Sunglasses protect the eyes from UV damaging rays and uncomfortable glare. A complete guide to buying sunglasses online.
Strong sunlight contains a lot of ultraviolet and infrared rays, which may damage the cornea, lens, and even the fundus of the eye. Wearing a pair of sunglasses can block or absorb part of the light and reduce irritation to the eyes. Therefore, in outdoor activities, many people like to wear sunglasses to reduce the stimulation of sunlight. Some people also like to use it as decoration. There are many types of sunglasses available to choose from.
Basic functions of sunglasses
Ultraviolet rays can damage the cornea and retina, and high-quality sunglasses can eliminate ultraviolet rays.
When the eye receives too much light, it naturally contracts the iris. Once the iris shrinks to its limit, then people need to squint. If there is still too much light, such as sunlight reflected from snow, it can damage the retina. High-quality sunglasses can filter out up to 97% of the light entering the eye to avoid damage.
Certain surfaces, such as water, reflect much light, and the resulting bright spots can distract from sight or hide objects. Premium sunglasses use polarizing technology to eliminate this type of glare.
Specific frequencies of light blur vision, while others enhance contrast.
Please choose the right color for sunglasses to make them look better in a given environment.
If sunglasses do not provide UV protection, they expose the eyes to UV rays. Therefore, there is indeed a difference between the various types of sunglasses. Choosing the right, high-quality sunglasses for a specific usage environment will provide maximum protection.
Sunglasses Lens classification
The sunglasses lenses are roughly divided into five types: anti-reflective protective lenses, tinted lenses, colored lenses, polarized lenses, and photochromic lenses.
Anti-reflective protective lens: This lens is coated with a thin layer of magnesium fluoride on the surface to prevent strong light reflection. They are allowing one to see things more clearly and not be disturbed by intense light. Point the glasses at the light source to test if the sunglasses have anti-reflective protective lenses. If there are purple or green reflections, the lenses have an anti-reflective protective film.
Tinted lenses: In lens production, some chemicals are added to make the lenses appear colored to absorb light of specific wavelengths. It is the type of lens most commonly used in sunglasses.
Colored lens: The effect of this lens is the same as that of the tinted lens, only the way of making it is different. It is to paint the color on the surface of the lens. The most well-known is the “gradual colored lens”. Darkest at the top, then lighter at the bottom. Generally, sunglasses with degrees are mostly treated with colored lenses.
Polarized lens: The polarized lens uses a unique vertical coating to filter the dazzling light of the sun on the water, land, or snow in the same direction. Best for outdoor sports such as cycling, skiing, or fishing.
Photochromic lenses: also known as “photosensitive lenses”. Because the chemical substance of silver halide is added to the lens, the original transparent lens will become a colored lens when exposed to intense light. Therefore, it is suitable for indoor and outdoor use simultaneously.
Clip-on lenses: Clip-ons are polarized sunglasses specially designed for myopic people, which can effectively prevent glare and UV rays. Best for driving, fishing, and other outdoor sports. The visual resolution is greatly improved by using polarization technology. Eliminates 99% of reflected and scattered light, making vision clearer and softer. The lens is specially enhanced with a film, which is effectively resistant to wear, scratches, and impacts.
Night driving lens: The night driving lens should be able to block more than 80% of the intense light of the other party’s car. The light transmittance of the primary lens must be > 75%. The observation of the road will not be affected. Wear a good pair of driving night vision goggles at night can effectively reduce the dazzling glare and other harmful light from the headlights of the other party’s car. One can see the road normally to ensure the driving safety while blocking the intense light.
Sunglasses Lens color features
Grey lens: gray lens can absorb evenly any color spectrum. Therefore, the viewing scene will only become darker. There will be no obvious color difference, showing an authentic and natural feeling. Belongs to a neutral color.
Brown lens: filters out much blue light and can improve visual contrast and clarity. It is better to wear in the case of severe air pollution or foggy conditions. Generally, it can block the reflected light of the smooth and bright surface. The wearer can still see the fine details, which is the ideal choice for the driver.
Green lenses: Maximize the green light reaching the eyes while absorbing light. So it has a relaxed and comfortable feeling, suitable for people prone to eye fatigue.
Blue-gray lens: Similar to the gray lens, both belong to the neutral lens. The color is darker, and the visible light absorption rate is higher.
Mirrored silver lens: The lens surface adopts a high-density mirror coating. Such lenses absorb and reflect more visible light, which is suitable for outdoor sports.
Yellow lenses: Strictly speaking, such lenses are not sun lenses because they hardly reduce visible light. However, yellow lenses can improve contrast in foggy and twilight times and provide more accurate vision, also called night vision goggles. Some young people wear “sunglasses” with yellow lenses as decoration.
Light blue, light pink, and other lenses: the same is more decorative than practical lenses.
Dark green lenses: Bring a fantastic feeling. The light transmittance and clarity are low, suitable for wearing when basking in the sun.
Blue lenses: Blue lenses can be worn when playing on the beach. The blue can effectively filter out the light blue reflected by the sea and the sky. Blue lenses should be avoided when driving. Because they can make it difficult for us to distinguish the color of traffic signals.
Sunglasses Use Classification
Sunglasses can generally be divided into dark, light, and special-purpose sunglasses.
As the name suggests, the so-called dark sunglasses are used for shading. People usually adjust the luminous flux by adjusting the pupil size of the sun. When the light intensity exceeds the adjustment ability of the human eye, it will cause damage to it. Therefore, in summer, many people use sun visors to block the sun to reduce the fatigue caused by eye adjustment or the damage caused by intense light stimulation.
Light-colored sunglasses are rich in color and suitable for use with all kinds of clothing. They have a strong decorative effect. Young people favor light-colored sunglasses because of their rich colors and diverse styles. Fashionable women are even more fond of them.
Special-purpose sunglasses have a vital function of blocking sunlight and are often used in fields with strong sunlight, such as beaches, skiing, mountain climbing, golf, Etc. Their anti-ultraviolet performance and other indicators have higher requirements.
Different groups of people choose sunglasses according to different preferences and use. However, the most fundamental thing is to start from the basic principle of ensuring the safety of the wearer and the vision from being damaged. Reducing intense light stimulation, clear vision, no deformation, anti-ultraviolet, no distortion of color recognition, and accurate identification of traffic signals should be the essential functions of sunglasses.
Face shape guide for sunglasses
Sunglasses are the focal point of the entire face, which powerfully outline the contours of the face, just like a thick belt that highlights the small waist of a skirt. What kind of face shape and framed sunglasses should I wear?
Round-face shape: It is suitable for glasses with a slightly thick frame and dark lens color. It has the visual effect of a “tightening” face. Sunglasses with overblown yellow lenses, red lenses, or slim frames make a face look bigger.
Narrow-face shape: It is suitable for wearing a thin frame or rimless sunglasses. Choosing elegant blue, purple, light brown, and another lens color will have an unexpected effect.
Long-face shape: Choose a flat circle or arc lens and slightly thick arms to reduce the elongated sense of a long face. Choose a feminine pink or wine red lens to enhance the brightness of the face.
Square-face shape: It is suitable for sunglasses with narrow width and a rounded frame. The too large or too square frame will make a face look squarer.
Wide-face shape: Suit to choose a lighter color lens, thinner metal frame, or rimless sunglasses to avoid a wider upper face that is more expansive.