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GB 45184-2024: Optometry products - Safety technical specifications of components
---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/GB45184-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 11.040.70
CCS Y 89
Optometry products - Safety technical specifications of
components
Issued on: DECEMBER 31, 2024
Implemented on: JANUARY 01, 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... 9
4.1 General... 9
4.2 Optical properties... 9
4.3 Transmission performance... 11
4.4 Lens strength... 14
4.5 Sweat-resistance of frames... 14
4.6 Mechanical stability of frames... 15
4.7 Nickel release... 16
5 Test methods... 16
5.1 Test conditions... 16
5.2 Optical properties... 16
5.3 Transmission performance... 23
5.4 Lens strength... 27
5.5 Sweat-resistance of frames... 29
5.6 Mechanical stability of frames... 30
5.7 Nickel release... 32
Appendix A (Informative) Schematic diagram of the test device for sweat-resistance of
spectacle frames... 33
Optometry products - Safety technical specifications of
components
1 Scope
This document defines the terms and definitions of optometry product components,
specifies safety technical requirements, and describes the corresponding test methods.
This document applies to components of optometry products.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 26397, Ophthalmic optics - Terminology
GB/T 38009, Spectacle frames - Requirement and method for the detection of
nickel release
ISO 13666, Ophthalmic optics - Spectacle lenses - Vocabulary
3 Terms and definitions
For the purposes of this document, the following terms and definitions, as well as those
given in GB/T 26397 and ISO 13666, apply.
3.1
finished spectacles
Various types of glasses that can be used directly.
Note. Types generally refer to ordinary spectacles, partially enclosed or fully
enclosed eye masks, flip-up or detachable additional lenses, etc. Common
finished spectacles include custom-made glasses, presbyopia glasses,
sunglare filters, swimming goggles, glasses for alpine snow use, special
glasses for motor vehicle driving, polarized three-dimensional glasses, etc.
Sunglare filter with a nominal vertex power of zero.
4 Safety technical requirements
4.1 General
The refractive performance of lens shall be measured using a focimeter or equivalent
method. The optical parameters of the lens shall be measured at the reference points. If
the manufacturer explicitly states that the vertex power value of the wearing position
will be corrected, it shall be tested against the calibration vertex power, and the
corresponding calibration vertex power deviation shall comply with the provisions of
Tables 1 ~ 5.The manufacturer's declared calibration vertex power for the wearing
position shall be indicated on the packaging or attachments.
4.2 Optical properties
4.2.1 Vertex power
4.2.1.1 Measure according to the method described in 5.2.1.The deviation of the vertex
power of each principal meridian plane of the lens and the deviation of vertex power of
the cylindrical lens shall comply with the requirements of Table 1 or Table 2.
upper and lower limits of the classification; for categories 3 and 4, there shall
be no overlap.
-- If the manufacturer marks the visible light transmittance value, for categories
0 ~ 3, the absolute deviation of the visible light transmittance shall not exceed
±3%; for category 4, the relative deviation of the visible light transmittance
shall not exceed ±30%.
4.3.2 Visible light transmittance uniformity
Measured according to the method described in 5.3.4, the visible light transmittance
uniformity (ΔF) of the plano sunglare filter shall comply with.
-- Category 0 ~ 3 lenses. ΔF ≤10%;
-- Category 4 lenses. ΔF ≤20%.
The visible light transmittance uniformity (ΔP) of unmounted binocular plano sunglare
filter shall not be greater than 15%.
Note. Not including changes in visible light transmittance due to thickness
variations in lens design.
4.3.3 Scattered light
Measured according to the method described in 5.3.5, the haze value of plano sunglare
filter shall not be greater than 3%.
4.3.4 Applicable requirements for walking and driving
4.3.4.1 Daytime driving
Measured according to the method described in 5.3.2, the visible light transmittance τV
of the lens shall not be less than 8%.
4.3.4.2 Driving at dawn, dusk and night
Measured according to the method described in 5.3.2, the visible light transmittance τV
of the lens shall not be less than 75%.
4.3.4.3 Spectral transmittance
Measured according to the method described in 5.3.2, the spectral transmittance of the
lens, within the range of 475 nm ~ 650 nm, shall not be less than 0.2 τV.
4.3.4.4 Traffic light identification
Measured according to the method described in 5.3.2, the relative visual attenuation
factor (Q) of the lens shall comply with the following requirements.
4.7 Nickel release
For metal frames and metal parts of hybrid frames that are in direct contact with the
wearer's skin for a long time, the nickel release shall not be greater than 0.5
μg/(cm2·week) when tested according to the method described in 5.7.
Parts to be tested include.
a) lens ring;
b) nose bridge, crossbar, and other nose-supporting surfaces, including metal
nose pads;
c) temples (excluding the hinges, the area around the hinges and the area
protected by the plastic sleeve).
5 Test methods
5.1 Test conditions
The test environment temperature is 23 ℃ ± 5 ℃.
5.2 Optical properties
5.2.1 Vertex power
5.2.1.1 Lens
Place the back surface of the lens on the focimeter holder and center it; measure at the
reference point of the lens.
5.2.1.2 Plano sunglare filter
5.2.1.2.1 General
Measure using the finite telescope method. Or use other equivalent measurement
methods, such as focimeter, etc.
If there is a discrepancy between the measurement results of the finite telescope method
and those of the focimeter, the finite telescope method shall prevail.
5.2.1.2.2 Finite telescope method
5.2.1.2.2.1 Test apparatus
The test apparatus for the finite telescope method is shown in Figure 2.
-- For multifocal lenses, determine the horizontal reference line as described in
5.2.2.2 and measure the horizontal and vertical components at the distance
reference point.
