GB 45185-2024 PDF English
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Optometry products - Safety technical specifications of finished spectacles
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GB 45185-2024: Optometry products - Safety technical specifications of finished spectacles---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB45185-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 11.040.70
CCS Y 89
Optometry Products - Safety Technical Specifications of
Finished Spectacles
Issued on: DECEMBER 31, 2024
Implemented on: JANUARY 1, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Safety Technical Requirements... 6
4.1 General... 6
4.2 Vertex Power... 6
4.3 Axial Direction of Cylindrical Lens... 8
4.4 Centration Point Position... 8
4.5 Transmission Performance... 10
5 Test Method... 12
5.1 Test Conditions... 12
5.2 Vertex Power... 13
5.3 Axial Direction of Cylindrical Lens... 15
5.4 Centration Point Position... 15
5.5 Transmission Performance... 16
Appendix A (normative) Weighting Function for Calculating Relative Visual
Attenuation Factor (incandescent signal lights)... 18
Optometry Products - Safety Technical Specifications of
Finished Spectacles
1 Scope
This document defines the terms and definitions of finished spectacles as optometry products,
specifies the safety technical requirements, and describes the corresponding test methods.
This document applies to finished spectacles as optometry products.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 26397 Ophthalmic Optics - Terminology
GB/T 39552.2-2020 Sunglasses and Sunglare Filters - Part 2.Test Methods
GB 45184 Optometry Products - Safety Technical Specifications of Components
ISO 13666 Ophthalmic Optics - Spectacle Lenses - Vocabulary
3 Terms and Definitions
The terms and definitions defined in GB/T 26397, GB 45184 and ISO 13666, and the following
are applicable to this document.
3.1 finished spectacle
All types of spectacles ready for immediate use.
NOTE. the types generally refer to common spectacles, partially or fully enclosed eye masks,
reversible or removable attachment lenses, etc. Common finished spectacles include
prescription assembled spectacles, near-vision spectacles, sunglasses, swimming goggles,
mountain and snowfield goggles, specialized spectacles for motor vehicle drivers,
polarized 3D spectacles, etc.
3.2 assembled spectacle
Finished spectacles assembled from lenses with vertex power and frames.
NOTE. assembled spectacles are categorized into prescription assembled spectacles and near-
vision spectacles.
3.3 prescription assembled spectacle
Assembled spectacles manufactured in accordance with a prescription processing form or
specific requirements.
3.4 near-vision spectacle
Mass-produced assembled spectacles primarily for near-vision use.
NOTE. they are generally categorized into single-focal near-vision spectacles, multi-focal near-
vision spectacles, and progressive-focal near-vision spectacles.
3.5 centration point
In the absence of prescription prism degree and thinned prisms, or when such prism effects are
negated, the point located at the optical center, distance reference point or fitting point, and
associated with the frame.
NOTE. generally, the centration point of a single-focal (except fixed-point single-focal) lens is
referred to as the optical center; the centration point of a multi-focal lens is referred to as
the distance reference point; the centration point of a fixed-point single-focal lens or
progressive-focal lens is referred to as the fitting point.
[source. ISO 13666.2019, 3.2.30, modified]
3.6 centration point distance; CD
centration point horizontal distance
The distance between the centration points of the two lenses in the horizontal direction.
NOTE 1.interpupillary distance, which refers to the distance between the geometric centers of the
pupils of two eyes, is usually abbreviated as PD.
NOTE 2.interpupillary distance is commonly used in industry to indicate the nominal value of the
horizontal distance between the centration points.
[source. ISO 13666.2019, 3.2.31, modified]
3.7 centration point horizontal distance of one-side
The distance between the centration point of a one-side lens and the vertical axis of symmetry
between the lens rings (enclosing-square method) in the horizontal direction.
NOTE 1.mono-pupillary distance is commonly used in industry to indicate the nominal value of
the one-side horizontal distance of the centration point.
If the manufacturer marks the luminous transmittance values, for Category SW0 ~ Category
SW3 lenses, the absolute deviation of the luminous transmittance shall not exceed 3%; for
Category SW4 lenses, the relative deviation of the luminous transmittance shall not exceed
30%.
4.5.2 Relative deviation of luminous transmittance
4.5.2.1 In accordance with the method described in 5.5.2, carry out the test. The relative
deviation of luminous transmittance between the left and right lenses of sunglasses with zero
diopter shall not exceed 15%.
4.5.2.2 In accordance with the method described in 5.5.2, carry out the test. The relative
deviation of luminous transmittance between the reference points of the left and right lenses of
swimming goggles shall not exceed 15%.
4.5.3 Traffic signal recognition
4.5.3.1 In accordance with the method described in 5.5.3, carry out the test. The relative visual
attenuation factor (Q) of sunglasses used for walking and driving shall meet the following
requirements.
---Red, Q 0.80;
---Yellow, Q 0.60;
---Green, Q 0.60;
---Blue, Q 0.60.
4.5.3.2 In accordance with the method described in 5.5.3, carry out the test. The relative visual
attenuation factor (Q) of finished spectacles (excluding sunglasses) used for walking and
driving shall meet the following requirements.
---Red, Q 0.80;
---Yellow, Q 0.60;
---Green, Q 0.60;
---Blue, Q 0.40.
5 Test Method
5.1 Test Conditions
The ambient temperature shall be 23 °C 5 °C.
5.2 Vertex Power
5.2.1 Finished spectacles
Place the lower edge of the finished spectacles against the reference backup plate of the
lensometer. Place one of the lenses with its posterior surface facing the support of the
lensometer and keep it centered. In accordance with the type of finished spectacles, measure at
the reference point on the lens. Repeat the above steps to measure the other lens of the finished
spectacles. If the manufacturer explicitly states that the vertex power is corrected for the
wearing position, then, take the corrected vertex power as a contrast for measurement. The
manufacturer’s stated corrected vertex power for the wearing position shall be indicated on the
packaging and accompanying documents.
5.2.2 Sunglasses with zero diopter
5.2.2.1 General
Measurements shall be conducted using the finite telescope method. Other equivalent
measurement methods, for example, the lensometer method, may also be used.
If the measurement results of the finite telescope method differ from those of the lensometer
method, the finite telescope method shall prevail.
5.2.2.2 Finite telescope method
5.2.2.2.1 Test device
See GB 45184 for the test device.
5.2.2.2.2 Test procedures
5.2.2.2.2.1 Adjustment of test device
See GB 45184 for the adjustment of the test device.
5.2.2.2.2.2 Measurement position
For samples with a designated wearing position, measurements shall be conducted at the
designated wearing position. For samples without a designated wearing position, measurements
shall be conducted using the following placement methods.
---Sunglasses with zero diopter and separated lenses. place the lens surface perpendicular
to the optical axis of the system and measure at measurement point C as specified in
Figure 1.
---Binocular sunglasses with zero diopter. place the lens surface perpendicular to the
optical axis of the system and measure at measurement point R as specified in Figure
2.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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