Views: Author: Site Editor Publish Time: 2023-05-01 Origin: Site
The main function of Metal Sunglasses is to prevent strong sunlight from affecting vision. At the same time, more and more people regard it as an ornament and match it with clothing. At present, Metal Sunglasses are generally divided into two categories: "sunshade mirror" and "fashion mirror". Among them, the main function of the "sun visor" is to protect the human eye from ultraviolet rays, so the "sun visor" has higher requirements on the quality of the lens. The main function of the "fashion mirror" is decoration, and the requirements for shading are not outstanding.
Here is the content list:
l Who should not wear sunglasses for a long time?
l Light transmittance of Metal Sunglasses
1. After wearing sunglasses, the amount of visible light entering the eyes decreases, and the pupils will naturally dilate. Over time, it is easy to induce acute attacks of angle-closure glaucoma, with symptoms such as red eyes, eye pain, and a sharp decline in vision. Therefore, glaucoma patients or people suspected of having glaucoma should not wear Metal Sunglasses.
2. Children under the age of 6 are not suitable for wearing sunglasses for a long time, because their visual function development has not reached the adult level, and wearing Metal Sunglasses for a long time may cause amblyopia.
The light transmittance of Metal Sunglasses refers to the ratio between the luminous flux passing through the sunglasses and the incident luminous flux. This value directly shows the amount of light that can pass through the sunglasses in the visible spectrum region, which can directly reflect the shading effect of the sunglasses. In real life, if the value does not meet the corresponding standards, the sunglasses will not achieve the effect of a sunshade and will affect the wearer's vision due to strong sunlight. Especially in winter in the north, affected by the reflection of snow, unqualified sunglasses will affect the vision of pedestrians and drivers, and increase the probability of traffic accidents.
The uniformity of light transmittance of sunglasses refers to the uniformity of light transmittance at specific positions within and between lenses of Metal Sunglasses. Western developed countries have set clear standards for the detection of this indicator. With the deepening of the global integration situation, the current division of labor in industrial production is becoming more and more detailed, and more and more attention is paid to the division of labor and cooperation. The production process of sunglasses is refined into design→drawing→process→proofing→frame production→lens cutting→assembly. Among them, several steps from design to frame production do not involve sun lenses, so the uniformity of light transmittance of the lenses will not be affected. At the same time, since most sunglasses manufacturers do not manufacture sunglasses, they cooperate with lens manufacturers to purchase lenses according to their own manufacturing needs. Therefore, the process factors that affect the uniformity of light transmittance of sunglasses are divided into three types: lens production process, cutting process, and assembly process.
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