Zu Produktinformationen springen
1 von 10

PayPal, credit cards. Download editable-PDF and invoice in 1 second!

GB/T 40230.1-2021 English PDF (GBT40230.1-2021)

GB/T 40230.1-2021 English PDF (GBT40230.1-2021)

Normaler Preis $230.00 USD
Normaler Preis Verkaufspreis $230.00 USD
Sale Ausverkauft
Versand wird beim Checkout berechnet
Delivery: 3 seconds. Download true-PDF + Invoice.
Get QUOTATION in 1-minute: Click GB/T 40230.1-2021
Historical versions: GB/T 40230.1-2021
Preview True-PDF (Reload/Scroll if blank)

GB/T 40230.1-2021: Methods of visual fatigue test and evaluation - Part 1: Ophthalmology and optometry
GB/T 40230.1-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.180
CCS A 25
Methods of Visual Fatigue Test and Evaluation - Part 1:
Ophthalmology and Optometry
ISSUED ON: MAY 21, 2021
IMPLEMENTED ON: DECEMBER 1, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3 
Introduction ... 4 
1 Scope ... 6 
2 Normative References ... 6 
3 Terms and Definitions ... 6 
4 Overall Requirements ... 9 
4.1 Principles ... 9 
4.2 Test Environment ... 9 
4.3 Requirements for Subject Selection ... 9 
4.4 Requirements for Experimenter Qualification ... 10 
4.5 Requirements for Instruments and Equipment ... 10 
4.6 Requirements for Experimental Data Record ... 10 
4.7 Requirements for Experimental Data Report ... 10 
5 Test Method ... 10 
5.1 Accommodative Response ... 10 
5.2 Accommodative Microfluctuations ... 12 
5.3 Near Point of Accommodation ... 13 
5.4 CA / C Ratio ... 14 
5.5 AC /A Ratio ... 15 
5.6 Tear Film Break-up Time ... 16 
Appendix A (normative) Documentation Requirements for Test Result Report ... 17 
Bibliography ... 18 
Methods of Visual Fatigue Test and Evaluation - Part 1:
Ophthalmology and Optometry
1 Scope
This document specifies the test methods and technical requirements for ophthalmology and
optometry of visual fatigue.
This document is applicable to the test and evaluation of visual fatigue caused by the long-term
application of visual display terminal products or lighting products in various places of work
and life, etc.
This document is not applicable to the measurement of photo-biological safety effects on human
beings brought by display or lighting products.
2 Normative References
Through the normative references in this text, the contents of the following documents
constitute indispensable clauses of this document. 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.
This document does not have normative references.
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Visual Fatigue
Visual fatigue refers to symptoms of discomfort when working with eyes for a long time.
NOTE: the symptoms of visual fatigue include blurred vision, headache, dry eyes and diplopia, etc.
3.2 Refraction
In optometry, when light passes from one medium to another medium with a different refractive
index, a change of direction will occur.
NOTE: the unit for measuring the size of refraction is diopter (represented by the symbol D and
expressed in m1).
3.3 Accommodation
Accommodation refers to the ability of the human eye to change the ocular refraction in order
to clearly see close objects.
3.4 Experimenter; Observer
Experimenter / observer refers to the personnel in charge of the progress of the experiment
during the experiment.
NOTE: the task of the experimenter / observer is to give instructions to the test subjects in
accordance with the experimental design and guide them to perform experimental
procedures in the experiment.
3.5 Subject; Participant
Subject / participant refers to the personnel participating in the experimental process or
receiving the experiment during the experiment.
NOTE: subject / participant is also known as receiver or tester.
3.6 Accommodative Response
Accommodative response refers to the actual amount of accommodation generated by the
stimulation of the fixating eye to the near-fixed optotype.
3.7 Rapid Serial Visual Presentation; RSVP
Rapid serial visual presentation refers to a visual graphic presentation method that rapidly
displays a string of character streams, a string of word (sentence) streams or a picture stream at
the same position on the screen in chronological order.
3.8 Accommodative Stimulus
Accommodative stimulus refers to the amount of accommodation required by the eye to see
objects at a specific distance.
NOTE: the unit is diopter.
3.9 Lag of Accommodation
Lag of accommodation refers to the situation that the amount of accommodative response is
less than the amount of accommodative stimulus.
3.10 Accommodative Microfluctuations
When the eye is fixed on a stationary object, its accommodation is not fixed, and there are
constant micro changes around the average accommodative response.
on the same optotype.
3.17 Tear Film
Tear film refers to a layer of tear fluid that covers the surface of the cornea and conjunctiva
between the upper and lower eyelids.
3.18 Tear Film Break-up Time
Tear film break-up time refers to the time when the tear film firstly breaks up without blinking.
4 Overall Requirements
4.1 Principles
Considering the constraints in the actual measurement, the principles of the measurement
methods involved in this document are mainly direct observation method, minimum change
method and adaptive method of psychophysics.
4.2 Test Environment
Temperature: 15 C ~ 30 C, preferably 23 C ~ 28 C.
Humidity: 25% ~ 75%.
Noise: the background noise should be within 25 dB ~ 45 dB.
Illumination: the initial ambient illumination shall be 0 lx; the ambient illumination conditions
should be set to be adjustable, and satisfy the environmental conditions required for most
equipment test. The specific illumination setting shall be set in accordance with the test
equipment and the purpose and task of the experiment.
4.3 Requirements for Subject Selection
Basic requirements: people with normal or corrected-to-normal vision, and without eye diseases
shall be recruited as the subjects.
The subjects shall have a clear and unmistakable understanding of the task to be completed
during the test.
Different test equipment and test contents may have different requirements for the subjects. For
the requirements related to test methods and equipment, see the section of each test method.
The selection basis, sample size, sample selection method, history of eye disease and history of
brain disease of the subjects shall be recorded and archived. The archival date shall be based on
the retention time of the original data by the laboratory.
4.4 Requirements for Experimenter Qualification
Persons with a background in ophthalmology or optometry, or those engaged in optics, visual
sciences, psychology, sociology and biology and other related fields, and have been trained
shall be selected as the experimenters.
4.5 Requirements for Instruments and Equipment
The instruments and equipment shall comply with the precision requirements.
4.6 Requirements for Experimental Data Record
The experimental data records shall be complete and clear, and shall include the necessary basic
information of the subjects, such as: age, gender, history of eye disease, and whether they have
mental or brain diseases, etc.
The retention and destruction of test data shall be carried out in accordance with relevant rules
and regulations.
4.7 Requirements for Experimental Data Report
Data in the result presentation shall be rounded to two decimal places.
The data result report shall describe in detail the test subjects, test tools and test procedures,
etc., and shall comply with the requirements of Appendix A.
5 Test Method
5.1 Accommodativ...
Vollständige Details anzeigen