This standard specifies the basic requirements for trial frames for mounting trial lenses. This standard applies to all types of trial frames for headband mounting, bracket mounting, and eyeglass frames with temples and nose pads. GB 18143-2000 Ophthalmic instrument trial frames GB18143-2000 Standard download decompression password: www.bzxz.net

GB 18143--2000
This standard refers to the content of ISO12867:1998 "Ophthalmic Instruments-Trial Frames".
This standard is a mandatory standard. 4.2.6, 4.2.8, 4.2.9 are mandatory clauses, and the rest are recommended clauses. This standard is proposed by the China National Institute of Metrology and GB17342-1998 "Ophthalmic Instruments-Trial Frames". This standard is used in conjunction with "Ophthalmic Lenses".
This standard is drafted by the China National Institute of Metrology. The main drafters of this standard are: Wang Liru and Ma Zhenya. This standard was first issued in July 2000.
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1 Scope
National Standard of the People's Republic of China
Trial frameswwW.bzxz.Net
Ophthalmic instrument
Ophthalmic instrument-Trial frames This standard specifies the basic requirements for trial frames for mounting trial lenses. GB18143—2000
This standard applies to various trial frames of the type of headband mounting, bracket mounting, and eyeglass frames with temples and nose pads. 2 Referenced standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. The versions shown are valid at the time of publication of this standard. All standards are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB17342---1998 Trial lenses
GB/T28281987 Batch inspection counting sampling procedures and sampling tables (applicable to the inspection of continuous batches)GB/T13464-1995 General technical conditions for instrument packaging 3 Definitions
This standard adopts the following definitions.
3.1 Trial frames
It consists of two connected lens holders, which can position the trial lenses in front of the eyes of the testee as required. 3.2 Reduced aperture trial frames reducedaperture trial frames Trial frames used to install reduced aperture trial lenses. 3.3 Full aperture trial frames full aperture trial frames can be used to install both reduced aperture trial lenses and full aperture trial lenses. 3.4 Half-eye trial frames can be used to fit reduced-aperture and full-aperture trial lenses, and have a fan-shaped lens holder at the bottom. 3.5 Lens holders can be used to fit several trial lenses and position them in front of the eyes of the testee. 3.6 Bridgepieces support the trial frames and contact the bridge of the testee's nose. 3.7 Sides can be hooked on the testee's auricle to keep the frames in contact with the cheek. 4 Requirements
4.1 General
All types of trial frames shall comply with the requirements of 4.2~4.4 and be inspected according to the methods of 5.1~5.5. 4.2 Mechanical requirements
4.2.1 Frames
Approved by the State Administration of Quality and Technical Supervision on July 24, 2000 TTKANIKAca-
Implementation on April 1, 2001
GB 18143—2000
Trial frames shall have the function of adjusting the relative position of the two frames located in front of the eyes of the testee. Each frame shall be able to install at least three lenses at the same time and have a separation space on the axis of the frame. 4.2.2 Sickle spacing
The relative position of the center of the vertebra shall be adjustable so that the geometric center distance of the trial lens is consistent with the pupil distance. 4.2.3 Rotating lens
The lens should be able to rotate 180° around the optical axis in the frame. 4.2:4 Temple
The two temples should be perpendicular to the plane of the trial lens. 4.2+5 Different support
The nose support should ensure that the vertex distance of the lens is adjustable and the geometric center of the lens can be raised or lowered along the line connecting the pupil distance. 4.2.6 Axis scale
The inner edge of the frame of the trial frame should be marked with scales for the axis of the cylinder and the base of the prism, with a scale range of 0° to 180°. The scale value should increase counterclockwise along the axis of the frame, and the scale interval should not exceed 5°. 4.2.7 Frame calibration
The non-parallelism of the geometric axes of the two frames should not exceed 2°. The difference between the equal heights of the two frames should not exceed 5mm. 4.2.8 Dimensions and tolerances
See Table 1 for dimensions and tolerances.
