How much do you know about sunglasses?

In the summer, ultraviolet light can easily cause damage to the eyes, so many people like to wear sunglasses to reduce the intense sunlight on the eyes. Can sunglasses be worn for a long time? A few days ago, American ophthalmologists suggested that wearing sunglasses should be enough, otherwise it will cause eye damage.

Don't wear sunglasses for “dressing” sunglasses for a long time will cause eye fatigue, and then cause eye function gradually decline.

In most cases, the main purpose of people wearing sunglasses is to prevent UV rays, but there may be "misunderstandings" in their understanding. For example, some people think that since wearing sunglasses can prevent UV rays, the longer it takes to wear, the better the prevention effect should be. Therefore, they wore sunglasses almost every day when they went out, and even when they were indoors they did not bother to take them off. From the eye health point of view, this habit should be promptly corrected.

There are two disadvantages of wearing sunglasses for a long time. After ordinary people wear sunglasses, the feeling of the eyes on the external objects will be very different in peace time, specifically in the following two aspects: First, the contrast of the objects observed by the eyes is very different. After wearing sunglasses, many people will feel that it is not as clear as when they are not wearing sunglasses. To see more clearly, they naturally look hard at the objects. After a long time, the fatigue of the eyes will increase. Colored sunglasses can cause people’s eyes to be in relatively dim light, and their pupils will subconsciously disperse. If people’s eyes stay in this state for a long time, even if the original vision is better, it will be degraded in the future. However, this degradation process is relatively slow and difficult to detect in the short term, so it is easier to take people lightly.

Second, although ultraviolet rays in the sun can be partially blocked by sunglasses lenses, medical studies have shown that ultraviolet rays are diffused after being absorbed by the lenses. Therefore, after wearing sunglasses, the pupils of the human eye will become flickering and fluctuating. This is the reason why people feel uncomfortable after wearing sunglasses. If you ignore the changes in the external environment, wearing sunglasses all day, it will cause damage to the eyes.

Inadvertent sunglasses most hurt the eyes when people choose sunglasses must be careful, do not greedy for cheap to buy cheap sunglasses, some sunglasses shoddy, even with their own degree of myopia, once long-term wear, will inevitably cause serious damage to normal vision people. If it is in a less intense environment than ultraviolet light, sunglasses should be removed promptly. At the same time, for the sake of safety, those suffering from glaucoma, color blindness, night blindness, and optic nerve retinopathy should be kept away from sunglasses. Middle-aged and elderly people with deteriorating vision and preschool children with fragile optic nerves should not wear sunglasses at any time.