User Manual
Contents
1. Content CC AO ATOS aa ne ie 4 Working PIAS NS DOVO E a ne a ce tn 4 Scere as gs eee er ne eee ere ere ee en ee 5 Bee a EEA E E E E EE E A E E TE E E E E 16 MAON OO eer E E tite 21 Common roulo SNOGUNG premarin em nn een teen ewer ernest me rene eer rere 23 TC UNC O a a nt nie 24 1 Function Introduction This lensmeter is divided into 2 models standard model and strengthened model with prism compensator This product is applicable to measurement testing departments spectacles manufacturers retail dealers of spectacles hospital s department of ophthalmology and optical element factories for conducting measurement of spherical lens diopter cylindrical lens diopter cylindrical lens axis of astigmatism prism diopter prism basal angle and cornea contact lens diopter In the following description all chapters or content attached with in the front are special for strengthened model device with prism compensator 2 Working Principle Device Fig 1 Diagram of Optical Principle of Device 1 Light source 2 Color filter piece 3 Mark dividing plate 4 Measuring object lens 5 Diaphragm 6 Telescope objective lens 7 Half 5 edge prism 8 Eyepiece dividing plate 9 Eyepiece set 10 Reading dividing plate 11 Zero line dividing plate 12 Reflector 13 Front lens 14 Corner cube prism 15 Rear lens 16 Prism compensator This device consists of a coaxial optical system The light emitted from light source 1 illuminating lam2. 2 3 1 1 Top cover Fig 3 It is an arch shape cover plate that can be dismantled which offers a window for professional personnel to maintain the device Top cover Fig 3 Important Matters For non professional personnel please do not open the top cover by yourself and do not move internal parts either Warning When moving the device it is strictly forbidden to hold the top cover so as to avoid damage to the device Fig 4 Correct way of moving the device Support the body of device with one hand and hold its bottom with other hand 3 1 2 Eyepiece system Fig 5 The eyepiece system is a screw type focusing unit with focusing range of 5D which can be adapted to different eyesight of human Eyepiece lens Scale of eyepiece focusing range Fig 5 3 1 3 Lens pressing mechanism Fig 6 In this mechanism 3 plastic pressing feet with spring are used to press lens where lens with any shape of surface can be firmly pressed without damage to lens surface In use lift the lens pressing handle so that the lens pressing mechanism is lowered to press the lens After use lift the lens pressing handle to hang up the lens pressing mechanism Lens pressing handle Lens pressing feet 3 pieces Fig 6 3 1 4 Measurement bearing seat see Fig 7 It is a white nylon part that is able to firmly support lens with any shape of surface without damage to lens surface Below it there is measuring eyepiece with 3
3. ink shall be added Matters Needing Attention Adding ink Turn over backwards the device on the working table Dip in ink with brush pen and smear it on ink box so that the ink box is just wet Do not add too much ink to avoid overflow of ink to dirty the device Ink may be also applied directly to points of 3 point making pens After above stated procedure is finished you may conduct testing of lens 4 2 Measurement of Lens Diameter 4 2 1 Put the lens to be measured on the measurement bearing seat with concave facing downwards 4 2 2 Release lens pressing mechanism so that the lens to be measured can be pressed by feet of lens pressuring mechanism 4 2 3 Turn diopter measuring hand wheel and observe through the eyepiece so that the green lines and round points on the mark dividing plate are clearest Then move the measured lens so that the green line center of mark dividing plate coincides with the black line center of eyepiece dividing plate At this time the view field observed through eyepiece shall be shown as Fig 15 4 2 4 Turn downwards the lens pushing handle so that the lens pushing plate just contacts the edge of lens to be measured At this time the reading indicated 17 by lens pushing measuring scale is just the lens diameter Matters Needing Attention This device is only able to directly measure spherical diameter and sphero cylindrical diameter and unable to measure diameter of lens with prism 4 3 Measurement of
