It is a well-known fact that UV rays from the sun cause a lot of defects to the eye. These rays are found above the violent section of visible light spectrum and the major source is the sun. They exist in three major forms, which include UVC, UVB, and UVA. The wavelength in UVA is long and that permits it to penetrate glass with ease. Here is information about sunglasses lens types.
Scientists have not proved whether UVA can damage the eye or not. On the other hand, the second type of UV rays is extremely dangerous to the eye. This type is the UVB. It is advisable for people to wear sunglasses since these rays are not able to pass through glass. The UVC rays are blocked by the atmosphere and for this reason, they are not able to reach the earth.
As such, it is important to wear sunglasses as a preventive measure against damage that UVB causes. Besides serving as a preventive measure, sunglasses also act as a corrective measure for various eye defects. For instance, people who have myopia or long-sightedness need glasses to be able to see better at close and long range respectively. In order for these glasses to work effectively, they need to have lenses.
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 designed to reduce the glare that comes from surfaces such as water surfaces, glass, and snow. This makes images to appear clearer and sharper. One can get them in both prescription and non-prescription sunglasses. They can be worn indoors by people who are sensitive to light. Post-cataract surgery patients make very good candidates for glasses with polarized lenses.
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.
Scientists have not proved whether UVA can damage the eye or not. On the other hand, the second type of UV rays is extremely dangerous to the eye. This type is the UVB. It is advisable for people to wear sunglasses since these rays are not able to pass through glass. The UVC rays are blocked by the atmosphere and for this reason, they are not able to reach the earth.
As such, it is important to wear sunglasses as a preventive measure against damage that UVB causes. Besides serving as a preventive measure, sunglasses also act as a corrective measure for various eye defects. For instance, people who have myopia or long-sightedness need glasses to be able to see better at close and long range respectively. In order for these glasses to work effectively, they need to have lenses.
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 designed to reduce the glare that comes from surfaces such as water surfaces, glass, and snow. This makes images to appear clearer and sharper. One can get them in both prescription and non-prescription sunglasses. They can be worn indoors by people who are sensitive to light. Post-cataract surgery patients make very good candidates for glasses with polarized lenses.
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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