn auxiliary lens knob 21 to set the left eye at 10 A I so that letter columns are completely separated If the patient has vertical phona it will be shown as Fig 55 Then tum the rotary prism to the other eye with scale of 0 horizontal as shown in Fig 57 Turn prism rotation knob 41 so that there is no difference between the upper and the lower see
8. he can see it If Testee says he can see it as shown Fig 30 turn the cylindrical lens axis knob 6 to 90 from the darkest line he has seen see Fig 31 If Testee says all lines are equally bright it 22 means no astigmatism is existent Then procedures 3 and 4 in 4 8 2 and procedure 4 8 2 are not required 4 Turn cylindrical lens knob 07 to change value 00 25 50 so every line is seen equally When it is turned to 0 50 the chart is as shown as Fig 32 5 Change S by 0 25D steps by turning weak spherical power dial 3 so that the visual acuity becomes from 1 2 to 1 5 Record the changed value of the visual acuity Fig 32 Fig 33 For myopia spectacles with least power should be selected and for presbyopia spectacles with largest power should be selected To correct Testee s vision to that of 1 5 his spectacle power may be 1 75 2 00 or 2 25 and then 1 75 should be selected Now examination 15 almost completed however more precise measurement 15 required 4 8 3 Precise Refining Cylinder Axis and Power 1 Set cross cylindrical lens 29 in front of Testee s right eye and turning rotation knob 9 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 rotate cross cylindrical lens 20 Then ask Testee to compare the two images he sees before 23 and after turni
9. 15 Fig 16 The meaning of each mark Open aperture OC Shelter from aperture 50 Cross cylinder lens with horizontal plus axis Used for presbyopia test 6 AU diopter base up prism used for horizontal phoria test 12 12 Q RL RMH RMV P R IOAI GL A Imm diameter pinhole is provided used to determine reason of poor vision due to refractive abnormity or their reasons 0 120 spherical lens and spherical power can be set by 0 12D Cross piece Red color filter lens Red Maddox rod lens set horizontally Red Maddox rod lens set vertically Polaroid filter used for polarizing testing of stereoscopic vision Andbinocular balance of stereoscopic vision Retinoscopic lens 1 50D spherical lens 67cm 10 diopter base prism used for vertical phoria test Green color filter lens WMH White Maddox rod lens set horizontally WMV White Maddox rod lens set vertically Fig 17 To change direction of cross cylinder lens and polaroid filter first remove the retaining ring and rear cover glass using screwdriver Rotate the auxiliary lens knob 1 until auxiliary lens 13 is properly indexed and in alignment with examination aperture 13 By slightly turning the auxiliary lens knob in both directions a screw and washer can be seen above and below the lens Removing these two screws auxiliary lens can be then removed By reversing above procedure reposition of lens 1s possible to en
10. 2 65 26 93 83 11 09 1 39 1 70 2 02 2 35 2 69 3 05 29 60 91 1 24 1 58 1 93 2 30 2 68 3 07 3 48 33 67 1 03 1 40 1 78 2 18 2 59 3 03 3 48 3 95 37 75 1 15 1 56 1 99 2 44 2 91 341 3 92 4 46 41 83 01 28 1 74 2 22 2 73 3 26 3 81 439 5 00 18 Correction Table 1 When Correction Value of Measured Power is in Minus Region 001 002 003 004 005 006 007 008 009 01 004 008 01 02 02 02 03 03 04 04 009 02 03 04 04 05 06 07 0 08 09 02 03 05 06 08 09 11 12 14 1 15 02 05 207 10 12 15 A7 19 22 24 04 07 11 14 17 21 24 27 31 34 05 10 14 19 24 28 33 37 41 46 06 13 19 25 31 42 48 54 1 59 08 16 24 131 39 46 53 60 1 67 74 10 20 29 38 48 97 65 74 83 91 12 224 35 46 57 68 79 89 99 1 09 14 28 42 1 55 68 81 93 1 05 1 17 1 29 17 33 49 64 19 94 1 08 1 22 1 36 1 50 19 38 56 74 92 1 08 1 25 1 41 1 57 1 72 32 44 65 85 1 05 1 24 1 43 1 61 1 78 1 96 25 1 390 73 96 1 19 1 40 1 61 1 82 2 01 221 28 56 82 1 08 1 33 1 57 1 81 2 04 2 26 2 47 32 63 92 1 21 149 1 75 2 01 2 27 2 51 2 75 35 70 1 02 1 34 1 65 1 94 2 23 2 51 2 77 3 03 39 1 1 13 1 48 1 82 2 14 2 46 2 76 3 05 3 33 19 4 7 Near Point Card If the lens is multifocal it is req