4. instruction supposes that spherical diopter is expressed as low magnitude Measuring procedure is shown as follows 1 Measurement of spherical diopter clear focusing of spherical marking line Pay attention please At this time 2 clear images are attainable Turn diopter measurement hand wheel while turning astigmatism axis measuring hand wheel to have a clearest spherical marking line and record a diopter numerical value Then turn astigmatism axis measuring hand wheel by 90 and again focus a clear spherical marking line and record a diopter numerical value Now compare these 2 reading values taking one with smaller absolute value i e low magnitude as spherical diopter of this lens 2 After soherical diopier is fixed turn diopier measurement hand wheel again to focus a clear cylindrical marking line Record the diopier numerical value at this time high magnitude 20 3 Difference of these 2 leadings is the astigmatism degree of this lens and its axis angle can be read directly from astigmatism axis measurement hand wheel Example Measurement of 1DS 3 5 DC X 30 1 Turn diopter measurement hand wheel while turning astigmatism axis measurement hand wheel simultaneously so that clear spherical marking line is focused At this time the measured data are diopier 1D axis angle 30 Then turn again the astigmatism axis measurement hand wheel by 90 to focus again the clear spherical marking line Data measured at
5. lock screws beside it When the device is not used it shall be covered with a dust cap made of black rubber to protect measuring eyepiece from dirtying see Fig 8 When using device for measurement take off the dust cap Measurement bearing seat Lock screw 3 pieces Fig 7 Dust cap Fig 8 3 1 5 Astigmatism axis measuring hand wheel see Fig 9 It is used to measure and locate astigmaism axis angle of cylindrical lens and basal angle of prism Its scale is identical to graduated disc of eyepiece dividing plate whose scale range is O 180 and scale spacing 5 3 1 6 Pointer of astigmatism axis Scale of measurement astigmatism axis angle Hand wheel of measurement astigmatism axis measurement Fig 9 Printing mechanism see Fig 10 This mechanism consists of a point making pen supporter a point making handle 3 similar point making pens connected in a line and an inkpad box Here the pen in the middle is used to mark lens center the connected point line printed by 3 pens is used to calibrate astigmatism axis angle of lens and basal angle of prism lens and inkpad box is used to store printing ink When printing is required turn the point making handle then ink is easily and quickly printed on the lens Point making handle Point making pen 3 pieces Point making pen supporter Inkoad box 3 1 7 Lens pushing mechanism see Fig 11 andFig 12 This mechanism consists of lens pushi
6. purpose LUXVISION Inc shall not be liable for any errors or for incidental or consequential damages in connection with the furnishing performance or use of this manual or the examples herein The information in this document is subject to change without notice 9990 NW 14 Street Suite 105 Doral FL 33172 Telephone 888 334 4640 25
7. this time are diopter 2 5D axis angle 120 Take 1D as spherical diopter Turn diopter measurement hand wheel while turning astigmatism axis measurement hand wheel simultaneously to have clearest spherical marking line at 1D It is the first time reading Turn the diopier measurement hand wheel again so that a clear cylindrical marking line is focused Now diopter is 2 5D which is the second time reading 2 5D 1D 3 5D namely astigmatism degree is 3 5D Astigmatism axis angle of this lens is read directly from astigmatism axis measurement hand wheel whose value is 30 as shown in Figs 21 22 and 23 Important Matters 1DS 3 5 DC X 30 can be converted into 2 5DS 3 5 DC X 120 It can be also measured using this device which will not be described here again 4 5 Measurement of optical center of 2 assembled lens 5 1 Put spectacles on the device First choose anyone of lens turn diopter measurement hand wheel so that clearest focusing is obtained and green lines are located in the optical axis center Make a central printing mark on this lens by the use of printer Repeat the operation and make central printing mark on the other lens Now simply measure distance between central printing marks of these 2 lens with vernier caliper Maintenance The device has been precisely adjusted before delivery from manufacturing plant Please do not dismantle it at random so as not to influence
