To determine the best treatment for you, please complete our simple form to schedule a consultation exam. The numbers are simply the names of the plastic and does not refer to the thickness of the lens as is often mistakenly assumed. High index lenses allow even strong prescriptions to be made with thin, lightweight lenses. Standard optical plastic has a refractive index of 1.5. 5 Signs You Should Get High Index Lenses. High-index lenses bend light more efficiently than a standard lens, which means thinner, lighter lenses can be used to correct nearsightedness, farsightedness, and astigmatism. I have Hi-Index lenses with prisms and haven't had any problems. Except lens refractive index, the … High index lenses generally last longer than standard index lenses because they are more scratch resistant and lighter in weight. My Nikon 18-200mm is pretty good as these lenses go at both ends, and only has strong pincushion in the middle. The Nikon 18 - 70 mm and Tamron 18 - 200 have a lot more distortion at 18mm for example. The Abbe value determines to a large part the optical integrity of the lens. Most people who wear eyeglasses are nearsighted. A lens is high-index when the refractive index exceeds that of plastic or glass. The solution is the aspheric lens and maybe a smaller frame, this decreases the chance that distortion will appear. This condition can occur along with farsightedness or nearsightedness. 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. If you are very farsighted or nearsighted, your regular lenses will usually be quite heavy and thick. High dispersion can occur with a low Abbe value, causing a chromatic aberration. American Optometric Association. These ultra thin lenses are nearly 50% thinner than plastic and 5% thinner than 1.67 high index lenses, offering you the ultimate in technology and cosmetics. *$1250 LASIK discount for first responders, up to $1000 discount for all others. Having studied some optics, that seems bogus to me. High index lenses are made of a plastic material which bends light more than standard CR39 lenses and can therefore be made thinner and lighter allowing for more cosmetically appealing and comfortable to wear glasses.. The lenses are a high-index plastic material. Chromatic Aberration — caused when light moving through a lens is dispersed, or broken up into component colors. Please speak with your NVISION Eye Center for additional details. Required fields are marked *. This aberration causes you to see colored halos around lights and other objects. Hi Index Lenses. UV Protection: Polycarbonate lenses inherently carries UV protection properties that blocks nearly 100% of the UV rays from entering the back of the retina. High Index Lenses . The index of a lens is pretty much directly tied to its optical clarity. Cosmetically high index lenses may be more attractive, but they do not correct vision as well as standard lenses. High-Index Lenses: Thinner, Lighter Lenses for Any Eyeglass Prescription. Doctors will recommend you this kind of lens in case you have a strong prescription for eyeglasses for farsightedness, astigmatism, or nearsightedness. High dispersion: Polycarbonate lenses have a high dispersion due to its low Abbe value of 30, which causes chromatic aberrations. They use “plus” measurements. This is especially true when you wear your glasses at night. The expense is primarily due to the added cost of the manufacturing process which, of course, is passed along to consumers. high index lenses are denser than standard lenses, Optical clarity is especially compromised if you have. Vision blurs when looking at distant objects. The lenses are a high-index plastic material. The frame with lenses will be more natural in shape and the eyewear will look better too. The index of refraction determines how well an eyeglass lens can bend the light. High-index Lenses. Standard glass lenses have a high Abbe value, but high index lenses have a lower Abbe value. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. Has anyone ordered high index lenses for a weak prescription (-2.00)? Prescription lenses all have a definite "index", which ranges from 1.56 to 1.74. If you need high index lenses, it means that your prescription is a little bit strong. They can sharpen your sight even further if you apply an anti-glare coating to the lenses. It causes an incorrect bending of light rays, so images focus in front of the retina. Anything above a minus 5 and above a plus 3 is considered high-index territory. Lenses with an index of refraction of 1.70 or higher typically are at least 50 percent thinner than conventional plastic lenses. Therefore, people wearing thick lenses should choose round frames or oval frames to reduce such distortion as much as possible. High-index lenses have good optical clarity, 100% UV protection, and excellent durability. My distance script is -6.00 and -5.25, I have the 1.67 aspheric hi index lenses in my glasses and aside from the usual distortortion you get on the edges with Hi-Index there is no problem with the prisms themselves. A 1.70 index lens reflects 6.7 percent of incident light compared to only 3.8 percent for a 1.49 index lens. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. The refractive index should bend light efficiently, so your vision is clearer and crisper. The refractive index of the lens indicates the efficiency of lens material on bending or refracting light. The distortion in a high minus lens is knows as a barrel effect. This is one of the few disadvantages the polycarbonate has. In some cases, astigmatism is due to the lens inside the eye having an irregular curvature. High index lens designs • As technology has improved, so has the availability of high index lens designs. There are several factors to consider, how much you want to spend on lenses.Always keep in mind that higher index = better optical quality (thinner lenses, less distortion) – and lower index, conversely, is always cheaper. 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. High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately. Vision can be corrected with less material, making the lens much … Make an appointment with your eye doctor to ensure your next set of lenses is accurate. Those who have a mild prescription of say, -2.00 diopter do not need high index lenses because their lenses will already not be very thick, nor have a distortion issue. The thinner lens is much more flattering, reducing the distortion that high prescriptions cause when made with lower quality lenses. See 5 signs showing why you should consider high index lenses & the benefits. Other benefits include increased clarity and less lens distortion when compared to standard lenses. These high index lenses are recommended if you have a strong eyeglass prescription for refractive errors … High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately. When farsightedness is significant, blurry vision is possible when you are trying to see both far and near objects. So, higher the diopters and bigger the frame, more distortions. Additionally, high-index lenses can help reduce distortion that is common with stronger prescriptions. These lenses can fit into most