11. d When horizontal lines are seen disposed as shown in Fig 51 b adjust 0 scale to horizontal position and then turn prism rotation knob 11 so that the image is as shown in Fig 50 vertical phoria e When both vertical and horizontal lines are disposed to have phoria as shown in Fig 51 c adjust rotary prism 2 to make scale 0 vertical so that the vertical line is in the middle of horizontal line as shown in Fig 51 b horizontal phoria Afterwards adjust scale 0 to be horizontal Turn prism rotation knob 17 so that horizontal lines are 1n the middle of vertical line as shown 12 51 vertical phoria Fig 51 c 3l 4 8 7 Arranging Results Now examination of Testee is completed If the results show Testee has severe phoria the spectacles should be adjusted If not the prescription would be PD 63mm 1 5DS 0 5DC 100 1 75DS 0 5DC 170 4 8 8 Presbyopia Test This test 15 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 rod 87 and near point rod holder 5 to the instrument then fix them firmly using clamping screw 3 b Turn auxiliary lens knob 27 to 50D both eyes c Use near point card 82 as near point examination of the patient Ask the patient how about the vertical line and horizontal line he sees If presbyopia is seen the horizontal line will be seen clearly with vertical line being dull
12. d at P it means diopter power 15 increased by 0 25D thus totally 0 5D 15 added 105 T 5 n P1208 lu ll 13955 te ues zai e 15 Fig 38 Fig 39 8 Turn the lens again to verify the finding If Testee reports that the chart in the setting of Fig 39 15 clearest the correct modified power should be between 0 25D and 0 5D Hence the accurate power should be 0 62D 4 8 4 Precise Refining Spherical Power Red Green Test 1 Use red and green chart to determine precise spherical lens value see Fig 40 Ask the patient which one 15 seen clearest red or green chart If the green one is seen better it indicates myopia 15 increased hyperopia decreased The reduce spherical lens value by 0 25D 1 75 gt 1 50 25 5005 3 4 4 3 2 9 0 oO 2 Fig 40 2 Ask Testee again to affirm which chart is seen clearer the clearer red stands for decreased myopia increased hyperopia Testee s power is 1 62D Generally the weak spherical power dial is used to adjust myopia and strong spherical power dial is used to adjust hyperopia 3 Now right eye examination 15 completed with lens power result as follows Spherical power 1 50 Cylinder power 0 50 and Axis 100 1 50DS 0 50DC 100 Then examine the left eye Turn auxiliary lens knob 07 to set O for left eye and OC for right eye Then use same measuring method to measure left eye Testee s left e
13. e normal 36 6 Before Requesting Service Troubleshooting Guide If any problem occurs first check the following items and follow the suggested instructions When the trouble cannot be eliminated please contact us 1 The required lens cannot be set at examination aperture 15 knob turned to correct position Is any other lens attached to the patient s examination aperture 2 When vergence lever 8 is adjusted does any action of corresponding vergence occur 7 Optional Accessories Cylinder Lens Three types of spare lens are optional 2 00CYL 0 12CYL and 00CYL 37 es 7 2600 _ MANUAL REFRACTOR 7990 NW 14 Street Suite 105 Doral FL 33172 elephone 888 334 4640
