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The principle and method of checking the driver's horizontal field of view at 15
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Release time：2024-04-02
The correct detection method for "monocular visual impairment, excellent naked vision or corrected visual acuity reaching logarithmic visual acuity chart 5.0 or above, and horizontal visual field reaching 150 degrees" in Order 139 of the Ministry of Public Security:
● Field of view when one eye (using the right eye as an example) is stationary:
The nasal field of view is generally around 60 ° (obstructed by the nasal bridge)
The temporal field of view is generally above 90 °
The upper field of view is generally around 50 °
The range of view below is generally around 70 °
● Range of monocular vision at different speeds during driving:
● Horizontal field of view inspection procedure that only checks one straight line: (not suitable for driver's medical examination)
Test method: Check only one straight line in the horizontal field of view.
Reasons not suitable for driver medical examination:
The field of view is a face, not a line.
Many eye disease patients have a normal visual field on the horizontal line, but visual field defects in other areas can seriously affect driving
●Example of application of vertical field of view:
Taking a sedan as an example, the driver's horizontal line of sight is about 1.2m above the ground, in accordance with the national standard (GB14886-2006 Road Traffic Signal)
According to Article 7.10.4 of the Specification for Setting and Installing Traffic Lights, the height of lane signal lights is 5.5m-7m. The following figure shows the following:
Taking traffic signals as an example, the vertical field of view situation.
●Example of the harm of visual field loss to driving:
Local visual field defects can lead to a large blind spot in the field of vision, while the horizontal line of vision is not affected
Horizontal blindness in patients can lead to complete disappearance of the upper/lower half of the visual field, while the visual field on the horizontal line is not affected
Glaucoma patients may experience arc-shaped visual field defects, while the horizontal visual field is not affected
●The correct interpretation of "horizontal vision reaching 150 degrees" in Order 139 of the Ministry of Public Security
Single eye horizontal field of view reaches 150 degrees:
It is not enough to only check the field of view on the horizontal line, and the upper and lower fields of view should also meet the following requirements:
Upper visual field examination range: 40 °
Scope of visual inspection below: 60 °
●Example of driver's monocular examination procedure in developed countries: (right eye)
●Chongqing Guote Medical Equipment Co., Ltd. driver's monocular visual field examination procedure: right eye as an example
The design principle of this program is based on the American standard driver inspection program and adds a horizontal field of view inspection range (160 °).
Nasal visual field examination range: 72 °
Temporal visual field examination range: 90 °
Upper visual field examination range: 40 °
Scope of visual inspection below: 60 °
Inspection standard: International perspective Goldmann standard
Visual indicator color: white
Vision size: Goldman III Vision
Background light color: white
Background brightness: 31.5 asb
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