8. Spherical Lens Diopter 4 3 1 Put the lens to be measured on the measurement bearing seat with concave facing downwards sec Fig 6 The lower side of lens i e two spectacle rings to be measured mounted on the spectacles frame shall lean against lens pushing plate 4 3 2 Release lens pressing mechanism so that the lens to be measured can be pressed by feet of lens pressuring mechanism 4 3 3 Turn diopter measuring hand wheel and observe through the eyepiece so that the green lines and round points on the mark dividing plate are clearest see fig 15 As this time reading indicated by zero line of reading window is just the spherical diopier of the lens 4 4 Measurement of Sphero Cylindrical Lens Sphero cylindrical lens means astigmatism lens whose exiternal surface is usually spherical and internal surface is cylindrical or convex i e internal astigmatism The refractive power on each section of its internal surface is different in which there are weakest and strongest refractive powers on 2 mutually vertical sections Matters Needing Attention When measuring this kind of lens with this device the spherical marking lines of mark dividing plate i e 2 long green lines unit cylindrical marking lines i e 3 long green lines cannot be dear simultaneously Accordingly measurement should be carried out in separate step Measurement is carried out as follows Repeat Operation procedures 5 3 1 and 5 3 2 of 5 8 Measurement of Spheric
9. al Lens Diopter Then operate it in accordance with following procedure 3 Turn diopter measurement hand wheel so that the ring of mark dividing plate composed of 12 small green points is imaged as clear ring shape short cylindrical lines See Fig 21 18 4 Turn astigmatism axis measuring hand wheel again so that the spherical marking line 2 long lines are in the same direction of short ring lines In the meantime fine adjustment of diopter measuring hand wheel is conducted to achieve the clearest spherical marking line Sec Fig 22 At this time record a diopter Numerical value Fig 21 Mi 5 e a be NT MNT ma Fig 22 5 Turn diopier measuring hand wheel again so that the cylindrical marking line 3 long lines are the clearest and in the same direction of short ring lines see Fig 23 At this time record a diopter numerical value again 19 i i fe far amp he l im ha i p i E i Fig 23 6 The difference value of these 2 measurements is just the astigmatism degree of the lens Matters Needing Attention Diopter of sohero cylindrical lens may be written in many ways Its spherical diopter may be expressed as low magnitude or high magnitude and cylindrical diopter may be expressed as positive number or negative number which can be realized simply by conversion of magnitude Important Matters This operation
10. ale range is 15A O 15A Basal angle graduation Lens pushing pointer Reading pointer Prism degree graduation 11 3 2 Viewed from Eyepiece Set see Fig 15 When viewing through eyepiece set to inside of device one can see eyepiece dividing plate image of mark dividing plate and reading window Eyepiece dividing plate Image of mark dividing plate Reading window Fig 15 Illustration of eyepiece dividing plate image of mark dividing plate and reading window is shown as follows 12 3 2 1 Eyepiece dividing plate see Fig 16 Prism degree measuring scale and graduated disc are marked on the eyepiece dividing plate Integer prism degree can be read directly from the measuring scale and decimal fraction prism degree is reed by estimation of measuring scale Scale range of graduated disc is O 180 with scale spacing of 1 Graduated disc Prism degree measuring scale Fig 16 13 3 2 2 Image of mark dividing plate see Fig 15 Image of mark dividing plate is composed of 3 horizontal long green lines cylindrical marking lines 2 vertical long green lines spherical marking lines 9 small round points in the center and a ring consisting of 12 small round points 9 small round Spherical points marking line Cylindrical marking line Ring consisting of 12 small round points Fig 17 3 2 3 Viewed from Bottom Fig 18 In the view field of eyepiece set reading wind
11. eee M 240 Manual Lensmeter User s Manual LUXVISION Notification Dear Users Thank you for your purchase of LM 240 Lensmeter Please take time to read our user s manual carefully before use This guarantees you to make full use of this unit and prolongs the operation life of this unit Precautions If you have detected abnormal heat smoke noise or smell immediately stop using the product In the event of an abnormality turn off the power and disconnect the power plug from the power socket Continuing to use the product may result in electric shock or fire Observe the instructions given below regarding the power cable Be sure to use the supplied or specified power cable Do not modify forcibly bend kink or pull the power cable e When disconnecting the power cable from the AC outlet be sure to hold the cable by the plug Pulling the cable may cause wire breakage or shot circuit resulting in fire or electric shock e Do not connect or disconnect the plug of the power cable to from the AC outlet using wet hands Doing so may result in electric shock e Do not touch the product with wet hands while the power cable is connected to the AC outlet Doing so may result in electric shock e f the product will not be used for a long period disconnect the power cable from the power source Leaving the cable connected to the power socket for a prolonged period will consume electricity and may result in heating