14. ears 13 75 distance standard spectacle is 11 50 0 62 10 88D Example 3 When the cornea apex is on the third shortest line from the longest one the obtained value is 14 00D It is known when referring to correction factor in table 2 that for 14 00D and 6mm distance the correction value should be 1 08D So the actual diopter of a patient who wears 13 75 distance standard spectacle is 14 00 1 08 12 92D If more accurate measurement is required please calculate it according to following formula LD 1000 LD D D D Measured power D Corrected power L Difference between measured distance and wearing distance mm 17 Correction Table 1 When Correction Value of Measured Power is in Plus Region 001 002 003 004 005 006 007 008 009 01 004 008 01 02 02 02 0 03 03 04 04 009 02 1 03 04 05 06 06 07 1 08 09 02 03 0 05 07 1 08 10 12 1413 17 03 05 08 10 13 15 18 21 24 26 04 1 07 11 15 1 19 22 26 30 34 38 05 10 0 15 20 23 31 36 42 47 53 06 13 20 26 33 40 47 55 62 10 08 16 25 34 42 51 61 70 79 89 10 20 31 42 33 64 87 01399 1 11 12 25 38 0 51 64 78 92 1 06 1 21 1 36 15 30 AS 61 at 931 10 1 27 145 1 64 17 35 23 71 90 1 10 1 30 1 51 1 72 1 94 20 40 61 83 1 05 1 28 1 52 1 77 2 02 2 28 23 46 71 96 1 22 148 1 76 2 05 2 34
15. es Project polarized binocular balance test chart 21 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 If both rows can be seen with equal clarity it means the balance 1s good When both rows are not seen with equal clarity add 0 25D spherical lens value to one eye with better clarity until both columns are seen with equal clarity Turn auxiliary lens knob 07 to O both eyes Add 1 00D to spherical lens value of both eyes d Gradually reduce spherical lens value by precision of minimum 0 25D until visual acuity for both eyes becomes 1 2 or 1 5 4 8 6 Measuring Phoria at Far Point 1 Maddox rod and rotary prism method a First conduct horizontal phoria measurement Proceed according to 1 rotary prism method described 1 4 8 5 Binocular Balance Test Turn auxiliary lens rotation knob 27 and set right eye to RMH Fig 44 Turn prism rotation knob 17 with its setting 0 on the triangle symbol facing the left eye Light a small fixation light at the position where the chart 15 projected Now Testee s right eye can see a red vertical line see Fig 45 a and his left eye can see a light spot see Fig 45 b They are probably a or b of Fig 46 The light spot will also move when prism rotation knob D is tur
16. face shield Hen 10 4 Operation Procedures mne 11 4 1 Spherical Lens Hn 11 4 2 Cylinder Lens 11 4 3 Auxiliary Lens m Hen 12 4 4 Cross Cylindrical Lens Henn 14 4 5 Rotary Prism nennen nenne nennen 15 4 6 Corneal Aligning Device 16 47 Near Point Card 20 4 8 Examination Procedures BEBE BRR RRR 2 1 4 8 1 Installing Instrument 21 4 8 2 Examination Using Fogging Method 22 4 8 3 Precise Refining Cylinder Axis and Power 23 4 8 4 Precise Refining Spherical Power Red Green Test 25 485 Bi cculat Balance xa EA KR RR ON 26 4 8 6 Measuring Phoria at Far Point ne 28 4 8 7 Arranging Results 32 4 8 8 Presbyopia Test 32 499 Phoraat ees 33 4 8 10 Other Measurements 34 4 8 11 Transposition of Prescriptions 35 5 ea eov 36 5 1 Daily 36
17. ft and right eyes is all 0 7 20 30 Then use a comprehensive optometry meter to precisely measure diopter power of Testee s left and right eyes at present 4 8 1 Installing Instrument 1 Attach the near point rod 87 downwards to near point rod holder 5 Fig 9 2 Set the spherical lens power value S and cylinder lens power value C to zero 3 Before examination first set pupil distance Turn pupil distance knob so that pupil distance of Testee is shown in pupil distance scale 7 21 4 Move instrument so that the instrument s side shown in Fig 4 is facing to Testee Now place forehead of Testee on the forehead rest 09 5 Turn leveling adjusting knob 4 while observing air bubble until the air bubble moves to middle of the water bubble 6 Determine the distance between vertex of cornea and the instrument 7 To measure right eye first turn auxiliary lens knob to set O for right eye and OC for left eye 4 8 2 Examination Using Fogging Method 1 Add 3 00D to the estimated S value for right eye Then power of his spectacle is 1 00D namely 1 00 3 00 2 00D 2 In this condition Testee is unable to clearly see the projected chart Gradually add minus power In example of Testee reduce S value gradually by turning weak spherical power dial 23 2 00 1 75 71 5 0 5 until it shows 1 00 D Fig 30 12 31 3 Project astigmatic chart while asking Testee if
