Manual Refractor ERF-2600 Ezer
Contents
1. u Q 00 Q m 9 C oo o sone 2 ia SCHO VZD NRKE OZRE CHS DKVN HCZD NEV KRSE ZDEV OSH RCNK VZR HSEO VHSC DEZ ONKR KON COVS ston CM Kivo INE OMIM aem T c 8 2 6 9 000 9 O C O Om 5 H K 2 3 9 10 intere Wy 2 8 11 12 ene Onova 10 Distance Compensation If the distance between the instrument and the examinee is not as specfied distance compensation should be carried out See 6 F Fig 7 When the Sphere power is Plus If the distance is shorter compensation If the distance is longer compensation When the Sphere power is Minus If the distance is shorter compensation If the distance is longer compensation Example If with a sphere power reading of 10 00the distance is 5mm longer than specified a correction should be 0 52 according to the compensation table making 10 52D 10 00 0 52 10 52 Distance Compensation Table with Sphere Distance 1 2 3 4 5 6 mm mm mm mm mm mm 4 1 00 001 002 003 004 005 006 007 008 009 01 2 00 004 008 01 02 02 02 03 00 04 04 3 00 01 02 03 04 05 06 07 08 09 10 4 00 02 03 05 07 08 4 5 00 03 05 07 u 2 6 00 04 07 10 16 B 7 00 05 10 14 21 25 8 00 06 13 19 27 3 9 00 08 16 44 34 42 10 00 10 20 30 42 52 11 00 12 25 87 So 64 12 00 1 30 45 6 77 13 02. a point light or a fixation point from the projector at a distance B Insert the RMH auxiliary lens for the right eye and the O open for the left eye C When seen with the right eye the image appears as in Fig 16 and when with left eye a point light appears as in Fig 15 Fig 15 Fig 16 CD If there is no phoria when seen with both eres the two images appear as in Fig 17 If there is a horizontal phoria the two image appear disaligned as in Fig 18 and Fig 19 Fig 17 Fig 18 Fig 19 A If there is a horizontal phoria set the rotary prism for the left eye at click stop position in the horizontal phoria measuring direction B Tuan the rotary pria knob slowly until the two images are aligned as in Fig 17 The scale reading when both aligned is a degree of the horizontal phoria 14 Measuring Heterophoria Vertical Measured in the same procedure as above with use of the RMV auxiliary lens If used with the WMH and WMV auxiliary lenses for the left eye also measured in the same procedure OY Se e c 15 Details of Rotating Near Point Chart The standard examination distance for this near point chart is 40cm Direction 7 Direction 0 1 0 3 Alphabetical letters 0 5 1 0 8 Alphabetical letters 0 1 0 4 Cross cylinder grid thin lines 9 Alphabetical letters Cross cylinder grid thick lines 10 Astigmatic chart Alphabetical letters 11 Vertical row of letters Alphabetical letters 12 Vertical row of letters
3. eens T Precision measurements of astigmatic 6 8 9 Precision measurements 85 8 10 Precision measurements spherical power 9 1 Eye balance hein xv E DR ERE boe ouv e eiat 9 12 Measuring presbyopia ccc cece cece eee ence ee enna mr 10 13 Measuring heterophoria horiZontal ccccceeseeeeseeeeeeeeeeneeeaes 10 14 Measuring heterophoria vertical 11 15 Details of rotating near point 11 12 16 Distance compensation table 13 14 I Mall specifications eo ondas o E oiu tds 15 1 Standard equipment 1 Near point scale 1 pce 8 Silicon cloth 1 pce 2 Main instrument 1 set 9 Rotating near point chart 1 pce 3 Fitting screw 1 pce 10 Dust cover 1 pce 4 Near point chart holder 1 pce 11 Air brush 1 pce 5 0 12C auxiliary lenses 2 pcs 12 Lens cleaning fluid pce 6 2 00C auxiliary lenses 2 pcs 13 Glasses cloth 7 Accessory case 1 pce 14 Instruction manual e 3 VIEW TESTER Pd Fig 1 4
4. 0 8 35 72 9091 14 00 21 4 6 8 106 115 00 34 47 71 9 1133 116 00 27 53 81 1 11 1 39 Distance Compensation Table with phere Reading 1 00 2 00 3 00 4 00 5 00 6 00 8 00 29 00 l 10 00 11 00 12 00 13 00 14 00 15 00 16 00 1 00 18 00 19 00 Distance 1 001 01 01 02 03 04 05 06 08 10 12 14 16 19 22 25 28 31 99 2 002 01 02 03 05 07 10 13 16 20 24 28 33 38 43 49 99 62 69 003 02 03 05 07 10 14 19 24 90 36 42 48 95 63 ite 81 004 02 04 06 10 15 20 29 EP 38 46 99 64 14 85 96 1 08 005 02 04 08 12 17 24 91 39 48 57 67 78 90 006 03 05 15 22 30 38 47 97 il AT 25 33 42 59 50 79 93 008 03 07 12 19 28 38 49 61 74 88 1 04 1 22 1 61 1 82 2 04 009 04 08 l 22 31 42 4 67 82 99 01 04 08 15 24 35 47 60 74 90 1 08 1 49 1 71 1 95 2 20 2 46 2 73 3 02 I7 Main Specifications sphere powers range 16 75D with minimum reading 0 25D or 0 12D when 0 12D auxiliary lens or optical 0 12Dlens is in use 26 75D to 29 00D when op