Table 1 Range and minimum aperture
Sleeping hole spacing range
Minimum aperture
Minimum rotation range of sugar tablet
Note: This does not include the spacing of the holes for children's trial glasses. Full-filled and reduced aperture
55 mm--75 mm
59mm--87mm
After the lens is installed in the glasses, the non-parallelism between the geometric axis of the frame and the optical axis of the lens should not exceed 2.5°, and the non-concentricity should not exceed 0.5mm; the lateral or axial displacement of the lens relative to the geometric center of the lens ring should not exceed 0.3mm. 4.2.9 Structure
The surface of the trial glasses frame should be smooth and should not have any sharp corners and sharp edges that may cause harm to the person being tested. 4.3 Materials
The trial glasses frame is the part that directly contacts the skin of the person being tested. It is strictly prohibited to use toxic substances or materials that can directly cause skin allergic reactions:
The materials used to make the trial glasses frame are not allowed to contain any corrosive components. If the surface is treated, it should be ensured that it will not corrode or fade at room temperature.
4.4 Environment
Use at room temperature.
5 Inspection method
5.1 Inspection of mechanical requirements
The internal wear involved in 4.2.1~4.2.6 and 4.2.9 of this standard is carried out by visual inspection and hand feeling. 5.2 Inspection of parallelism of geometric axes of the frame
The inspection of parallelism of geometric axes of the frame can be carried out by the self-collimator method, and refer to Figure 1. 640
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GB 18143—2000
Autocollimation
Figure 1 Schematic diagram of autocollimation measurement
Trial lens
Fix the trial lens frame securely on the workbench, and place a reflector (M) on the surface of the two frames of the trial lens frame in turn. Place an autocollimator with a measurement accuracy of not less than ±0.5° in front of the trial lens frame. Move the autocollimator horizontally in the direction perpendicular to the geometric axis of the frame, read the reflected images of the two reflectors respectively, and obtain the displacement deviation between them. After converting the displacement deviation into an angle, the non-parallelism deviation of the geometric axes of the two frames is obtained, and its value should comply with the provisions of 4.2.7. 5.3 Inspection of plane equal height and difference between frames Use a special component to inspect the plane equal height difference between the two frames. The component is made of a disk (A) with a connecting rod arm (see Figure 1).
Place the disk on the workbench and place the trial frame flat on the disk. Select two lenses of the same thickness and insert them into the trial frame, and make one of the lenses contact the connecting rod plane of the disk. Use a vernier caliper with a graduation value of not less than U.1mm to measure the distance from the bottom surface of the single disk to the upper surface of the two lenses respectively. The difference between the two measured values ​​is the plane equal height difference between the frames, and its value should comply with the provisions of 4.2.7. 5.4 The range of medullary hole spacing and aperture size should be inspected using a vernier caliper with a graduation value of not less than 0.1mm. Its value should comply with the provisions of Table 1 in 4.2.8. 5.5 Conformity inspection of lens installation
Select a suitable lens and install it in the frame. Use a vernier caliper with a graduation value of not less than 0.1mm to inspect the diameter deviation and lateral and axial displacement in 4.2.8 respectively. Its value should comply with the provisions of 4.2.8. 6 Inspection rules
6.1 The factory products shall be inspected item by item according to the requirements of this standard. If any item fails, it shall be judged as unqualified.
6.2 The batch products of the factory shall be inspected according to the general inspection level 1 of GB/T2828: normal sampling. The qualified quality level (AQL) is specified in Table 2.
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Test serial number
Inspection items
Axis scale
Dimensions and specifications
GB 18143—2000
Smoothness of structural surface, etc.
Pitch of medullary holes
Rotation range
Non-parallelism of geometrical axis, mutual difference of equal height of plane, etc. 6.3 For products with special requirements, another agreement can be made according to the requirements of both supply and demand parties. 7 Marking, packaging, transportation, storage
7.1 Marking and packaging
7. 1. 1 Trial glasses frames should have packaging boxes.
7.1-2 The following information should be marked on the packaging box; a) the name and address of the manufacturer:
b) the brand and type of the trial frame;
c) the factory number.
7.1.3 The following relevant information should be included in the packaging box: a) instructions for use of the trial frame;
standard terms
b) effective disinfection methods for the trial frame, and instructions for returning the trial frame to the manufacturer for repair or maintenance; c) the code of the implementation standard.
7.2 The outer packaging of the trial frame should comply with the provisions of GB/T 15464. 7.3 During transportation, it should be placed and unloaded with care to avoid collision, rain and moisture. 7.4 During storage, it should be ventilated and dry to prevent moisture. 642
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