12. ng handle lens pushing plate lens pushing pointer and lens pushing measuring scale scale range of measuring scale is 26 cm 84 cm it is used to position lens and measure diameter of lens When using it turn downward the lens pushing handle then the lens pushing plate is pushed out forward After use turn upward the lens pushing handle then the lens pushing plate draws back When measurement is needed first press lens with lens pressing mechanism then lightly move lens so as to align the center of the lens and fix it by lens pushing mechanism Now tt is possible to read size of the measured lens and conduct other measurement handle Lens pushing plate Lens pushing pointer Lens pushino measuring scale Fig 12 10 3 1 8 Diopter measuring hand wheel see Fig 13 With one on the left and one on the right of device they can be turned comfortably and smoothly When measurement is needed turn anyone of the hand wheels to achieve a clear focusing then it is possible to read diopter value of lens through reading window Diopter measuring hand wheel 3 1 9 Mains switch Please refer to Fig 2 3 1 10 Prism compensator see Fig 14 When prism diopter to be measured is higher than 5A use of prism compensator is necessary There are 2 lines of scale on the prism compensator the upper line denotes angle whose scale range is 0 180 with minimum scale value of 5 the lower line is prism diopter whose sc
13. nt that the measuring person feels comfortable 4 1 2 Switch on power 4 1 3 Adjustment of eyepiece vision To achieve an accurate and reliable measurement result adjustment of eyepiece vision shall be conducted before measurement The method Observe black digit on the eyepiece dividing plate in the eyepiece view field while turning the eyepiece cap until the black digit becomes the clearest Matters Needing Attention lt is advisable to turn eyepiece cap in one way direction because it can eliminate influence brought about by the effect of eye adjustment 16 4 1 4 Zero position adjustment of device A Turn diopter measurement hand wheel to adjust graduated value in reading window to zero position At this time the green line on the mark dividing plate in the eyepiece view field is the clearest B Turn astigmatism axis measuring hand wheel to adjust graduated value to zero position At this time the long green lines on the mark dividing plate in the eyepiece view field are in the horizontal and vertical directions of view field respectively C Turn prism compensator measuring hand wheel to adjust graduated value to zero position At this lime the green line and round points on the mark dividing plate in eyepiece view field are in the central position of the view field After above staled procedure is completed the view field observed through eyepiece shall be shown as Fig 15 4 1 5 Check if printing mechanism has ink If no
14. ow is located at lower part of eyepiece dividing plate Scale range of reading dividing plate is 25D At 0 5D scale spacing is 0 125D At 5D 25D scale spacing is 0 25D Reading dividing plate Zero line Fig 18 14 3 3 3 3 1 3 3 2 Viewed from Bottom Fig 19 Bottom structure It consists of a cover plate with 9 heat elimination holes and 4 rubber feet where the rubber feet are connected to base seat with M4 hexagonal round head screws Heat elimination hole Rubber feet 4 pieces Fig 19 Replacement of lamp Fig 19 and Fig 20 Procedure of replacing lamp is shown as follows A Pull out power source plug keep it cool for 10 to 15 minutes to avoid scald B Lay down backwards the device so that it is smoothly placed on working table C Loosen 4 screws with hexagonal wrench take off the rubber feet and then take out the cover plate D Take off the old lamp and put on the new one E Put on the cover plate and rubber feet and tighten 4 screws 15 Lamp Lamp seat Wiring terminal Fig 20 Important Matters Please replace it with a new lamp whose model is similar to the original one so as to prevent center of light source from deviating from optical axis of device that has an effect on normal measurement of device 4 Operation 4 1 Preparation Before Measurement 4 1 1 Take off dust cap and put device on working table the working teble shall have a proper height to the exte