5. 4 The polystyrene case should be retained for use when sending the instrument back to the distributor or manufacturer for overhauled 2 Subjective Eye Tester A New leveling mechanism B Fingertip adjustment for sphere power control Just the right figure from 0 to 19 00D and 0 to 16 75D obtained with light fingertip control of the fast feed dial Optional 10 00D lenses are available C Measuring astigmatism Readings 0 to 6 00D which become possible up to 8 00Dwith accessory lenses 2 00D Used in combination with the cross cylinder for precision measurement D Cross cylinder 0 25D Tests are speeded up by eliminating the need for axis adjustment a very efficient synchronizing mechanism being provided and the loupe is readily turned by means of the knob E Rotary prism The wider 1AD spacing the 20AD range simplifies reading and incorporation into the main body of the instrument means that a maximum field of view is obtained F Unique new convergence system mechanism Convergence lever control for precision near point readings G Wide range of auxiliary lenses combinations See details on the page 6 H Precision Machined to finest tolerances The use of top quality bearings and elimination of the need for periodic lubrication 3 Nomenclature 1 Locking knob 2 Locking screw 3 Clamp bracket 4 Near point scale receiver 5 Level 6 Auxiliary lens mark 7 Cross cylinder 8 Cross cylinder rotating kn
6. a of the examinee to surface of the lens 12mm Fig 7 Measuring Myopia and Astigmatism A Begin readings at about 3 0D in the case of an examinee with naked eye visual power around 0 5 0 6 and in the case of an examinee who wears spectacles fist find the power of the spectacles with a Lensmeter and begin readings with a figure added 3 00D to the measured power B First the right eye should measured Cover the left eye Turn the auxiliary lens control knob 17 and when the OC mark is aligned with the auxiliary lens mark 32 the left eye is covered Fig 8 C Turn the sphere power control ring on one side and reduce 0 25D at a time 3 00D 2 75D 2 50D until a visual acuity of about 0 5 is obtained AA W AK 6 Fig 9 Fig 10 a N ae M i D Have the examinee look at astigmatic visual acuity chart Fig 9 E Think of the astigmatism chart as the dial plate of a clock and supposing that the examinee answers that he cn see the lines pointing in the direction of one O clock clearly take 1x30 times 30 and align the astigmatic axis index 31 with the 30 position by turning the cylinder lens axis control ring 13 F Turn the cylinder lens power control knob 14 increasing the power until all lines on the astigmatism chart appear to be of equal darkness G Turn the sphere power control ring 9 until a visual acuity of about 1 0 is obtained example In ca
7. f the green can be seen well increase the reading by 0 25D Continue to make adjustments until both red and green tests can be seen equally well D Have the examinee look at the visual acuity chart and try to obtain a maximum visual acuity that he can read E Have the examinee look at teat where maximun visual acuity has been obtained and add spherical power by 0 25D F If the test is out of focus restore the spherical power to the former reading and measurements are finished now but if in focus carry out the following procedure G Add more 0 25D and restore the spherical power where the test has been out of focus to the former reading and measurements are finished now H Measure the left eye in the same procedure 1 Eye Balance Test A Have the examinee look at about 0 7 point on visual chart B Set the rotary prisms 12 at the right and left main apertures 28 NOTE the rotary prism knobs 30 should be set at click shop position on the ears side of the examinee Next insert a 2A DBU prism in the left anda 2A DBU in the right see Fig 13 The visual line from the left eye moves in the lower direction he can see it split into two C When the examinee looks at the test chart with binocular vision he can see it split into two an upper and lower i e the lower part in the left eye and the upper part in the right eye If both upper and lower parts can be seen equally well it shows that the right and left eyes are balanced f e