18. ial 3 value S is displayed in spherical power scale 09 within range from 19 00D 16 75D increasing or decreasing progressively in 0 25D Fig 11 To obtain required diopter setting quickly use strong spherical power knob 02 then value S increases or decreases progressively in 3 00D diopter steps Fig 12 Note Although several figures will appear on the scale only three or four digit numbers have meaning For example if 075 is shown it should be read as 0 75D and if 1150 1s shown it should be read as 11 500 4 2 Cylinder Lens By turning cylindrical lens knob Q7 the cylindrical power is shown on cylindrical power scale 05 with range from 0 00D to 6 00D and increases or decreases progressively in 0 25D steps Fig 13 By turning cylinder lens axis knob 09 the axis angle of 11 cylinder lens is shown on cylinder lens axis scale 68 with range of 0 180 step 5 Fig 14 Fig 13 Fig 14 4 3 Auxiliary Lens Turn auxiliary lens knob 27 the required symbol is to be set at 12 o clock position Then Corresponding referenced lens will appear in the examination aperture 3 Fig 15 and Fig 16 Lm CAO et my EN x os E V i I S um f 1 u nl hn H M Sw 1 c 5 Ff ks EN X WE X X ui a TE 4 E Er yx E h Fig
19. ned Then ask the patient to tell when he sees the image 28 shown in Fig 46 b The test result is shown in Fig 47 The prism rotation scale is shown as 2 The result of 2ABI base inward stands for 2 A inclination outward b Then measure vertical phoria As shown in Fig 48 turn auxiliary lens knob 27 and set RMV for the right eye Turn rotation prism lens 2 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 Then using same procedure of a ask Testee when he can see red line and light spot meet while turning prism lens rotation knob 1 When it is shown as Fig 49 Testee reports they meet it is 0 5 below 0 indicating left eye is 0 5ABD called 0 5A upward heterophoria 29 Fig 44 Luminous red line Fig 45 Fig 46 30 2 Polarizing Filter Method a Turn auxiliary lens knob 1 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 Fig 50 Fig 51 a Fig 51 b c When the vertical lines are seen disposed as shown in Fig 51 a turn rotation prism 2 of the left eye with 0 scale upward Then turn prism rotation knob 1 slowly so that the image is shown as Fig 50 horizontal phoria
20. ng cross cylindrical lens Stop at better side For example if what Testee sees is clearest as shown in Fig 35 of cross cylindrical lens turn cylindrical lens axis knob 06 to move axis of cross cylindrical lens by 5 in direction of red dot so that position of cylindrical lens axis scale 28 is positioned at 95 F T Fig 34 3 Turn the lens again to make a comparison If what Testee sees is the most clearest as shown in Fig 37 move cross cylindrical lens axially towards red dot by 5 enabling it to become 100 4 Turn the lens again If Testee cannot report any difference precise examining cylinder axis is completed with astigmatic axis of 100 5 Now to conduct precise measurement of cylinder power and turn letter P to original axis see 12 37 La y ws zz 24 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 1 means Testee s diopter has increased by 0 25D now Testee s diopter power 15 0 750 7 Turn the lens again to make a comparison If the chart as shown in Fig 39 1s the clearest the diopter power should be decreased by 0 25D because white dot is positioned at P If the red dot is positione
