紫外线（UV）来自太阳和其他一些地方，例如晒黑床和特殊的紫外线。太阳的大部分辐射被大气阻挡，因此只有一小部分到达地球。当您在外面的阳光下度过时光，从阳光中散发出来的紫外线会使您的身体产生维生素D，这是健康人体必需的营养素。每天仅几分钟的阳光就能在您的体内产生足够的维生素D，以改善您的情绪并为您提供能量。适量的维生素D还可以帮助降低患心脏病和高血压的风险。因此，每天至少要在阳光下玩乐几分钟！

但是，紫外线辐射也可能有害，尤其是长时间暴露在紫外线下时。首先，紫外线辐射会导致晒伤。长时间暴露在阳光下会损害皮肤细胞，并产生令人不快的晒伤感。已知紫外线会导致皮肤癌的发展，例如黑色素瘤和癌。紫外线可以抑制免疫系统，增加皮肤中癌细胞生长的可能性。晒黑也不是一个好主意。这可能会导致阳光损坏，皮肤和皱纹过早老化。长时间外出时，请始终佩戴防晒霜并尝试寻找一些阴影。请记住，紫外线仅少量有益于您-太多，最终可能导致灼伤，甚至更糟。

紫外线会与皮肤一起伤害您的眼睛。太阳光产生的大部分紫外线会被眼睛的前部组织吸收。这可能会损坏角膜并增加黄斑变性和白内障的风险。如果您的眼睛在短时间内暴露在大量阳光下，您可能会遇到称为光性角膜炎的病状。尽管这没有持久的作用，但它很痛苦且不舒服，通常会导致眼睛发红，灼热和流水。它类似于皮肤上的晒斑。如果您在外面花费大量时间，那么您的眼睛也可能会遭受长期伤害。累积暴露于紫外线辐射会灼伤角膜，从而影响视力。您还可以在眼前发展白内障，即晶状体模糊或混浊。

这就是为什么必须戴紫外线防护眼镜的原因！无论您是在户外度过大量时间，还是通勤时间短，阴影都能保护您的眼睛免受紫外线辐射的伤害。就像在出门前戴上防晒霜一样，将防紫外线眼镜作为优先事项。优先保护眼睛。

Ultraviolet radiation (UV) comes from the sun and a few other places, like tanning beds and special ultraviolet lights. Most of the sun’s radiation is blocked by the atmosphere, so only a small percentage reaches the Earth. When you spend time outside in the sunlight, the UV rays that do make it here from the sun cause your body to produce vitamin D, a necessary nutrient for a healthy body. Just a few minutes of sunlight a day can produce enough vitamin D in your body to improve your mood and give you energy. The right amount of vitamin D can also help lower the risks of heart disease and high blood pressure. So have fun in the sun for at least a few minutes a day!

However, UV radiation can also be harmful, especially when you expose yourself to it for extended periods of time. Firstly, UV radiation causes sunburns. Prolonged exposure to sunlight damages skin cells and produces the unpleasant feeling of a sunburn. UV rays are known to cause the development of skin cancers, like melanoma and carcinomas. UV radiation can suppress the immune system, increasing the likelihood of cancerous cell growth in your skin. Too much tanning is not a good idea, either. This can lead to sun-damaged prematurely aging skin and wrinkles. Always wear sunscreen and try to find some shade when you are outside for extended periods. Remember that UV rays are only good for you in small amounts—too much and you might end up with a burn, or worse.

Along with your skin, UV light can also damage your eyes. Most of the ultraviolet radiation from sunlight is absorbed by the front tissue of your eyes. This can cause damage to your corneas and increase your risk for macular degeneration and cataracts. If your eyes are exposed to a large amount of sunlight in just a short period of time, you might experience a condition called photokeratitis. While this has no lasting effects, it is painful and uncomfortable, usually resulting in redness, burning, and watering of the eyes. It is similar to a sunburn on your skin. If you spend a lot of time outside, you could suffer long-term damage to your eyes as well. Cumulative exposure to UV radiation can result in burns to your corneas, which will affect your sight. You can also develop cataracts, a blurred or clouded lens on the front of the eye.

This is why wearing sunglasses is a must! Whether you spend a great deal of time outside, or you only have a short commute, your shades can protect your eyes from UV radiation damage. Just like putting on your sunscreen before heading outside, make sunglasses a priority. Make protecting your eyes a priority.