8. he P marks in the same direction as astigmatic axis and set it at click stop position B Turn surface and II alternately and have the examinee look at them If both surfaces can be seen equally well there is no abnormality but if one is moreclearly seen than the other carry out the following procedure C Stop turn at the surface which is clearly seen Then if the P marks align with the red dots add astigmatic power 0 25D by turning the cylinder lens power control knob 14 and if the P marks align with the black dots deccrease astigmatic power 0 25D D And again turn surfaces and the cross cylinder and repeat procedures from B When both surfaces can be seen equally well it is determination of an astigmatic Axis E Measure the left eye in the same procedure and after finished move the cross cylinder from the main aperture 10 Precision Measurement of Spherical Power A For fine adjustment of the sphercal power first the right eye should be measured with occlusion of the eye B Have the examinee look at both the red and green tests on the visual acuity chart and have him compare clearness of the black in the red andgreen tests If the in both tests can be seen equally well it shows that the corrected power is actually correct but if either of there colors can be seen well carry out the following procedure the red can be seen well increase the reading in the sphere power reading window 11 by _0 25D and i
9. ither of the upper and lower parts can seen well carry out the following procedure D Add 0 25D at a time to the spherical power for the eye where the test charthas been able to be seen well until both eyes can balanced If balance can not be obtained try improve the visual acuity the dominant eye Fig 13 12 Measuring Presbyopia A Make perfect correction of the refraction anomaly in distant vision and make a setting of the instrument based on the resuit B Set a 10 50 auxiliary cross cylinder lens in place for each eye C Tuan the convergence levers 5 inward D Set a near point chart in a fixed place of the instrument E Allow the examinee to choose the distance at which the chart is set up and seleca cross cylinder grid on the near point chart Fig 14 Fig 14 F Have the examinee look at the cross cylinder grid with both eyes to conpare darkness of the vertical and horizontal lines G Add the sphere powers in both the right and left sphere power reading windows 0 25D ata time simultaneously and stop this procedure when both the vertical and horizontal lines are seen equally well Now the spherical power for near point is determined H The value taken the distance sphere from the near point sphere is an ADD power This is required for checking clearness at intermediate distance or prescription of a continuous vision lens 13 Measuring Heterophoria Horizontal A Project a fixation light
10. ob O Forehead rest adjusting knob 10 Cylinder lens axis index 11 Vextex distance display window 12 Rotary prism 13 Cylinder lens axis scale 14 Astigmatism scale 1 5 Accessory lens pinhole 1 6 Astigmatic axis index 17 Cylinder lens axis control knob 18 Cylinder lens power control knob 19 Cylinder lens axis scale 20 Rotary prism knob 21 Sphere power reading window 22 Sphere power control ring 23 Auxiliary lens pinhole 24 Auxiliary lens control knob 25 Sphere power rapid feed dial 26 Convergence lever 27 Interpupillary adjustment knob 28 Interpupillary scale 20 Levelling knob 30 Forehead rest 31 Main aperture 32 Sanitary face shield Fig 2 hwo hw 4 Details of Auxiliary Lenses 12 Kinds of auxiliary lenses can be set at each main aperture on right and left sides W 1 mmu PF n _e p oa di r aa A N ae xS M r DS fig 3 o eae Open aperture 9 0c re Occluder 2205 90 EE 0 50 cross cylinder Ads 6 prism diopter base Up Le 2AN r 10 prism diopter base In sin RTT Pinhole 20M e 0 12D auxiliary lens a TET Red filter c OE Green filter ail CE Red maddox rod horizontal WMH White maddox rod vertical ai Red maddox rod vetical White maddox rod vertical ial oo ee ee Polarzing filter axis 135 m Polarizing filter axis 45 Retinoscopic lens 2 00D fo
11. r 50 cm 2 Measuring performance A Provides highly accurate readings over a wide range Used in measurements of Myopia Astigmatism Hyperopia Presbyopia Hrterophoria Range of Accommodation Convergence Aniseiconia Stereopsis and Binocular Vision B Rapid accurate readings on binocular visual balance C Speedy astigmatism tests With interlocking mechanism of the cross cylinder lens axis and the cylinder lens axis control ring one touch accurate astigmatism readings are now possible D In short middle and long distance test it is possible to have the optical axis of the lens and the line of examinees s vision coincide 6 Preparation before Eye Testing A Have the examinee sit on an eye examination chair B Adjust both readings the sphere power reading window 11 and astigmatism scale 19 to 0 00 Fi9 4 C Adjust the interpupillary scale 7 setting to the interpupillary distance of the examinee Fig 5 D Level the instrument with the leveling knob 3 while watching the level 6 Fig 6 E Align the examinee s eyes with the righ and left main apertures 28 and tighten the arm fixing knob F Turn the forehead rest adjusting knob 8 until the scale O on the corneal backsight 26 the corneal foresight 25 and the vertex of the cornea of the examinee are all in a straight line Fig 7 Fig 4 Fig 5 Fig 6 X 0 position f Examiner Re Examinee 8 Distance form the vertex of the corne
