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YY 0477-2016 PDF in English

YY 0477-2016 (YY0477-2016) PDF English
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YY 0477-2016: PDF in English

YY 0477-2016
ICS 11.040.70
C 40
Replacing YY 0477-2004
Rigid gas permeable
contact lenses for orthokeratology
Issued by. China Food and Drug Administration
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Requirements ... 7 
5 Test methods ... 10 
6 Sampling and inspection rules ... 11 
7 Marks, labels and accompanying information ... 12 
8 Packaging ... 14 
Foreword, 4.7.1 of this Standard are recommendatory; the rest are mandatory.
This Standard was drafted in accordance with the rules given in GB/T
This Standard replaces YY 0477-2004 Rigid gas permeable contact lenses
for orthokeratology.
The main technical differences between this Standard and YY 0477-2004 are
as follows.
- added the purpose of use of Clause 1;
- modified Clause 3 Terms and definitions;
- added alignment curve zone (3.4), aide curve zone (3.5);
- supplemented the definition of complex reverse geometry design for
orthokeratology (3.6);
- deleted the classification requirements in Clause 4;
- deleted Table 1 Geometric parameter range values and tolerances and
Table 2 Optical parameters and tolerances of orthokeratology lenses in
Clause 5; directly referred to the requirements for gas permeable
materials in GB 11417.2-2012; deleted the requirements for stress, try
lenses, lens color;
- added general requirements, intake and release of preservatives,
radiation aging test, validity requirements, material requirements;
- transmissibility, physical properties of materials, chemical properties,
biocompatibility evaluation, microbiological requirements, impurities and
surface flaws, etc., refer to the requirements in GB 11417.2-2012;
- supplemented the requirements for design size, edge contour;
- deleted specific test methods; test methods referred to the test methods
specified in GB 11417.2-2012;
- supplemented a standard test method for infrared spectral analysis of
- added the contents of the information provided by the manufacturer to
the optometrists;
Rigid gas permeable
contact lenses for orthokeratology
1 Scope
This Standard specifies the terms and definitions, requirements, test methods,
sampling and inspection rules, marks, labels and accompanying data,
packaging for rigid gas permeable contact lenses for orthokeratology
(hereinafter referred to as orthokeratology lenses). Orthokeratology lenses
are expected to be used by temporarily altering corneal morphology in order
to achieve temporary correction of refractive errors.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including
any amendments) applies.
GB/T 2829, Sampling procedures and tables for periodic inspection by
attributes (Apply to inspection of process stability)
GB/T 11417.1-2012, Ophthalmic optics - Contact lenses - Part 1.
Vocabulary, classification system and recommendations for labeling
GB 11417.2-2012, Ophthalmic optics - Contact lenses - Part 2. Rigid
contact lenses specification
YY/T 0316, Medical devices - Application of risk management to medical
YY/T 0466.1, Medical devices - Symbols to be used with medical device
labels, labelling and information to be supplied - Part 1. General
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T
11417.1-2012 and the followings apply.
4.2.1 Rear vertex, cylinder power and cylindrical axis
The rear vertex and/or prescription cylinder mirror and cylinder axis nominal
values of orthokeratology lenses shall be marked on the small packaging
container’s label or in the accompanying technical documentation. Its
tolerance shall be consistent with the provisions of Table 1 in GB
4.2.2 Light transmission performance
The requirements for the visible light transmittance, color vision requirements
and UV transmittance of orthokeratology lenses shall comply with the
provisions of 4.2.4 in GB 11417.2-2012.
4.3 Geometric dimensions
4.3.1 Design size
The manufacturer shall provide the design pattern for orthokeratology lenses,
confirm the radius or vector height of base curve zone, total diameter, center
thickness, base curve zone diameter, reverse curve curvature radius and
diameter, alignment curve zone curvature radius and dimeter if applicable, or
geometric parameter design values of structure size of alignment curve zone.
The design values shall be marked according to the requirements for small
packaging container label or accompanying technical documentation. The
geometric parameters shall be marked according to the requirements in
Annex A of GB/T 11417.1-2012. It tolerance shall meet requirements for
permeable materials in Table 4 of GB 11417.2-2012. The structural dimension
tolerance of alignment curve zone shall be confirmed by the manufacturer.
4.3.2 Additional size
If applicable, the geometric size of micro-pore shall be marked on the small
packaging container’s label. The difference between the actual measured
value and the nominal value shall not exceed 10% of the nominal value.
4.4 Materials
4.4.1 Material description
The manufacturer shall indicate that the materials for orthokeratology lenses
shall be classified and marked according to the requirements of GB/T
11417.1-2012. Each manufacturer shall provide the names, contents of all
compositions of materials for orthokeratology lenses, the main chemical
molecular structure and characteristic peaks of testing IR spectra. Meanwhile,
it shall state the test methods and conditions. Carry out the test via infrared
spectrometer. The testing sample shall meet requirements for material The intake and release of preservatives (if applicable) shall comply
with the provisions of in GB 11417.2-2012.
4.5 Biocompatibility evaluation
The biocompatibility evaluation shall comply with the provisions of 4.5 in GB
4.6 Microbiological requirements
The microbiological requirements shall comply with the provisions of 4.6 in
GB 11417.2-2012.
4.7 Stability
4.7.1 The radiation aging test shall comply with the provisions of 4.7.1 in GB
4.7.2 The validity requirements shall comply with the provisions of 4.7.2 in
GB 11417.2-2017.
4.8 Intrinsic quality and surface defects
4.8.1 Impurities and surface flaws, microporous shall comply with the
provisions of 4.8.1, 4.8.2 in GB 11417.2-2017.
4.8.2 Edge contour. observe under the 7~10 times magnifier. The edges of
orthokeratology lenses shall be smooth, bright and clean. Its shape shall be
consistent with the quality characteristics described by the manufacturer. The
transition between the peripheral curves and the base curve zone shall be
smooth, bright and clean. The transition shall be uniform, consistent.
5 Test methods
5.1 For the requirements in Clause 4, except 5.2, the rest shall be detected
or tested according to the methods listed in Annex A of GB 11417.2-2012. If
Annex A of GB 11417.2-2012 does not have a suitable method, the
manufacturer shall provide an applicable method. The test or test method
provided shall consider as much as possible to simulate the practical
application of the human eyes, including the treatment (e.g., the balance in
the standard salt solution). The reproducibility of the detection method shall
be better than half of the specified tolerance limit.
5.2 Analysis test of infrared spectra of material composition. take the
finished product of orthokeratology lenses as testing sample. Use Fourier
transform infrared spectrometer to carry out the test. The characteristic peak
of the infrared spectrum of the test sample shall meet the main chemical
n) manufacturer’s name.
7.2 Accompanying information
NOTE. The manufacturer shall provide the instructions to the patient, the information to the
optometrists according to the following requirements.
7.2.1 Instructions for use provided by the manufacturer to the patient
The manufacturer shall require the fitting personnel to provide the instructions
to the patient.
In addition to the nominal value of the accompanying documentation provided
in Clause 5, the instructions for use shall include at least the following
a) main performance, structure and scope of application.
1) product name and model;
2) structure and principle of orthokeratology lenses;
3) material description;
4) main technical parameters;
5) physical properties of the lenses...
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.