User Manual
Contents
1. 4 5 Placement of Lens Lens should be placed on the objective lens bearing seal with concave facing downwards The upper edge of lens assembled on the lens frame i e beam edge of lens frame should be leaned against the lens pushing borad Lightly release the lens pressing unit so that the pressing feet press the lens slightly Regulation of lens center Observe it through eyepiece and rotale diopter measuring handwheel to make green dividing line of marker reticule 3 clearest At the same time move the lens so that the green dividing line of marker reticule 3 and center of black cross dividing line of eyepiece reticule 8 coincide Measurement of Spherical Lens Rotate diopter measuring handwheel so that green dividing line of marker reticule 3 becomes clearest Then scale interval on the reading window is the spherical diopter of the iaid lens Measurement of Sphero Cylindrical Lens Sphero Cylindrical Lens means astigmatic lens Normally its outer surface is spherical and inner surface is cylindrical or drum typed e i internal astigmatism Each section of the internal surface has different refractive power in which 2 mutually vertical sections have weakest refractive power and strongest refractive power When this instrument is used to measure such kind of lens 2 long green lines and 3 long green lines of marker reticule 3 will not get clear simultaneously Measurement is made in 3 steps The first step Rotate diopier measuring han2. Operation 4 1 Preparation before Measurement 4 1 1 Place the instrument on the working table and adjust inclination of the instrument so that user is able to make a measurement comfortably 4 1 2 Connect with the mains 4 1 3 Regulation of eyepiece s visibility Before measurement visibility of eyepiece shall be regulated in order to get accurate and reliable results of measurements Method While observing black cross dividing line of eyepiece reticule 8 in the view field of eyepiece rotate eyepiece cover in one way one way rotation can remove influence due to regulation effect of eyes until the black cross line gets clearest 4 1 4 Regulation of zero position of instrument Rotate diopter measuring hand wheel to regulate scale interval to zero position and observe green dividing line of marker reticule 3 in the view field of eyepiece At this time the green dividing line is clearest 4 2 Points for Attention in Operation 4 2 1 A measurand person who has relatively deep diopter or astigmatism of eyes shall wear glasses to correct defects of vision Only after that can measurement be carried out 4 2 2 Among the green dividing lines 2 longer ones are spherical marking lines and 3 longer ones are cylindrical marking lines 4 2 3 To achieve the most accurate measuring results it would be best if one rotate the diopter measuring handwheel in one way The direction of rotation is 25D 25D 11 4 3 4 3 1 4 3 2 4 3 3 4 4
3. Content PPP aa ne ie 4 Working PR NS A e A e o CE oO PE O e paaesomenee 4 A A e EA E o ere eer ter er ree 5 FOS UI ae A agua ude 11 eli o e mA A 16 Common rouble SAQUE eta 17 PE Sn A E 18 1 Function Introduction This lens meter 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 1 Light source 2 Color filter 3 Marker reticule 4 Measuring object lens 5 Diaphragm 6 Prism compensation device 7 Objective lens 8 Eyepiece reticule 9 Eyepiece 10 Reading division board 11 Reflect lens 12 Front lens 13 Right angle prism 14 Black lens This instrument consists of two coaxial optical systems Light sent out from light source 1 ligting bulb passes through color filter 2 to lighten marker reticule 3 Through measuring objective lens 4 and objective lens 7 marker reticule 3 forms its image in eyepiece 8 Meanw
4. damage and looseness of parts and components and guarantee the measuring precision When you change the bulb do not do it until the bulb is cool to avoid burning your hand Always keep the instrument clean Touching surface of optical parts is strictly prohibited Dust and stain on it shall be cleaned with absorbent cotton dipped with mixture solution of ethanol and ether 16 6 Common Trouble Shooting Bulb can not be Mains are not connected Connect with mains lighted Bulb is out of order Change the bulb Degree of the measurand Wear glasses person s myopic eye is too deep or he she has Eyepiece reticule can not be seen when adjusting the eyepiece readings astigrmatism Green marking image can not be seen Bulb can not be lighted Dust shield is not taken off Take off the dust shield Green marking image can nol be seen clearly Deviation of the center of green marking image Translocation of printing unit Dust occurs on optical lens Loosening of lock screw Clean it using absor bent cotton dipped with cleaning solution Take off objective lens protection shield and regulate 3 screws and lock them Loosening of limit screw Regulate limit screw and lock it Loosening of connecting Regulate connecting SCrews screws and lock them 17 Specifications Ranges of diopter measurement Minimum scale value Astigmatism axis of cylindric lens Minimum scale value Pri