12. re FHRF 2600 MANUAL REFRACTOR USER S MANUAL MANUAL REFRACTOR Thank you for your taking MANUAL REFRACTOR this time This MANUAL REFRACTOR is c ompac tldesigned to make accurate measurements of complicated Visual functions You are required to read this manual carefully in order to become familiar with features and structures of this instrument opecial Attention This is a precision instrument and should be handled carefully The plastic dust cover should be used whenever the instrument is not use The instrument should not be used or left in a hot and humid or dusty place Do not break up the instrument as sufficient optical adjustments have been made o it at factory Remove dust off the lens with an air brush If the lens should have been smeared with Fingerprints wipe it clean with a fresh cloth softly We would recommend you to have the lenses cleaned by a specialist yearly Table of Contents Ts Standard equiprmefit eee uei Epid Se aesti ce va eex rod ba dadeds a aidedag 2 tester aan Pat Rue 3 5 NOMCNGIATUN Gia 4 4 Detail of auxiliary lenses sese 5 2 Measuring performance sess enm me nen nnn 5 6 Preparation before eye testing cece sees 6 1 Measuring myopia and astigMmatiSM cccccee cece
13. se of myopia the sphere power is 1 75D to be minimum degree when a maximum visual acuity of 1 0 is obtained ophere power Visual acuity 1 00D 0 7 1 25D 0 8 1 50D 0 9 2 00D 1 0 2 25D 1 0 H Measure the left eye in the same procedure 8 Precision Measurement of Astigmatic Axis A Set the cross cylinder 10 at the main apreture B Turn the periphery of the cross cylinder to adjust the axis of the cross cylinder rotating knob 29 in the same direction as astigmatic axis 7 E and set it at click stop position C Now have the examinee look at visual acuity charts about twosteps lower than those which he has been able to see For esample if he has been able to read at 1 0 point now have him look at those for 0 8 D Tuan surfaces and lof the cross cylinder 10 alternately and have the examinee look them If both surfaces can be seen equally well there is no abnormality but if one is mire clearly seen than the other carry out the following procedure E Stop turn at the suface which is clearly seen next more and shift the astigmatic axis 5 in the direction of red dots on the cross cylinder by the cylinderlens axis control rinf 13 F When surfaces and II can both be seen equally well after this method is used and tests repeated two or three times It is determination of an astigmatic axis Fig 11A 9 Precision Measurement of Astigmatic Power A Turn the periphery of the cross cylinder to adjust the axis of t
14. tical 10 00Dlens is in use Cylinder powers range 0 to 6 00D with minimun reading 0 25D or 0 12D when auxiliary lens is in use 0 to 8 00D when 2 00D auxiliary is use Astigmatic axis scale 0 to 180 in 5 steps Cross cylinder 0 25D reversal type synchronized with astigmatic axis 0 50D optical Rotary prism 0 to 20A Din 1A step Auxilisry Right eye Left eye O Open aperture OC Occluder 0 50 Fixed cross cylinder 6AU 6 prism dioter base Up O 10Al 10 prism diopter base In PH Pinhole 0 12 0 12D sphere lens RL Red filter GL Green filter RMH Red maddox rod horizontal WMH White maddox rod horizontal RMV Red maddox rod vertical WMV White maddox rod vertical P 45 Polarizing filter axis 45 P 135 Polarizing filter axis135 R Retinoscopic lens 2 00D for 50cm Interpupillary adjustment 48mm to 80mm in 1mm steo right and left synchronized Forehead rest adjustment 16mm backward and forward Convergence The optical axces of the lenses are aligned at a distance of 400mm from the vertexes of the corneas 2mm each for right and left inward Corneal distance device 2mm forward and 5mm backward from standard plane with scale Effective field of view 19mm ns CRF 2600 MANUAL REFRACTOR 9990 NW 14 Street Suite 105 Doral FL 33172 Telephone 888 334 4640
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