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.
The use for which these articles are meant is used to categorize them. Main categories are safety, 3D, corrective, sunglasses, and fashion articles. Refractive errors in individuals suffering from vision impairment use corrective lenses to correct the defects. The products eliminate effects caused by eye conditions such as myopia, hypermetropia, astigmatism, and presbyopia. This is achieved through bending light rays that pass through the glass. Optometrists or ophthalmologists make the prescriptions for all designs of glasses. Lensmeter is the device used in verification of the accuracy of prescriptions.
Safety glasses are solely for protecting the eyes against flying debris. Shatter resistant plastic is used to make the lens. They provide safety against both liquid and solid substances in various working conditions. Sometimes welding helmets may be inconvenient or uncomfortable hence special types of goggles are used to protect eyes. Such goggles have dark lenses. Athletes use nylon-framed products in training and competitions due to their lightweight and flexibility.
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.
High index plastic lens is designed to suit strong prescriptions. Their curvatures are made of differing degrees. The nature of curvature distinguishes it from traditional lenses which are normally spherical. Usable surface in aspheric lens is larger because of the nature and shape of the surface.
The use for which these articles are meant is used to categorize them. Main categories are safety, 3D, corrective, sunglasses, and fashion articles. Refractive errors in individuals suffering from vision impairment use corrective lenses to correct the defects. The products eliminate effects caused by eye conditions such as myopia, hypermetropia, astigmatism, and presbyopia. This is achieved through bending light rays that pass through the glass. Optometrists or ophthalmologists make the prescriptions for all designs of glasses. Lensmeter is the device used in verification of the accuracy of prescriptions.
Safety glasses are solely for protecting the eyes against flying debris. Shatter resistant plastic is used to make the lens. They provide safety against both liquid and solid substances in various working conditions. Sometimes welding helmets may be inconvenient or uncomfortable hence special types of goggles are used to protect eyes. Such goggles have dark lenses. Athletes use nylon-framed products in training and competitions due to their lightweight and flexibility.
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.
High index plastic lens is designed to suit strong prescriptions. Their curvatures are made of differing degrees. The nature of curvature distinguishes it from traditional lenses which are normally spherical. Usable surface in aspheric lens is larger because of the nature and shape of the surface.
About the Author:
You can visit www.ophthalmologysa.com for more helpful information about Information About San Antonio Eye Glasses.
0 commentaires:
Enregistrer un commentaire