5. 0 25D Fig 5 Prism compensation device Fig 6 MODEL LM 200 P The prism compensation device is needed when measuring lens diopter above 5 A There are two lines of graduations on the prism compensation device The upper line is angle between 0 and 180 at 5 intervals The lower line is the prism diopter in the range of 15 O 15A at 1A interval 3 5 Lens pressing unit Fig 7 In the unit 3 plastic pressing feet with springs are used to press lens so that surface of lens with any shape can be pressed stably and no lens surface will be bruised When it is operated lift the lens pressing bracket so that the lens pressing unit lowers to press the lens After using raise the lens pressing unit and then the lens pressing unit is hung 3 6 Lens pushing unit Fig 8 The unit is used to fix the position of lens During operation turn backwards the lens pushing handle and then the lens pushing board is pushed out forwardly After use turn forwards the lens pushing handle to withdraw the lens pushing board During measurement first press the lens with the lens pressing unit and slightly move the lens so that it aims right at center then fix it with the lens pushing unit 3 7 Printing unit Fig 9 The unit has 3 identical point making pens connected in line the pen in the middle is used to set center of lens and the connected line of printing points made by these 3 pens are used to demarcate angle of axis of astigm
6. A M 200 Manual Lensmeter User s Manual G LUXVISION Notification Dear Users Thank you for your purchase of LM 200 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 If 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
7. atism and base angle of prism lens When printing is needed turn holder of point making pens and apply ink to the front ends a small convex of 3 pens then it is very convenient for people to print the ink on the lens swiftly Fig 9 3 8 Objective lens bearing seat Fig 10 It is a white nylon part which is able to stably support surface of any shape of lens without bruising lens surface Objective lens is shown below and there are 3 lock screws nearby Fig 10 3 9 Diopter measuring handwheel Fig 11 There is a diopter measuring handwheel at either side of this instrument They can be rotated smoothly and steadilty During the measurement rotate one handwheel to adjust the focus till you clearly see the indication of the lens diopter through the reading window Fig 11 3 10 Astigmatism axis measuring hand wheel Fig 12 It is used to measure and fix angle of astigmatism axis of cylindrical lens and base angle of prism lens Fig 12 3 11 Illuminating bulb chamber Fig 1 3 Open the lower cover of the device one can easily and quickly change the bulb Fig 11 3 12 Instrument s inclination regulating handle Fig 1 4 It allows user to freely regulate inclination of instrument so that he she is able to work at a comfortable posture After screwing out the handle the user can incline the device to a required angle according to the state of working table and then lock the handle 10 Fig 12 4
8. cal diopter The second step Rotate diopter measuring handwheel and at the same time rotate astigmatism axis measuring handwheel to focus spherical marking lines clearly once more Now the reading on the reading window is 1D which is the reading at the first lime Then rotate the diopter measuring hand wheel to focus cylindrical marking lines clearly At this tirne the reading on the reading window is 2 5D which is the reading at the second time The third step 2 5D 1D 3 5D i e astigmatism degree is 3 5D and axis direction is directly read off according to astigmatism axis measuring 13 handwheel which is 30 as shown in Fig 15 and Fig 16 Fig 15 Image at 1D Fig 16 Image at 2 5D Illustration 1DS 3 5DC X 30 can be converted into 2 5DS 3 5DCX120 and can be also measured using this instrument which will not be described here again 4 6 Calculation of Prism Lens 4 6 1 Measurement of diopter below 5A Place prism lens on the objective lens bearing seat and aim its optical center at center of objective lens bearing seat i e optical axis Rotate diopter measuring handwheel to focus lines of marker reticule 3 clearly the marking linescan be seen to deviate from center of eyepiece reticule 8 The deviating direction is the base direction of prism eyeglass Rotate astigmatism axis measuring handwheel so that the middle one of 3 long green marking lines passes through the center of eyepiece reticule 8 thus val
9. de calliper Demarcation of spherical lens A Rotate diopter measuring handwheel to focus lines of marker reticule 3 clearly B Lightly move the lens to find the right optical center C Make 3 point printing marks by the use of printer Demarcation of the axis of sphero cylindrical lens A Rotate astigmatism axis measuring handwheel to a required angle B Rotate diopter measuring handwheel and at the same time turn lens to focus cylindrical marking lines clearly C Lightly move the lens to find the right optical center D Make 3 point printing marks by the use of printer Demarcation of the base of prism lens A Rotate astigmatism axis measuring handwheel to a required angle B Rotate diopter measuring handwheel to focus lines of marker reticule 3 clearly C Lightly turn prism lens so that the middle one of 3 long green marking lines passes through center of the eyepiece reticule 8 15 9 1 9 2 5 3 9 4 5 5 5 6 D Make printing point marks by the use of printer Maintenance Factory adjusted control of the instrument has been carried out please do not dismantle it at will so as not to influence its indicating precision The instrument should be used in a dry and air circulated indoor place in order to prevent the optical components from damping and wildewing After using it clean the instrument and cover lens with dust shield Prevent the instrument from severe vibration or impact in order to aviod
