Wearing anti-ultraviolet sunglasses in the summer when the sun is strong can not only block the dazzling light but also protect the eyes from ultraviolet rays, which is also a fashion. Next, let's take a look at the specific functions and principles of the following UV-protection sunglasses.

Ultraviolet light belongs to invisible light (also known as electromagnetic radiation), and the wavelength of ultraviolet light is below 400nm in the spectrum. There are many glasses with UV protection functions that have a UV400 mark, which is the UV protection rating unit of glasses, and UV400 glasses indicate 100% UV protection (this is achieved by special coating technology on the lenses).

Ophthalmologists recommend that you must always wear sunglasses to protect your eyes; this is because our eyeball (lens) is very easy to absorb ultraviolet rays, and the damage of ultraviolet rays has two prominent characteristics:

1. UV damage will accumulate. Since ultraviolet light is invisible light, it is difficult for people to perceive it intuitively.

2. The damage of ultraviolet rays to the eyes is irreversible, that is, irreparable. Such as cataract surgery can only be replaced by intraocular lenses. Long-term damage to the eye can easily lead to damage to the cornea and retina, clouding of the lens until cataract occurs, resulting in permanent visual damage.

Since the damage of ultraviolet rays to the eyes is invisible, it cannot be felt immediately. If you don’t wear glasses, you don’t feel particularly uncomfortable. It just means that your eyes are not very sensitive to visible light (such as dazzling glare, glare, and reflected light) and cannot avoid UV damage.

To identify whether a pair of sunglasses has the function of UV protection, you can see obvious signs such as "UV protection" and "UV400" on the labels or lenses of some products. "UV index" is the effect of filtering out ultraviolet rays, which is an important criterion for purchasing sunglasses. Light with a wavelength of 286nm-400nm is called ultraviolet light. Generally speaking, a 100% UV index is impossible. The UV index of most sunglasses is between 96% and 98%.

Sunglasses marked as "UV400" can protect against more than 90% of ultraviolet rays, and their lenses are specially processed to block ultraviolet rays with a wavelength of less than 400nm. Those who wear contact lenses can choose contact lenses with anti-ultraviolet function, which can filter out 90% of ultraviolet rays, and then wear sunglasses, the safety level is even higher.

When choosing sunglasses, in addition to considering their UV protection function, you should also check the diopter of the lenses. At this time, you can put the sunglasses back and forth in front of your eyes. If the object moves with the lens, it means that the lens has a diopter, which will be detrimental to the eyes.

In addition, it is necessary to check the smoothness of the surface of the lens. If the surface of the lens is not smooth, the external objects we see will be deformed and distorted, resulting in soreness of the eyeball, and even symptoms of visual fatigue such as nausea, forgetfulness, and insomnia.

As a professional global manufacturer of optical frames and sunglasses, we can meet all your packaging needs. Our products have a variety of choices in materials, styles, and sizes, and have absolute quality assurance. From product design to export, we have carried out comprehensive quality control. We can also provide a comprehensive customized service, if you want to buy our sunglasses, please contact us immediately.