Nidek Medical RT-600 Operator's Manual
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Nidek Medical RT-600 Operator's Manual

Nidek Medical RT-600 Operator's Manual

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NIDEK
REFRACTOR
Model RT-600
OPERATOR'S MANUAL

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Summary of Contents for Nidek Medical RT-600

  • Page 1 NIDEK REFRACTOR Model RT-600 OPERATOR’S MANUAL...
  • Page 2 HEAD OFFICE : 34-14, Maehama, Hiroishi-cho, Gamagori, Aichi 443-0038, Japan Telephone: (0533) 67-6611 Facsimile: (0533) 67-6610 TOKYO OFFICE : 6th Floor, Takahashi Bldg., No.2, 3-chome, Kanda-jinboucho (International Div.) Chiyoda-ku, Tokyo 101-0051, Japan Telephone: (03) 3288-0571 Facsimile: (03) 3288-0570 Telex: 2226647 NIDEK J NIDEK INCORPORATED : 47651 Westinghouse Drive Fremont, California 94539, U.
  • Page 3 BEFORE USE, READ THIS MANUAL. This Operator's Manual contains information necessary for the operation of the NIDEK refractor Model RT-600. This manual includes the operating procedures, safety precautions, and specifications. IEC standards are applied in this manual. The safety precautions and operating procedures must be thoroughly understood prior to operation of the device.

  • Page 4: Table Of Contents

    Table of Contents § 1 INTRODUCTION ......................1-1 1.1 Outline ........................1-1 1.2 Indications for Use ....................1-1 1.3 Classifications ......................1-2 1.4 Symbol Information ....................1-2 § 2 SAFETY ........................2-1 2.1 Operation ........................2-1 2.2 Storage ........................2-2 2.3 Transport ........................

  • Page 5: Introduction

    § 1 1.1 Outline NIDEK Model RT-600 has been developed to renovate the conventional refractor, assuming a new aspect, to turn the thought of the people who used the conventional model, to an entirely different subjective refractor, easy to master with the highest accuracy.

  • Page 6: Classifications

    The RT-600 does not have any part to be sterilized or be disinfected. [Degree of protection against flammability] The RT-600 is classified as an equipment not suitable to be used in a potentially flammable environment. Do not use near flammable materials.

  • Page 7: Safety

    SAFETY § 2 In this manual, Signal Words are used to designate a degree or level of safety alerting, whose definitions are as follows. WARNING: Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION: Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury or property damage...

  • Page 8: Storage

    2 - 2 2.2 Storage CAUTION • Do not store the device in a place where it may get wet or where poisonous gas or liquid is stored. • Avoid storing the device in an area with excessive heat, humidity, or dust. To preserve the appearance or internal parts of the device, avoid direct exposure to sunlight.

  • Page 9: After Use

    2 - 3 CAUTION • Be sure to level the refractor before use. If it is not level, the accuracy of the refraction may be affected. Level the refractor by turning the leveling adjustment knob until the bubble is centered in the level. •...

  • Page 10: Maintenance And Checks

    2 - 4 2.6 Maintenance and Checks CAUTION • Disassembling for service is not permitted except at NIDEK or authorized distributor. • Never use an organic solvent such as paint thinner to wipe the exterior. This may ruin the surface. •...

  • Page 11: Labels

    2 - 5 2.8 Labels The following labels provide safety information about each part.