15. p passes through color filter piece 2 and lights up mark dividing plate 3 Then mark dividing plate 3 through measuring object lens 4 and telescope 4 objective 6 and after turning direction through half 5 edge prism 7 is imaged at eyepiece dividing plate 8 At the same time the lighted reading dividing plate 10 and zero line dividing plate 11 through front lens 13 and rear lens 15 are also imaged at eyepiece dividing plate 8 Then through eyepiece set 9 it is possible for human eyes to observe clear images of mark dividing plate 3 eyepiece dividing plate 8 reading dividing plate 10 and zero line dividing plate 11 In operation place the spectacle lens at diaphragm 5 measurement bearing seat Turn diopter measuring hand wheel and astigmatism axis measuring hand wheel to have a clear image of mark dividing plate 3 Now the scale value on the reading dividing plate 10 linked with mark dividing plate 3 is just the diopter reading of the said lens 3 Name of Parts First please take a little time to have a look at picture and illustration on following 11 pages and get familiar with your device 3 1 Viewed from front side 1 Top cover 2 a 10 Prism compensator Eyepiece system 6 Printing mechanism 3 Lens pressing mechanism 7 Lens pushing 4 Measurement mechanism bearing seat Astigmatism axis 8 Diopter measuring hand wheel measuring hand wheel 9 Mains switch Fig
16. precision of indication value 21 5 2 5 3 5 4 9 9 The device shall be used in a dry and well ventilated indoor place to prevent the optical parts from becoming mildewed after being affected with damp After using the device cleaning shall be well done and it shall be covered with lens dust cap and outer case Strong shaking or impact shall be avoided to preventing parts from damage and looseness so as not to influence precision of measurement Keep the device clean and touching surface of optical parts with hand is strictly forbidden If dust and stains occur absorbent cotton dipped with mixture liquid of ethanol and ether shall be used to clean it 22 6 Common Trouble Shooting It is not electrified Make it electrified Lamp is not lighted Lamp is out of order Replace lamp Eyepiece dividing Person who receives Put on spectacles plate cannot be testing has too deep seen dearly when myopia degree or has eyepiece visual astigmatism degree is adjusted image can not be seen Dust cap is not Take off the dust cap taken off Green marking Dust exists on optical lens Clean it with absorbent image can not be cotton dipped with seen clearly Cleaning liquid Deviation of the Lock screw Is loosened Take off eyepiece center of green protection cap adjust 3 mark image screws and lock them Limit screw is loosened Adjust Limit screw Displacement of and lock it printing mechanism Connecting screw is Adjus
17. t connecting loosened screw and lock it 23 Specifications Range of diopter measurement Minimum scale value Cylindrical lens axis of astigmatism Minimum scale value Prism diopter Standard model Minimum scale value Strengthened model Minimum scale value Prism basal angle Minimum scale value Adjustable range of eyepiece Measured size of lens Overall dimensions of device Weight Standard model Strengthened model Illuminating lamp O 25 D At O 5 D it is 0 125D At 5D 25 D it is 0 25D O 180 4 O 5A 1A O 20A 1A O 180 4 5D 616mm 80mm 226 mm L X 150 mm W X 390 mm H 4 2kg 4 3kg 220V 110V 15W 24 mms M 240 Manual Lensmeter LUXVISION is not responsible or liable for indirect special or consequential damages arising out of or in connection with the use or performance of the product or damages with respect to any economic loss loss of property loss of revenues or profits loss of enjoyment or use costs of removal or installation or other consequential damages of whatsoever nature Some states do not allow the exclusion or limitation of incidental or consequential damages Accordingly the above limitation may not apply to you Every effort has been made to ensure the accuracy of this manual However LUXVISION makes no warranties with respect to the documentation and disclaims any implied warranties of merchantability and fitness for a particular
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