It is common knowledge by now that UV rays from the sun cause a lot of damage to the eye. UV rays are located above the violet portion of the visible light spectrum and its main source is sunlight. There are three main categories of UV, that is, UVA, UVB, and UVC. UVA has a longer wavelength, which allows it to pass through normal glass easily. The information below is worth knowing about sunglasses lens types.
It is an issue of dispute among scientists whether UVA rays are harmful to the eyes. On the contrary, UVB pose a very big danger to eyes because they are capable of causing harm. It is vital put on sunglasses and sunscreen because of the harm UVB causes. UVB rays cannot pass through glass or sunscreen. Lastly, UVC are not available on the surface of the earth because they are blocked by the atmosphere.
Since UVB rays can damage the eye, it is always necessary to wear sunglasses as a protective measure. Other than acting as a protective gear for UVB rays, sunglasses also help prevent a number of defects of the eye. For example, people who have eye conditions such as long-sightedness or myopia require glasses to see well at long and close range respectively. Lenses are necessary in order for these glasses to work well.
There are certain varieties of lenses that are worn in order to realize diverse effects. Such examples of lenses include polycarbonate, progressive, polarized, photochromic, bifocal and trifocal, aspheric and Hi index. Aspheric lenses are created using a complex front surface that curves progressively from the middle to the edge. They are used for correcting minor defects in vision. Their lightness and thinness makes them convenient to carry and wear
Bifocal lenses are made in a special way to be able to correct far-sightedness as well as short-sightedness. The lens in the upper part of the glasses is for correcting far-sightedness while the lower part has a lens for correcting short-sightedness. They are mostly prescribed for old people whose near-vision has deteriorated as a result of aging. Trifocal lenses add the ability to see objects that are a few feet away into bifocal glasses.
When light from the sun hits photochromic lenses, they become darker. This makes them convenient for people who require multiple sunglasses for various conditions. These lenses can be found in all lens materials. For example, one can find trifocal, bifocal or high-index lenses that are photochromic. Most people regardless of the age prefer photochromic lenses.
Polarized lenses are made in a way that they decrease the reflection that comes from surfaces like glass, snow and water surfaces. This helps the wearer to perceive objects more clearly and sharper. Polarized lenses are available as prescription as well as non-prescription sunglasses. They are worn by people who are sensitive to light. People who have recently undergone surgery for cataract find these products very suitable.
Polycarbonate lenses on the other hand are a good option for individuals who are always active. These lenses are made such that they are able to withstand impact and are very durable. They are commonly bought by most parents for their kids since kids commonly damage sunglasses.
It is an issue of dispute among scientists whether UVA rays are harmful to the eyes. On the contrary, UVB pose a very big danger to eyes because they are capable of causing harm. It is vital put on sunglasses and sunscreen because of the harm UVB causes. UVB rays cannot pass through glass or sunscreen. Lastly, UVC are not available on the surface of the earth because they are blocked by the atmosphere.
Since UVB rays can damage the eye, it is always necessary to wear sunglasses as a protective measure. Other than acting as a protective gear for UVB rays, sunglasses also help prevent a number of defects of the eye. For example, people who have eye conditions such as long-sightedness or myopia require glasses to see well at long and close range respectively. Lenses are necessary in order for these glasses to work well.
There are certain varieties of lenses that are worn in order to realize diverse effects. Such examples of lenses include polycarbonate, progressive, polarized, photochromic, bifocal and trifocal, aspheric and Hi index. Aspheric lenses are created using a complex front surface that curves progressively from the middle to the edge. They are used for correcting minor defects in vision. Their lightness and thinness makes them convenient to carry and wear
Bifocal lenses are made in a special way to be able to correct far-sightedness as well as short-sightedness. The lens in the upper part of the glasses is for correcting far-sightedness while the lower part has a lens for correcting short-sightedness. They are mostly prescribed for old people whose near-vision has deteriorated as a result of aging. Trifocal lenses add the ability to see objects that are a few feet away into bifocal glasses.
When light from the sun hits photochromic lenses, they become darker. This makes them convenient for people who require multiple sunglasses for various conditions. These lenses can be found in all lens materials. For example, one can find trifocal, bifocal or high-index lenses that are photochromic. Most people regardless of the age prefer photochromic lenses.
Polarized lenses are made in a way that they decrease the reflection that comes from surfaces like glass, snow and water surfaces. This helps the wearer to perceive objects more clearly and sharper. Polarized lenses are available as prescription as well as non-prescription sunglasses. They are worn by people who are sensitive to light. People who have recently undergone surgery for cataract find these products very suitable.
Polycarbonate lenses on the other hand are a good option for individuals who are always active. These lenses are made such that they are able to withstand impact and are very durable. They are commonly bought by most parents for their kids since kids commonly damage sunglasses.
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