10. dwheel so that the torus composed of 12 small green dots is imaged into clear looped short cylindrical lines Then rotate astigmatic axis measuring handwheel again so that spherical marking line 2 long green ones and torus short lines are in the same direction At the same time conduct fine tuning of the diopter measuring handwheel to make 2 long lines clearest Now write down a reading value of diopter The second step Rotate diopter measuring handwheel again so that cylindrical marking lines 3 long green ones are focused to be clearest and in the same direction of the torus short lines Now write down again a reading value of diopier and also note down the reading value of the lens angle of astigmatism axis on the astigmatism axis measuring handwheel which can be also read off according lo eyepiece reticule 8 The third step Calculation of the degree of astigmatism Subtracting reading values of the diopter of above stated 2 times is just the astigmatism dergee of the said lens 12 Diopter of a sohero cylindrial lens may be written in various forms where spherical diopter may be expressed as low luminosity or high luminosity and cylindrial diopter i e astigmatic degree expressed as a positive or negative number This can be done simply by way of luminosity transformation In this operation instruction spherical diopter is assumed to be low luminosity The procedures of measurement are shown as follows A Calculation of sphe
11. hile the optical reading reticule 10 forms its image on eyepiece 8 through front lens 12 and back lens 14 At this time human eyes are able to clearly observe the images of reticule 3 eyepiece 8 and reading reticule 10 During the operation place lens at position of diaphragm 5 Objective lens bearing seat turn and axially move marker reticule 3 so that it is imaged clearly Then the scale interval shown on the reading division board 10 is just the numerical value of diopter 3 Functions 3 1 Eyepiece Fig 2 Eyepiece section is equipped with a spiral focusing unit whose range of focusing is 5D so as to suit different eyesights of people Fig 2 3 2 Eyepiece reticule and marker reticule Fig 3 Fig 4 Reticule in the field of view of eyepiece is shown as Fig 3 On the reticule is divided with measuring scale and dividing disc of prism degree Integer degree of prism is directly read on the measuring scale and decimal one estimated according to the degree on the measuring scale The dividing disc is ruled with an interval of 5 The marker reticule is shown as Fig 4 3 long green lines are in the horizontal position 3 3 3 4 Fig 3 Fig 4 Reading division board Fig 5 In eyepiece 9 field of vision the reading window is in the lower part of eyepiece reticule 8 The range of reading reticule is 25D The graduation between O and 5D are at an interval of 0 125D those between 5D and 25D arc at interval of
12. ject to change without notice 9990 NW 14 Street Suite 105 Doral FL 33172 Telephone 888 334 4640 19
13. rical diopter Focus spherical marking lines 2 long green ones cleraly Please note that there will be 2 reading numbers Rotate diopter measuring handwheel and at the same time rotate astigmatism axis measuring handwheel focus spherical marking lines 2 long green ones clearly and write down a reading value of diopter Then rotate astigmatism axis measuring handwheel by 90 focus spherical marking lines 2 long green ones clearly again and note down a new diopter reading value Compare reading values of 2 times and take a reading value with smaller absolute value i e low luminosity as the spherical diopter of the said lens B After fixing spherical diopter rotate diopter measuring handwheel again to focus cylindrical marking lines 3 long green ones clearly Write down the diopter reading value high luminosity at this moment C Difference of the readings in 2 times is the astigmatism degree of the said lens and its axis direction is directly read off according to astigmatism axis measuring handwheel Example 1 Calculation of 1DS 3 5DC X 30 The first step Rotate diopter measuring handwheel and at the same time rotate astigmatism axis measuring handwheel to focus spherical marking lines clearly Now the measured data are diopter 1D axis angle 30 Then rotate astigmatism axis measuring handwheet by 90 to focus spherical marking lines clearly Now the measured data are diopter 2 5D axis angle 120 Take 1D as spheri
14. sm diopter standard model Minimum scale value Strengthened model Minimum scale value Prism base angle Minimum scale value Regulation of ocular visibility Size of lens Overall dimensions of device Weight standard model Strengthend model Lighting lamp O 25D 0 125D at O 25D 0 25D at 5D 25D O 180 40 O 5A 1A O 20A 1A O 180 40 5D a16mm g18mm 2 omm X 130mm X 455mm 5 6kg 5 kg 220V 110V 15W 18 mms M 200 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 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 sub
15. ue of base angle of prism lens can be read off according to astigmatism axis measuring hand wheel Prism diopter can be estimated according to the reading on eyepiece reticlue 8 as shown in Fig 17 Fig 17 In the figure Diopter of prism lens is estimated as 2A and dividing line image of marker reticule 3 deviates by 30 to upper right side Measured data of the said prism lens include prismdiopter 2A and base angle 30 14 4 6 2 Measurement of diopter above 5A 4 7 4 7 1 4 7 2 4 7 3 4 7 4 The prism compensation device is needed when measuring lens diopter above 5A Rotate the diopter measuring handwheel and turn the angle to adjust the devision line on marker reticule 3 to the proper position Then you get two reading from eyepiece reticule 8 and the prism compensation device The sum of the two numbers is the prism diopter of the lens the base angle can be read from the prism compensation device Demarcation of Lens Determination of the optical center of 2 assembled lens Place the glasses on the instrument First choose any one of glasses and rotate diopter measuring handwheel to make it in focus at the same time lightly move glasses frame so that the focused image is at the center of optical axis and make a center printing mark on the lens by the use of printer Then repeat the operation to print a mark on another lens Now simply measure the distance between center printing marks of these 2 lens by the use of sli
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