Instruction Manual
38 Pages
Preview
Page 1
ENGLISH
INSTRUCTION MANUAL
LENSMETER
LM-8
Copyrights and trademarks LM-8 is a trademark of the TOPCON Corporation. © TOPCON 1999
INTRODUCTION
Thank you very much for purchasing the TOPCON LM-8 Lensmeter. This Instruction Manual gives a description of the TOPCON LM-8. This includes its main features and basic operation, troubleshooting and the checking, maintenance and cleaning of this instrument. Please read the section Displays for safe use on page v and the section Safety precautions on page vi carefully before the instrument is put into operation. To get the best use from this instrument, read these instructions carefully and place this manual in a convenient location for future reference.
Lensmeter LM-8
Precautions
● This Lensmeter is a piece of precision equipment, which needs to be
used and kept in places under normal conditions regarding temperature and humidity. Do not expose the instrument to direct sunlight. ● To ensure best use, install the instrument on a level floor, free from any vibration. ● Always check that all cables are plugged in correctly before use. WARNING: For your own safety always make sure the instrument is correctly grounded for compatibility with high currents. Never disable the grounding plug of the power cord. ● Use a power supply within the range of ±10% of the rated voltage of ● ●
●
●
AC 100V ±10% (50/60 Hz). Make sure that no fingerprints or foreign matter remain on the objective lens. TOPCON is not responsible for any modification caused by disassembly or adjustments made by unauthorized dealers or persons. If any trouble occurs with your instrument or its accessories, first refer to the troubleshooting guide in this manual and carry out the checks listed there. If nothing is found during your check, then contact your authorised dealer or TOPCON to service it. Always turn the power source off and place the dust cover on the instrument when it is not in operation.
Selecting externally connected equipment The TOPCON LM-8 complies with the CE marking. Before connecting a personal computer, image recorder, image printer, TV camera, or monitor to the TOPCON product, make sure that such external equipment is in compliance with the CE marking.
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Introduction
Displays for safe use Important warnings are placed on the products and inserted in the instruction manuals, in order to encourage the safe use of products and prevent any danger to the operator and others or damage to existing facilities. We advise that everyone understands the meaning of the following displays and icons before reading the "Safety precautions" and text.
Meaning of displays
Display
Meaning
Ignoring or disregarding this display may result in serious injury or lead to life-threatening situations. WARNING
Ignoring or disregarding this display may lead to personal injury or severe damage to the instrument or facilities. PRECAUTIONS ● Potential injury includes wounds, burns, electric shocks, etc. ● Damage to facilities refers to extensive damage to buildings,
equipment and furniture.
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Lensmeter LM-8
Meaning of icons
Icons
Meaning This indicates Mandatory Action. Specific content is expressed with words or an image, located close to the icon. This icon indicates a Hazard Alert (Warning). Specific content is expressed with words or an image, located close to the icon. This indicates Prohibition. Specific content is expressed with words or an image, located close to the icon.
Safety precautions This instruction manual specifies safety precautions necessary to prevent accidents. Always observe these precautions and use the instrument correctly.
CAUTION Icons
Prevention item
● To prevent your fingers getting caught, be particularly
careful when changing the tilt angle of the machine.
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● To prevent the machine/component parts from falling
over operate the machine with care when changing the tilt angle.
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Introduction
Operation and maintenance Purpose This Lensmeter is a piece of precision electrical equipment for medical use, which must be used according to a doctor’s instructions.
User maintenance To ensure the safety and performance of the instrument, unless otherwise specified in this manual, the maintenance should only be carried out by a trained service technician. The following maintenance tasks, however, can be performed by the user. We refer you to the applicable text in this manual, with regard to the maintenance method. Target position adjustment
For details, we refer you to the applicable text in this manual (page 29).
TOPCON instruments general statements
● TOPCON shall not take any responsibility for damage due to fire,
earthquakes, actions by third persons and other accidents, or the negligence and misuse by the user or use under unusual conditions. ● TOPCON shall not take any responsibility for damage resulting from the inability to use this equipment, such as a loss of business profit and suspension of business. ● TOPCON shall not take any responsibility for damage caused by operations other than those described in this Instruction Manual. ● The diagnoses that are made are the responsibility of relevant doctors, and TOPCON shall not take any responsibility for the results of such diagnoses.
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Lensmeter LM-8
Warning indications and positions To ensure safe operation of this equipment, warning indications are provided. Adhere to the following warning instructions.
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Contents
INTRODUCTION Precautions
iv
Selecting externally connected equipment... iv
Displays for safe use Meaning of displays...
v
Safety precautions
vi
Operation and maintenance
vii
Purpose... User maintenance...
