This describes the ability of the lens to disperse different light wavelengths as they pass through. Offer is not valid for Contoura or SMILE procedures. This condition occurs when images focus behind your retina instead of directly on this structure. ** In a 1.74 high-index lens, about 86 percent of incoming light passes through. Every NVISION® patient is unique. Vision can be corrected with less material, making the lens much … High Index lenses are thinner, stronger, and more versatile than standard eyewear lenses.They are made from extremely durable plastic and are regarded as the best lenses you can get for your prescription glasses. While most prescriptions are compatible with more than one specific index, it's up to you to decide which one fits your personal needs! All About Vision. They have relatively low optical distortion for high index lenses, and they offer the thinness, scratch resistance, and aesthetics you'd want from high index lenses without an outrageous price tag. All high-index lenses will have an anti-scratch coating to improve lens durability. The lenses are a high-index plastic material. Astigmatism. High-Index lenses are designed flexibly to bend light and maybe the right choice for you if you are searching for thinner and lighter lenses. 1.61 High Index. Furthermore, it eliminates spherical aberration and barrel distortion resulting from traditional lens design. The higher … 14 15. Barrel distortion. Strong farsighted prescriptions can sometimes produce a bug-eye look due to the thickness of the lenses. Ultra high index lenses are available in 1.67, 1.71, and 1.74; in general, the higher the index, the thinner the lens but if your prescription is at the lower end of the range, using a higher index will not result in a thinner frame. Click here to find out more about High Index Glass Lenses High index lenses allow even strong prescriptions to be made with thin, lightweight lenses. Unlike high minus lenses, the finished blank size of a high-powered plus lens plays a vital role in dictating the final thickness of the lens when glazed. If you are shopping for high index lenses and haven’t had them before, there are some things you should know about how the index of a lens can affect your vision. Chromatic Aberration — caused when light moving through a lens is dispersed, or broken up into component colors. Ernst Abbe was a German mathematician and physicist who discovered that lenses made from different materials have varying amounts of chromatic aberration. What's index lens? If you need high index lenses, it means that your prescription is a little bit strong. High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately. In optics, chromatic aberration (CA), also called chromatic distortion and spherochromatism, is a failure of a lens to focus all colors to the same point. High-Index Lenses: Thinner, Lighter Lenses for Any Eyeglass Prescription. These types of lenses are thinner and lighter than normal, which means the back surface of the lens is placed further away from the natural curve of your eye. View Specsavers Help and FAQs to find out more today. Almost all high-index lenses have some type of UV-blocking treatment to protect your eyes from the sun. Modern high index plastic lenses are great, with the right frame choice ( not too big) the lenses will look thin with a 1.67 index, thinnest of all would be a 1.74 index Posted 7 years ago alanl Trouble seeing when you drive, especially in the dark. 2. High dispersion: Polycarbonate lenses have a high dispersion due to its low Abbe value of 30, which causes chromatic aberrations. Cosmetically high index lenses may be more attractive, but they do not correct vision as well as standard lenses. 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