What are the functions of sunglasses?

Release time:

2023-01-17

People usually rely on adjusting the pupil size to adjust the luminous flux in the sun. When the light intensity

People usually rely on adjusting the pupil size to adjust the luminous flux in the sun. When the light intensity exceeds the adjustment ability of the human eye, it will cause damage to the human eye. Therefore, in outdoor activities, especially in summer, it is necessary to use sunshade mirrors to block the sun, so as to reduce the fatigue caused by eye adjustment or the damage caused by strong light stimulation.

Ultraviolet rays can damage the cornea and retina, and high-quality sunglasses can completely eliminate ultraviolet rays.

When the eye receives too much light, it naturally shrinks the iris. Once the iris shrinks to the limit, then people need to squint. If there is still too much light, such as sunlight reflecting off snow, it can damage the retina. High-quality sunglasses can filter out up to 97% of light entering the eye to avoid damage.

Some surfaces, such as water, reflect a lot of light, and this creates bright spots that can confuse vision or hide objects. Good sunglasses can completely eliminate this glare using polarizing technology, which we'll get to in a bit.

Certain frequencies of light blur vision, while others enhance contrast. Choosing the right color for your sunglasses will make it look better in a given setting.

If sunglasses do not provide UV protection, it will expose you to more UV rays. Cheap sunglasses filter some of the light, causing your irises to open to receive more light. This will also allow more ultraviolet rays to enter, increasing the damage caused by ultraviolet rays to the retina.

Therefore, there is indeed a difference between the various sunglasses. For a specific use environment, choosing suitable and high-quality sunglasses will provide you with the greatest protection.

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