Eye glasses are lenses that contain frames made of wood, plastic, metal, ceramic or other materials for maintaining their position on the eyes. Names like spectacles and glasses are also used to refer to them. Different people around the world wear them for different reasons. Today, one glass can perform more than one function due to incorporation of various features into them. In San Antonio eye glasses are prescribed and produced by eye care professionals with several years of experience. Products in San Antonio are therefore of high quality.
These items get grouped depending on their application. Main groups are corrective, sunglasses, fashion, safety, and 3D articles. Corrective lenses are used to correct refractive errors in people with impaired vision. They eliminate the effects presented by various eye conditions like astigmatism, presbyopia, myopia, and hypermetropia through bending of light as it enters the eye. Their designs are all meant to meet the prescriptions made by eye care experts such as optometrists and ophthalmologists. Accuracy of prescriptions may be verified by use of a lensmeter.
Safety glasses are used when doing various activities to secure eyes from flying debris. The lens in them is made from shatter-resistant plastic. When worn, they protect eyes from solid and liquid materials like blood and chemicals which may splatter from the working surface. Some provide protection from welding flash in cases where welding helmets are uncomfortable or inconvenient. Their lenses are dark. Athletes also use glasses with nylon frames during training or competitions because they are light and flexible.
Sunglasses are worn to protect one from bright light and sometimes from UV light. They incorporate photosensitive lenses which change color to dark when they are struck by ultraviolet light. The transformation of the lens to a dark color helps in blocking off excess light being transmitted to the eye through the lens. Current manufacturers incorporate light polarization in the products to remove horizontally polarized light rays.
Today, many people wear glasses to hide eyes or for style. Many celebrities identify, distinguish or separate themselves from their movie characters by wearing these products. Near opaque glasses are also worn by blind people for cosmetic reasons.
For many years lenses were made from glass, but today manufacturers are shifting to high-tech plastics. High-tech plastics offer more benefits compared to glass hence the reason for the shift. Manufacturers prefer plastics because they are more scratch-resistant, thinner, lighter, durable, hard to break, and have the ability to be treated. As such, lenses are now placed into various groups such as trivex, polarized, photochromic, aspheric, polycarbonate, and high index plastic.
Each lens category is suitable for use in different applications. For instance, polycarbonate lens is resistant to impact hence suitable for children and athletes. Trivex lens is lighter, thinner, and offers better vision correction although its properties and those of polycarbonate lens are similar. Plastic used to manufacture trivex lens is relatively newer too.
Strong prescriptions are on the contrary served well with high index plastic lens. The surface of aspheric lens is composed of differing degrees of curvature. This differentiates it from ordinary spherical lenses. Because of the shape and nature of its surface, aspheric lens has a lager usable surface.
These items get grouped depending on their application. Main groups are corrective, sunglasses, fashion, safety, and 3D articles. Corrective lenses are used to correct refractive errors in people with impaired vision. They eliminate the effects presented by various eye conditions like astigmatism, presbyopia, myopia, and hypermetropia through bending of light as it enters the eye. Their designs are all meant to meet the prescriptions made by eye care experts such as optometrists and ophthalmologists. Accuracy of prescriptions may be verified by use of a lensmeter.
Safety glasses are used when doing various activities to secure eyes from flying debris. The lens in them is made from shatter-resistant plastic. When worn, they protect eyes from solid and liquid materials like blood and chemicals which may splatter from the working surface. Some provide protection from welding flash in cases where welding helmets are uncomfortable or inconvenient. Their lenses are dark. Athletes also use glasses with nylon frames during training or competitions because they are light and flexible.
Sunglasses are worn to protect one from bright light and sometimes from UV light. They incorporate photosensitive lenses which change color to dark when they are struck by ultraviolet light. The transformation of the lens to a dark color helps in blocking off excess light being transmitted to the eye through the lens. Current manufacturers incorporate light polarization in the products to remove horizontally polarized light rays.
Today, many people wear glasses to hide eyes or for style. Many celebrities identify, distinguish or separate themselves from their movie characters by wearing these products. Near opaque glasses are also worn by blind people for cosmetic reasons.
For many years lenses were made from glass, but today manufacturers are shifting to high-tech plastics. High-tech plastics offer more benefits compared to glass hence the reason for the shift. Manufacturers prefer plastics because they are more scratch-resistant, thinner, lighter, durable, hard to break, and have the ability to be treated. As such, lenses are now placed into various groups such as trivex, polarized, photochromic, aspheric, polycarbonate, and high index plastic.
Each lens category is suitable for use in different applications. For instance, polycarbonate lens is resistant to impact hence suitable for children and athletes. Trivex lens is lighter, thinner, and offers better vision correction although its properties and those of polycarbonate lens are similar. Plastic used to manufacture trivex lens is relatively newer too.
Strong prescriptions are on the contrary served well with high index plastic lens. The surface of aspheric lens is composed of differing degrees of curvature. This differentiates it from ordinary spherical lenses. Because of the shape and nature of its surface, aspheric lens has a lager usable surface.
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