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 classified depending on the use for which they are meant. Major categories are corrective, safety, 3D, sunglasses, and fashion articles. Corrective lenses as suggested by the name help in correcting refractive errors. They achieve this by bending the light that enters the eye so as to eliminate effects of conditions like astigmatism, hypermetropia, presbyopia and myopia. Corrective lenses are designed in conformation to prescriptions made by optometrists or ophthalmologists. The correctness of the prescriptions is verified using a lensmeter.
Safety glasses are special products specifically meant for preventing injuries and contamination caused to the eyes. They keep liquid and solid substances away from the sensitive organs in different working settings. Plastic used to make their lenses is shatter-resistant. Goggles are sometimes used as replacements for welding helmets when helmets cause discomfort or inconvenience. Goggles like those ones contain dark lenses. The lightweight nature and flexibility of nylon-framed products make them applicable by athletes during training and competitions.
Bright light and UV radiation can be harmful to eyes hence wearing sunglasses is sometimes necessary. Such products incorporate lenses that are photosensitive. Their color changes from clear to dark in bright UV light. This way, the lens is able to block off excess light from passing through it to the eyes. Horizontally polarized beams are also removed by modern products because they have light polarization capability.
In the current world many people wear these products for fashion purposes while others do so as a way of hiding their eyes. There are many famous people and celebrities who wear eyeglasses to distinguish themselves from movie characters they play or for identity. Blind people also put on glasses that are near opaque 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 on the other hand is suitable for strong prescriptions. Aspheric lens has a surface that is made of differing degrees of curvature. This makes it different from ordinary spherically shaped types of lens. Its shape allows it to have a lager usable portion than others.
These items get classified depending on the use for which they are meant. Major categories are corrective, safety, 3D, sunglasses, and fashion articles. Corrective lenses as suggested by the name help in correcting refractive errors. They achieve this by bending the light that enters the eye so as to eliminate effects of conditions like astigmatism, hypermetropia, presbyopia and myopia. Corrective lenses are designed in conformation to prescriptions made by optometrists or ophthalmologists. The correctness of the prescriptions is verified using a lensmeter.
Safety glasses are special products specifically meant for preventing injuries and contamination caused to the eyes. They keep liquid and solid substances away from the sensitive organs in different working settings. Plastic used to make their lenses is shatter-resistant. Goggles are sometimes used as replacements for welding helmets when helmets cause discomfort or inconvenience. Goggles like those ones contain dark lenses. The lightweight nature and flexibility of nylon-framed products make them applicable by athletes during training and competitions.
Bright light and UV radiation can be harmful to eyes hence wearing sunglasses is sometimes necessary. Such products incorporate lenses that are photosensitive. Their color changes from clear to dark in bright UV light. This way, the lens is able to block off excess light from passing through it to the eyes. Horizontally polarized beams are also removed by modern products because they have light polarization capability.
In the current world many people wear these products for fashion purposes while others do so as a way of hiding their eyes. There are many famous people and celebrities who wear eyeglasses to distinguish themselves from movie characters they play or for identity. Blind people also put on glasses that are near opaque 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 on the other hand is suitable for strong prescriptions. Aspheric lens has a surface that is made of differing degrees of curvature. This makes it different from ordinary spherically shaped types of lens. Its shape allows it to have a lager usable portion than others.
Tidak ada komentar:
Posting Komentar