  • Page 12: Configurations

    CONFIGURATIONS § 3 This instrument has a pair of battery. Each battery includes sphere and cylinder lens assembly as well as auxiliary lenses. Brief descriptions of the several parts are given so that the operator will understand each function. Near point rod clamp screw P.D.
  • Page 13 3 - 2 Patient’s window Level Patients have to peep from the back side. This is to set up a standard of the horizontal adjustment. Near point rod clamp screw Spherical disk To insert the near point rod into the holder and tighten the near point rod.
  • Page 14 3 - 3 Rotation adjustment knob Leveling adjustment knob Yoke Mounting bracket Clamp knob Body support P.D. adjustment knob Convergence lever Turret Spherical lens display cover Rotary prism indicator Body Cylinder axis indicator Cylinder power scale Set pin Forehead rest knob Cylinder axis reference scale...
  • Page 15 3 - 4 Cylinder power scale Yoke Cylinder powers are shown here. Body support Set pin Cylinder auxiliary lenses (-2.00D, -0.12D) as Body the standard accessories are set here by this set pin. Turret This will interchange the cross cylinder and Forehead rest knob the rotary prism.
  • Page 16 3 - 5 Forehead rest Face shield Cover glass...
  • Page 17 3 - 6 Forehead rest Patient’s forehead should touch the rest dur- ing measurement. Clean it before each mea- surement. Face shield Patient’s face touches the shields during mea- surement. Clean them before measurement. Cover glass Patients look at the chart through these win- dows.

  • Page 18: Operating Procedures

    OPERATING PROCEDURES § 4 4.1 Basic Operation Mount the refractor on the ophthalmic stand arm. Stand arm Clamp knob Set the bracket to the support shaft of the stand arm and fix it by the clamp knob The fixing screw of the accessory should be screwed in the support shaft from the lower part of the bracket Fixing screw...
  • Page 19 4 - 2 6. Set the sphere power. While seeing the sphere power scale and turn the spherical disk Sphere power can be changed 3.00D step by turning the spherical power quick forwarding dial 7. Set the cylinder axis. Align the cylinder axis reference scale to the cylinder axis indicator by turning the cylinder axis knob...

  • Page 20: Refraction Ways In General

    4 - 3 4.2 Refraction Ways in General Before refracting by this instrument, it is necessary to know that patient’s P.D., the spherical power based the data of visual examination, the cylinder power and axis found by an objective examination. 4.2.1 Setting the refractor 1.
  • Page 21 4 - 4 5. Confirm the center of the pupil be aligned in the patient’s window by seeing from the front. 6. Adjust the forehead rest by the forehead rest knob, and set the corneal vertex distance to 13.75mm. When the image of patient’s eye is the center of the vertex distance watching window, the corneal vertex distance is 13.75mm.

  • Page 22: Visual Acuity Checking

    4 - 5 4.2.2 Visual acuity checking 1. Turn the auxiliary lens knob by seeing the auxiliary lens scale and set the right eye be opened as “0” and left eye be occluded as “OC”. 2. Add the sphere power based data of inspected visual examination by turning the spherical disk.
  • Page 23 4 - 6 <RADIATION TEST> 1) Align the radiation chart. 2) By turning the spherical disk, add the S -0.25D step until the figure 1 to 12 on the radiation chart can be read out. 3) In case any lines of the radiation chart is seen deeply, those lines are cylinder axis.

  • Page 24: Red Green Test

    4 - 7 4.2.3 Red Green test 1. Align the red green chart. 2. Make sure which chart could be seen more clearly, the black ring on the red ground or the black ring on the green ground. 3. If the black ring on the red ground could be seen more clearly, add the S -0.25D by turning the spherical disk.

  • Page 25: Cylinder Axis

    4 - 8 4.2.4 Cylinder axis 1. Align the dots chart. (If unavailable, the 0.7 chart) 2. By turning the turret, set the cross cylinder to align patient’s window. 3. Align the revolving axis of the cross cylinder to the cylinder axis indicator and click. 4.

  • Page 26: Cylinder Power

    4 - 9 4.2.5 Cylinder power 1. Align the dots chart. (If unavailable, the 0.7 chart) 2. By turning the turret, set the cross cylinder to align patient’s window. 3. Align the “P” mark on the cross cylinder to the cylinder axis indicator and click. 4.

  • Page 27: Sphere Power Measurement

    4 - 10 4.2.6 Sphere power measurement 1. Align the red green chart. 2. Make sure which the chart can be seen more clearly the black ring on the red ground or the black ring on the green ground. 3. When the black ring of the red ground is seen more clearly, add the S-0.25D by turning the spherical disk.

  • Page 28: Left Eye Power Check

    4 - 11 4.2.8 Left eye power check Turn the auxiliary lens knob by seeing the auxiliary lens scale and set the right eye be occluded as “OC” and left eye be opened as “O”. Return to “4.2.2 item 2.”, and proceed the check to “4.2.7”. 4.2.9 Both eye balance test 1.

