Indeed, many people are aware of the damage of ultraviolet rays to their skin. Before going out, they will remember to apply a thick layer of sunscreen to their skin, but they will forget that their eyes also need protection. Poor sunglasses deceive your eyes. Some people may realize the need to wear sunglasses, but can your sunglasses effectively block ultraviolet rays? Can choosing the darkest lens block enough ultraviolet rays? Many friends often confuse [visible light] with [ultraviolet light]. The [darkness] of the lens, In fact, it is only for visible light that we can normally see. In order to see things, The eye leaves a transparent channel for all kinds of visible or invisible light, including ultraviolet rays. Light passes through the transparent cornea. Through the pupil, To the transparent lens, And then into the vitreous cavity, Through the transparent vitreous body, To the retina. The pupil is a small hole surrounded by a ring of iris. Standing in front of the lens like a guardrail. When the surrounding light is strong, The muscles on the iris responsible for narrowing the pupil will immediately work hard. Shrink [aperture], The light entering the lens and retina will decrease. On the contrary, In the dark, widen [aperture], Make more light enter the eyes. Wear a pair of dark sunglasses that are inferior but cannot effectively resist ultraviolet rays. It is equivalent to deceiving our pupil-it thinks it is in a dark environment. Relaxed his guard, Open the door. Little imagine, Ultraviolet rays invisible to the naked eye, He also swaggered in. Although the amount of ultraviolet radiation in the daily environment from outside to inside is much weaker than that in welding and ultraviolet lamps, But it can still be absorbed by eye tissue all the time. If we don’t have adequate protection, Ultraviolet rays may affect the normal structure of the eye to some extent. Cataracts are originally glittering and translucent lenses, For various reasons, it gradually becomes cloudy and less transparent. We call it cataracts. Senile cataracts are the most common, Among the many influencing factors, The close relationship with ultraviolet rays has been proved. In fact, ultraviolet rays are irradiating the eyeball every day. This is a process of low dose and long-term exposure. The older you get, The longer the exposure is, the longer it will be. Ultraviolet rays can cause a series of effects on the substances and cell functions that maintain the transparency of the lens, thus causing the lens to gradually become turbid. In areas with strong sunshine, the incidence of cataract increases and the age of occurrence is relatively early. Of course, ultraviolet rays are not the only factor. Even without exposure to ultraviolet rays, The lens may also become cloudy, It’s just that, Maybe the symptoms are lighter, Or later. The retina also absorbs ultraviolet rays, Especially the macular area, the central area that receives light. Current research shows that, Both ultraviolet and visible light can promote the occurrence of age-related macular degeneration and other macular diseases. However, Since the retina is at the end of the eyeball, the lens is rushed at the front line, which greatly reduces the ultraviolet radiation to it. The damage of corneal and conjunctival ultraviolet rays to the cornea, we in another article < < watching people burn welding will blind my eyes? In addition, pterygium, a disease that occurs on our ocular surface, is more common in places with high ultraviolet intensity such as plateau or coastal areas, although the exact cause is still unknown, indicating that ultraviolet may be one of the causes. How to prevent ultraviolet damage to eyes? 1. Select a qualified pair of sunglasses. When the sunglasses are produced, There are a series of physics standards. It requires sunglasses not to block out a large amount of visible light. But on the premise of blocking ultraviolet rays of a certain wavelength, And make sure that as much visible light as possible enters. In addition, In terms of manufacturing technology, We should also ensure that the degree is accurate and there is no discomfort such as distortion and discoloration. As non-professionals, it is difficult for us to judge whether the glasses meet the above standards. Therefore, we are encouraged to go to a regular optician’s shop and choose regular manufacturers to produce sunglasses with the function of blocking ultraviolet rays. 2. Pay attention to the weather forecast. Have you noticed? In some weather forecasting websites or mobile phone applications, It will provide a value called ultraviolet index. It will change greatly throughout the day. It will be updated at any time according to the measured values. Referring to the above suggestions, We can know that, Do you need protection at this time? 3. Omni-directional three-dimensional protection If you need to go out when ultraviolet rays are strong, Or need to stay outdoors, water surface, snow, glaciers, plateaus and other environments for a long time, Multi-layer protection is recommended, For example, wear sunglasses while wearing a hat. In particular, Patients suffering from some diseases such as acute angle-closure glaucoma are not suitable to wear sunglasses for a long time. Please be sure to consult your doctor. In addition, Children under the age of 8 are still in the visual development period and need normal light and image stimulation. They are all [good friends] who come together with the [old acquaintance] of ultraviolet rays. They cannot all refuse to wear sunglasses. Therefore, it is not recommended to wear sunglasses frequently. After all, this [old acquaintance] is not bored to be treated as an enemy when he does not lose his temper. He must not lose big because of small losses.