21. o precisely check astigmatic power and axis 07 Auxiliary Lens Knob Used for various visual acuity tests 22 Strong Spherical Power Knob Used to adjust big spherical lens power step 3 00D 23 Weak Spherical Power Dial Used to adjust small spherical lens power step 0 25D Spherical Power Scale Used to display spherical lens power 25 Cylindrical Power Scale Used to display cylindrical lens power Cylindrical Lens Axis Knob Used to adjust cylindrical lens axis 67 Cylindrical Lens Knob Used to set cylindrical lens to examination aperture Cylindrical Lens Axis Scale Used to display angle of cylindrical lens axis 09 Forehead Rest Gi 82 63 Patient s forehead rests here Instruction Manual Near Point Rod Card holder is attached on this rod Near Point Card Including near point sight mark Card Holder Used to attach near point card Dust Cover Use dust cover to protect instrument from dust Accessories Box Used to store the standard accessories Face shield Left and right face shields one each are installed on position where instrument and patient s nose contact Balloon with Brush Used to clean lens Additional Lens Used to change testing range and precision Fig 5 Fig 6 3 Assembly 3 1 Attaching Instrument to Ophthalmic Stand a When assembly is conducted first insert the mounting rod extending from the ophthalmic stand to hole of mounting handle 2 and fix it with fixing hand wheel
22. rical Lens 0 25D 1 5 5 Rotary Prism Range of measurement 0 20 A Step 1 5 6 Prism basal angle Range of measurement 0 180 Step 5 1 5 7 Pupil Distance Range 5 0mm 70mm Step Imm 1 5 8 Aggregated Adjustment oo 380mm when PD 64mm 1 5 9 Adjustment of Forehead Rest 16mm 1 5 10 Vertex Distance 13 75mm 1 5 11 Overall Dimensions 335mm L x320mm W x90mm H 1 5 12 Weight 4 5 kg instrument only 1 6 Name plate 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 1 7 Safety Notice When taking the vision tester one should hold mounting Fig 1 Fig 2 handle Fig 1 at upper part of the instrument or carry left and right ends of the instrument by both hands Fig 2 Do not set the instrument with face down or exert pressure onto surface of lens and do not toucb lens by band AThe instrument shall not be put in damp and dusty room moving parts be turned in dual direction However care must be taken to do it and do not turn it beyond the limit position so as to avoid damage to the device A The plastic part Forehead Rest and spirit level etc that can be scrubbed shall be swabbed down using cotton cloth and do not use cleaning liquid or other chemicals A Vision tester belongs to precision instrument so do
23. sure it is placed in a proper position Fig 17 4 4 Cross Cylindrical Lens It is used for precise determination of cylinder power and axis Turn cross cylindrical lens to the front of examination aperture The letter P at front sustenance face stands for the power and hand wheel direction stands for axis When red dot aligns with P it indicates minus 0 25D cylindrical lens When white dot aligns with P it indicates plus 25D cylindrical lens er Nm 4 5 Rotary Prism 12 21 12 22 Turn rotary prism 2 by holding its base to set it on examination aperture Turn prism rotation knob 17 until the required prism power 15 set What the black triangle arrow indicates 1s the current prism power For example prism power indicated in Fig 22 is 0 that in Fig 23 means base in 3 A prism power and that in Fig 24 means base up 3 A prism power 15 4 6 Corneal Aligning Device woo Graduation Kes eye scale Fig 25 Turn forehead rest knob 9 to adjust position of forehead rest 09 After setting patient s forehead closely on forehead rest 09 look through the corneal aligning aperture 10 from around 20cm away Look at the apex of the patient s cornea Fig 25 after the examination aperture s pointer acme of corneal aligning aperture 0 aligns with the longer line on the scale The longer line in the aperture means the measuring distance is