  • Page 29: Stereoscopic View Test

    4 - 12 4.2.10 Stereoscopic view test 1. Align the accurate stereoscopic view chart. 2. By the turning the auxiliary lens knob, set the auxiliary lenses of left and right to polaroid “P”. 3. Check the stereoscopic view test by the accurate stereoscopic view chart. If the stereoscopic view is unavailable perform the binocular function examination.
  • Page 30 4 - 13 4. If the patient is above 50 years old, add the S+1.00D by turning the spherical disk. 5. Set the near point card to the nearest distance (the near distance of the patient). 6. Set the ±0.50 cross cylinder in both auxiliary lenses by turning auxiliary lens knob. 7.

  • Page 31: Distance Correction Of Corneal Vertex Point

    4 - 14 4.2.12 Distance correction of corneal vertex point This instrument is designed that the correct distance between the lens and the corneal vertex is 13.75mm. If the corneal vertex distance is not same as appointed, correct the power by applying the distance correction table.
  • Page 32 4 - 15 Example 2 When measured value is -11.00D by this instrument and the corneal vertex distance is 4mm longer, the correction value should become +0.46D from the correction table and the revised value should be : (-11.00D) + (+0.46D) = (-10.54D) Example 3 (When desired to have the fitting of a glasses be 12mm.) When measured value is -5.00D by this instrument and the corneal vertex distance is 3mm longer, the appointed distance is 1.75mm longer against 12mm, the fitting of the glasses.
  • Page 33 4 - 16 DISTANCE CORRECTION TABLE ( MINUS ) Distance Distance Distance Distance Distance Power 1 mm 2 mm 3 mm 4 mm 5 mm –1.00 0.001 0.002 0.003 0.004 0.005 –2.00 0.01 0.01 0.02 0.02 0.02 –3.00 0.01 0.02 0.03 0.04 0.04...

  • Page 34: Refraction Examples By Various Auxiliary Lenses

    4 - 17 4.3 Refraction Examples by Various Auxiliary Lenses 4.3.1 Heterophoria measurement (Horizontal maddox) 1. Align a fixed point chart. 2. Turn the auxiliary lens knob while seeing the auxiliary lens scale. Set the right eye horizontal maddox as “RMH” and the left eye be opened as “O”. 3.

  • Page 35: Heterophoria Measurement (Prism Dispersion)

    4 - 18 4.3.2 Heterophoria measurement (Prism dispersion) 1. Align the horizontally lineal figures chart. 2. By turning the auxiliary lens knob, make the right eye be opened as “O” and left eye be kept at prism dispersion as “10∆ I”. 3.

  • Page 36: Maintenance

    MAINTENANCE § 5 5.1 Cleaning the Inner Lenses 1. Make up all the scales as 0 and or “O” as open. 2. Make the P.D. at its maximum 75mm. 3. Remove the Face shield. 4. Remove the two screws and thin plate and take off the cover glass. 5.

  • Page 37: Cleaning The Forehead Rest And Face Shields

    5 - 2 5.2 Cleaning the Forehead Rest and Face Shields Always clean the Forehead rest and Face shields before each refraction. Wipe the Forehead rest and Face shields with a clean cloth and a diluted an alcohol or neutral detergent solution.

  • Page 38: Specifications

    SPECIFICATIONS § 6 · Sphere power : Range : +16.75D to -19.00D When applied with auxiliary lenses +10.00D, -10.00D (Option) : +26.75D to -29.00D Step : 0.25D When applied with auxiliary lens +0.12D Step : 0.12D · Cylinder power : Range : 0D to -6.00D When applied with auxiliary cylinder lens -2.00D :...
  • Page 39 6 - 2 “P” : Polaroid (Right eye : 135º, Left eye : 45º) * To be used for heterophoria, binocular balance, stereoscopic view, etc., for various polarizing test. “RMV” & “WMV” : Vertical maddox (Right eye : Red, Left eye : White) * Can be used for heterophoria, measurement.

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