5.2.4.2 Power-variation lens
Align the prism reference point of the lens; use the permanent mounting reference
provided by the manufacturer to determine the horizontal reference line; measure the
horizontal and vertical prismatic power. The measurement can also be performed using
a prism compensation device that is in the opposite direction to the base of the prismatic
power being measured.
5.2.4.3 Plano sunglare filter
5.2.4.3.1 General
Measure using the finite telescope method. Or use other equivalent measurement
methods, such as focimeter, etc.
If there is a discrepancy between the measurement results of the finite telescope method
and those of the focimeter, the finite telescope method shall prevail.
5.2.4.3.2 Finite telescope method
Place the sample as described in 5.2.1.2.4.2 and observe through the telescope the
relative position of the crosshairs in the eyepiece on the standard measuring plate. If the
crosshairs fall on the outer edge of the large circle, the prismatic power is equal to 0.25
cm/m; if the crosshairs fall on the inner edge of the small circle, the prismatic power is
equal to 0.12 cm/m.
5.3 Transmission performance
5.3.1 Sample
Samples shall be carefully cleaned before measurement. Because lenses usually have
vertex power, when using transmittance measuring equipment such as spectrometers,
attention shall be paid to the possible impact of changes in lens thickness on the
measurement results.
5.3.2 Visible light transmittance τV and relative visual attenuation factor Q value
When measuring the visible light transmittance τV, the spectral distribution function of
the standard light source D65 and the spectral luminous efficiency function under
daylight shall be used for calculation. The wavelength sampling interval of the spectral
transmittance shall not be greater than 5 nm. Linear interpolation is allowed for
wavelengths less than 5 nm.
5.4.2.2 Adjustment
There is a cylindrical groove in the steel structure support. Place a piece of white paper
on the flat bottom of the groove and cover it with a piece of carbon paper; adjust the
position of the white paper and the carbon paper to be 1.5 mm below the plane where
the rubber ring contacts the rear surface of the sample and parallel to this contact surface
(assuming the contact surface is flat).
If the rear surface of the sample is not rotationally symmetrical, the position of the white
paper and the carbon paper shall be 1.5 mm lower than the lowest point of contact
between the rubber ring and the rear surface of the sample.
5.4.2.3 Load application
Apply a load to the sample at a rate of 350 mm/min ± 50 mm/min; maintain a pressure
of 100 N ± 2 N for 10 s ± 2 s; then release the load.
5.4.2.4 Sample inspection
Remove the lens and observe its condition.
5.5 Sweat-resistance of frames
5.5.1 Apparatus and reagents
5.5.1.1 Heating box. capable of providing a test temperature of 55 °C ± 5 °C.
5.5.1.2 Container. glass or inert plastic, at least 200 mm wide and 90 mm high, capable
of being closed.
5.5.1.3 Volumetric flask. 1 L, measurement grade A.
5.5.1.4 Water. conform to the requirements for Grade III water in GB/T 6682.
5.5.1.5 Artificial sweat contains the following ingredients.
a) Lactic acid. ρ = 1.21 g/mL, purity > 85%;
b) Sodium chloride. analytical grade ≥99%;
c) Water (5.5.1.4).
Weigh 50.0 g ± 0.1 g of lactic acid and 100.0 g ± 0.1 g of sodium chloride; dissolve
them in 900 mL of water; then use a volumetric flask to prepare 1 L of solution.
5.5.1.6 Sample holder. Glass or inert plastic, placed in the container to support the
sample and keep it above the artificial sweat. See Figure A.1 in Appendix A. The holder
can be designed to allow multiple samples to be stacked or placed side by side, but the
samples shall not touch each other.
5.5.2 Procedures
5.5.2.1 Add artificial sweat to a depth of at least 10 mm into the container. The lowest
point of the sample (including when layered) must be at least 12 mm from the liquid
surface.
5.5.2.2 Place the sample on the holder, with the temples naturally open (the spring
holders are opened to the maximum position where no external force is applied to the
spring device). Place the lower edges of the temples on the holder, ensuring that there
is no contact between the samples or between the samples and the container wall.
5.5.2.3 Close the container and place it in a heating cabinet, maintaining the temperature
at 55 ℃ ± 5 ℃.
5.5.2.4 After standing for 8.0 h ± 0.5 h, remove the sample and immediately rinse with
water; then use a soft cloth without friction to dry it. Within 0.5 h, examine each sample
without the aid of a magnifying glass and record any corrosion spots or color changes
by comparing it with a pair of samples that have not been subjected to this test.
5.5.2.5 Place the sample back into the container; close the container; maintain the
temperature at 55 °C ± 5 °C for 16.0 h ± 0.5 h. After completing the second test phase,
remove the samples; immediately rinse with water and dry the samples; then inspect
the areas of each sample that are likely to come into contact with the wearer's skin for
extended periods of time; record any corrosion, surface discoloration, or coating
shedding.
5.6 Mechanical stability of frames
5.6.1 Device
The test device mainly consists of two parts. a ring clamp and a pressure rod, including
a linear measuring tool with a minimum graduation value of no more than 0.1 mm. The
ring clamp can fix the frame without twisting or slipping. The diameter of the clamp is
25 mm ± 2 mm, and its two contact surfaces (E1 and E2) are made of elastic material
(such as nylon). The diameter of the pressure rod is 10 mm ± 1 mm, and it can move at
least 10 mm upward and at least 8 mm downward. The contact surface is approximately
hemispherical, as shown in Figure 9.The distance between the clamp and the pressure
rod shall be adjustable to ensure that the pressure rod acts on the axial direction of the
center position of the clamped lens.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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