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Usually, people are very difficult to understand the in and outs of what type of eyeglass lenses are available. Most people simply think that lenses only have myopia and hyperopia lenses. Exactly, if you are not an expert in the optometry field or never touch the optical business or without any prescription eyeglasses online experience. So, do you know how to classify lenses?
According to the different material, eyeglass lenses have glass lens, resin lens, PC lens and acrylic lens. From the refractive index can be divided into CR-39, 1.49, 1.50, 1.61, 1.74 and so on. Also, through the function of the lenses, there are Single Vision, Regular Bifocal, Trifocals, Progressive, Photochromic (also called Transition) and Polarized lenses.
Also, for the strong prescription, aspheric lens is perfect choice because of they are flatter and thinner. And they could provide better vision than standard lenses and look better because they lessen farsighted and nearsighted eye magnification. Bifocals and trifocals come in many configurations, depending on whether you sit at the computer all day or play golf. Progressive lenses can do everything a bifocal or trifocal can, but without a line and looks like the common lens. Anti-reflective finishes, UV coatings and scratch-resistant finishes are options that make lenses more striking and longer lasting.
At present, there is a new kind of optical product, it is functional Free Form Progressive lenses. For the different groups, wearing different kinds of progressive lenses, and then will be satisfied for the wearers with specific needs. If you are viewing a computer for more than two hours a day, sing this kind of glass lenses can effectively reduce the fatigue for eyes. Because it has a narrow distance area, and maximize intermediate area to use for computer, you could view the computer screen clearly and effectively.
Computer lenses help correct vision for the specified distance from your eye to the computer screen and its immediate surrounding area. A variety of specific computer lenses include special filters, tints, and anti rad properties, which can be added to enhance eyeglass features. These kinds of lenses come from www.cheapglasses123.com. |