1
v
vii vii
TOPCON instruments general statements
vii
Warning indications and positions
viii
COMPONENTS 1.1
Main Body
11
1.2
Target image
13
1.3
Accessories
14
2
BASIC OPERATION 2.1
Preparations
15
2.2
Measurement
17
Lensmeter LM-8
2.2.1
Measurement of spherical lens... 17
2.2.2
Measurement of astigmatic lens... 18
2.2.3
Measurement of framed astigmatic lens... 18
2.2.4
Measurement of contact lens... 19
2.2.5
Measurement of prismatic lens... 20
2.2.6
Axis marking (Cartridge specification/Steel needle specification)... 21
3
OPTIONAL ACCESSORIES 3.1
4
x
23
MAINTENANCE AND CHECKS 4.1
Daily care
27
4.2
Replacement of Marking Ink Cartridge
28
4.3
Refilling of ink for steel needle (optional)
29
4.4
Check and adjust
29
4.5
List of expendables and spare parts
31
4.6
Contacting TOPCON
31
5
6
Prism compensator
TROUBLESHOOTING 5.1
Before requesting service
33
5.2
Troubleshooting table
34
SPECIFICATIONS
35
1
COMPONENTS
1.1 Main Body
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(1)
(9)
(13)
(10)
(14)
(11)
(12)
(1)
Power switch
(2)
Eyepiece adjustment ring
(3)
Protractor ring
Lensmeter LM-8
(4)
Prism holder
(5)
Lens holder
(6)
Lens stop
(7)
Lens table
(8)
Axis wheel
(9)
Lens-holder lever
(10)
Axis marker lever
(11)
Lens table adjustment lever
(12)
Cell box
(13)
Diopter power knob
(14)
Tilt locking-lever
LM-8E (diopter power knob with scale)
LM-8C (without axis wheel)
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Components
1.2 Target image Cross-line Pinhole Corona Pinhole corona
Cross-line
Diopter scale-reading window
Pinhole Corona (LM-8C)
Scale
Cross-line Pinhole Corona Cross-line
LM-8E Diopter power is indicated on the scale of the Diopter Power knob.
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Lensmeter LM-8
1.3 Accessories Accessories
(A)
(B)
(C) (E)
(D)
Description
14
Quantity
Contact lens stop (A)
1
Silicon cloth (B)
1
Dust cover (C)
1
UM1 dry cell (D)
2
Lens protection pad (E)
1 set
Steel needle marking set (3 steel needles, refill ink, ink pad, holder) (optional accessory)
1 set
2
BASIC OPERATION
2.1 Preparations 1 Check component parts of the machine. Remove the adhesive tape from the lens stop. Remove the adhesive tape from the marking ink cartridge. 2 Put dry cells in the cell box. Turn on the power switch; the lamp will come on. The lamp will go off automatically after 5 minutes to save cell power.
Note:
When removing dry cells, remove the (+) side first. If the spring on the (-) side jumps out, push it back into position.
When using an AC adapter (sold on the market), insert power connector as illustrated below, and then turn on the power switch. In this case, the light stays on (even after 5 minutes).
Lensmeter LM-8
With regard to the AC adapter, either purchase one yourself or ask your dealer to get one for you.
AC adapter specification For Europe, products are designed to comply with the CE standard.
Output: 6V, 100mA and higher
9 mm or longer
3 To enable measurements in a comfortable position, adjust the tilt angle of the machine by operating the tilt locking lever. 4 Before starting measurement, correctly focus the target (otherwise an incorrect measurement result will occur). Before setting the lens, rotate the eyepiece adjustment ring and stop it at the point where the scale is clearly visible. Placing a white paper at the lens stop makes it easier to read the scale.
Note:
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To avoid visual error in adjustment, rotate clockwise.
Basic operation
2.2 Measurement 2.2.1
Measurement of spherical lens 1 Place the concave surface of the lens on the lens stop and fix it firmly with the lens holder. 2 Focus the target correctly by rotating the diopter power knob. Note: To avoid visual error during adjustment, adjust in the (+) -> (-) direction.
3 Read the indicator value on the diopter power scale. Note: If the scale center does not align with the target image center, this means that optical center of the lens is not in proper alignment with the optical axis of the lens-meter. Vertical displacement can be adjusted by pushing the lens towards the lens table by operating the lens table adjustment lever, and horizontal displacement can be adjusted by manually moving the lens laterally.
INSTRUCTION MANUAL
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Lensmeter LM-8
2.2.2
Measurement of astigmatic lens 1 Focus the pinhole corona section of the target by rotating the diopter power knob. 2 Align the cross-line with the stronger meridian by rotating the axis wheel (not applicable to LM-8C). Note: LM-8C Align the scale with the stronger meridian by rotating the protractor ring.
Meridian direction
3 Read the diopter power scale and the angle for the meridian direction. 4 Focus the target for the other meridian by rotating the diopter power knob.
Meridian direction
5 Read both the diopter power scale and the angle. Of these 2 measurement values, take the absolute value of the smaller one as being the S (spherical) power, and the difference between these two as the C (cylindrical) power. For the axial angle, take the angle of the measurement value, the absolute value of which will be the larger value.
2.2.3
Measurement of framed astigmatic lens 1 Place the glasses on the lens table. 2 Press the frame toward the lens table and align the lens with the optical axis.
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Basic operation
The refractive power can be determined in the same way, however you must set the focus to the stronger refractive power for the direction of the astigmatic axis. Focus the target along the stronger meridian. Align the cross-line with the stronger meridian by rotating the axis wheel. The angle of the indicator ∆ is the astigmatic axis.
Note:
LM-8C Align the scale with the stronger meridian by rotating the protractor ring.
2.2.4
Measurement of contact lens
● To prevent your fingers getting caught, be particularly careful when
changing the tilt angle of the machine. PRECAUTIONS
● To prevent the machine/component parts from falling over operate
the machine with care when changing the tilt angle. PRECAUTIONS
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Lensmeter LM-8
1 Remove the lens stop and tilt the lens-meter so that it is in the upright position. 2 Replace the contact lens stop and put the contact lens on it.
Note:
The contact lens stop can be stored in the dry cell box.
2.2.5
Measurement of prismatic lens Non-astigmatic lens 1 Place the prismatic lens against the lens stop and set the diopter power scale to zero. The target image is moved from the scale center. With regard to cross-line pinhole corona
2 Rotate the protractor ring and adjust the longer target center line so that it passes through the scale center (not applicable to LM-8C). In this case, the reading indicates the direction of the base. When the reading is 2∆, the direction is 30°.
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