24. uired to measure lens diopter at near distance Then near point rod 87 card holder 33 and near point 82 can be used Lower near point rod 81 keeping rod horizontal is the correct setting for measurement Fig 27 Near point distance from 15cm to 70cm i e about 6 inches to 28 inches and lens diopter from 8D to 1 5D are provided The value indicated at tail of card holder 83 is just the value to the card from apex of the cornea Fig 28 Select the required sight mark on the near point card Turn the rotating portion along the card center by the finger until the required value appears in the sight window Fig 27 Fig 28 Then turn vergence lever 8 inward to move the instrument so that main axis of lens faces to 380mm Now near point testing can be carried out Fig 29 20 4 8 Examination Procedures Following is an example of examination Before examination patient s visual acuity should be determined Example Testee 35 years old who wears spectacles First use lensmeter to measure the spectacles he is wearing with following results PD 63mm 1 00DS 0 50DC 902 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 spherical power of his left eye is 1 25D with astigmatic power of 0 50D and axis 180 With these spectacles worn in examination visual acuity of Testee s le
25. y Device myopia astigmatic method is used to carry out fogging measurement However when hyperopia astigmatism is required sometimes please use correction results in following formula XDS YDC AZ X Y DS Y DC Z 90 5 Add the cylinder lens power to the spherical lens power C Convert the index of cylinder lens power A Add 90 when Z is less than 90 and deduct 90 when Z is larger than 90 Example 1 For 4 00DS 1 50DC x155 changed to S 4 00 1 50 2 50 1 50 1 50 A 155 90 65 So the result is 2 50DS 1 50DCx65 Example 2 For 1 5DS 0 75DCx75 S 1 5 0 75 2 25 0 75 0 75 A 75 90 165 So the result 1s 2 25DS 0 75DCx165 35 5 Maintenance 5 1 Daily Care 1 Use dust cover G2 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 4 Before operation Clean Forehead Rest 09 and nosepiece with medical cotton watted with absolute alcohol 5 2 Checking and Servicing Procedure In normal use no special checking or servicing is necessary However when it is used at extremely low temperature the turning knobs or dials will become heavier than usual because of lubricant used inside instead of any mechanical reason When temperatures return to normal all will b
26. ye is measured as L 2 00DS 0 50DC 170 4 8 5 Binocular Balance Test 1 Rotary Prism Method a Tests are performed for left and right eyes independently in which binocular prism shall be used for both eyes On the whole these tests are referred to as the binocular balance test Set both eyes to O Use the chart shown in Fig 34 and set prisms as 2 A BU right eye and 2 A BD left eye see Fig 41 26 Fig 41 b Now Testee sees two images of chart one at upper side and one at lower side When asked which image 15 seen clearest Testee replies the upper one is clearest Then add 0 25D to spherical lens value of right eye When the image at lower side is seen clearest add 0 25D to spherical lens value of left eye namely 2 00 0 25 1 75D c Ask Testee again to affirm which one is clearest When both become similar it means balance test 1s completed d Remove the rotary prism Add spherical lens power of 1 00D to both eyes So Testee s visual acuity should be 0 5005 0 50DC A 100 L 0 75DS 0 50DC 170 Now add minimum power of 0 25D to binocular spherical lens value Gradually change the spherical lens value until he can see 1 2 or 1 5 20 15 visual mark clearly He desires to see 1 5 20 15 clearly then change spherical lens value as follows 1 50DS 0 50DC 1002 L 1 75DS 0 50DC A170 2 Polarizing filter method a Turn auxiliary lens knob 27 to P both ey
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