frames, including those that do not have a rim. Florida State University. Barrel distortion. Generally speaking, the higher the index of your lens, the more it will cause This difference may be negligible in full-light conditions, but it … 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. A flatter curve causes less eye magnification when you are wearing your glasses. Density and refractive index are not the same, but they go hand-in-hand. This translates to the index of refraction increasing as a lens bends light more efficiently. The general range is about 1.53 to 1.74. These lenses are usually very thick on the edges and can be quite heavy. All About Vision. I recently got a new set of lenses, 1.67 high index with Crizal coating. The thinner lens is much more flattering, reducing the distortion that high prescriptions cause when made with … 2. Strong farsighted prescriptions can sometimes produce a bug-eye look due to the thickness of the lenses. Your email address will not be published. High index lenses have a higher Abbe value than prescriptions made from standard plastic or glass, which means that there's a greater potential for distortion, particularly in your peripheral vision. They use “minus” measurements. Learning the basics can make it easier to talk to your eye doctor to determine if this lens is right for you. Thus a 1.74 hi index plastic bends the … Presbyopia. High-index lenses are more costly than typical lenses and are not needed for everyone. High Index Lenses . My previous lenses were 1.60 high index and they worked well for me. The next thing to consider is the Abbe value of the lens. (Learn More), There are many things to know about high-index lenses. They're lightweight and stylish, but are mostly reserved for those with higher vision correction needs. Save my name, email, and website in this browser for the next time I comment. Contact Lens Practice. This happens when the shape of the cornea is irregular. **As lens density increases, light transmission falls. As material density increases, so does its refractive index. It is caused by dispersion: the refractive index of the lens elements varies with the wavelength of light.The refractive index of most transparent materials decreases with increasing wavelength. High-index lenses are ideal for you if you are looking for eyeglasses that are lighter and thinner. Verywell Health. Regular glass or plastic lenses for high amounts of nearsightedness or farsightedness can be quite thick, heavy, and make the wearer's eyes appear to be larger or smaller than they actually are. High index lenses refer to one of several different kinds of plastic lens material. The lenses are also usually resistant to scratches. Those who have a mild prescription of say, -2.00 diopter do not need high index lenses because their lenses will already not be very thick, nor have a distortion issue. Distortion on lens edge for higher prescriptions: It may sometimes be difficult to see out the edges of a polycarbonate lens, mainly because of its field of vision and the manner in which the lens bends light. Ernst Abbe was a German mathematician and physicist who discovered that lenses made from different materials have varying amounts of chromatic aberration. The higher a lens' index is, the thinner it becomes. All About Vision. High index lenses can be up to 50% thinner than regular glass or plastic lenses, and they’re usually much lighter, too. For example, your prescription may be +2.00 D. If you are nearsighted, your lenses are usually thinner at the center and thicker at the edge. Rx-Safety.com is a family-owned and – run optical lab and online store. If you have standard index lenses and are tired of the weight, eye distortion, and/or color distortions caused by your lenses, it’s time to switch to high index glasses. September 10, 2018. When someone is nearsighted, objects that are far away are blurry, but they can see close items clearly. High-index lenses can be ideal for many people. We recommend this index for most people. Flatter, aspheric lenses, especially high-index, present a sleeker profile. 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. Thick lenses, especially those with high refractive indexes, can distort our eyes and the eye area. For example, if a polycarbonate lens requires 2 millimeters of material to refract light, high-index may only need 1 millimeter. In barrel distortion, image magnification decreases with distance from the optical axis.The apparent effect is that of an image which has been mapped around a sphere (or barrel). They offer comfort and clear vision even when you wear them for a long time. For strong prescription, the higher the index, the thinner the lens; for weak prescriptions, a low index lens will be no thicker than high index eyeglass lenses. Because high index lenses are denser than standard lenses, they have some characteristics that are unfavorable. Types and Features of Eyeglass Lens Materials. High-index lenses bend light more efficiently, so they do not have to be as thick to be effective. I ordered new glasses recently (high diopter prescription), and the person helping me (not the optometrist) said that the high index lenses would reduce distortion at the edges. Ultra high index lenses are a good choice for people with prescriptions over +/-6.00 sphere. Abbe Value The “Abbe Value” … The lenses for this vision issue are usually thicker at the lens’ edge, but thin in the center. Most modern lens types come in high-index materials. The worst aberration occurs with very strong prescriptions (+/- 8.00 or more) and the highest indexes. Standard lenses have another drawback: They change how your eyes look. 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. © RX Safety - Developed by ISEA Media & Cosmick Technologies. (Learn More). For strong prescription, the higher the index, the thinner the lens; for weak prescriptions, a low index lens will be no thicker than high index eyeglass lenses. However, if the lens becomes too small, the field of view can be drastically reduced. Although these lenses are generally recommended for people with high optical prescriptions, high index lenses can benefit anyone who would like a thinner lens profile. Included are free LASIK consultations (additional $500 value). Distortion. High index lenses refer to one of several different kinds of plastic lens material. Two people with the same lenses may have completely different feelings about how distracting it is. This is called the Abbe value: the higher the Abbe value, the least amount of distortion when looking through the lens. weight, must all be taken into account in the design of single vision lenses. I am nearsighted with a fairly strong prescription (sorry, don't have the numbers handy). But high index materials are breakable, so we rarely use them in sports sunglasses. The higher … A high-index lens can bend light rays more, while using less material in lenses created for … Denser options include 1.6 lenses, often referred to as midindex, 1.67 high index and 1.74 high index. This is especially important for people with severe vision correction needs, as traditional lenses … Call For The lenses may not be lighter, however, due to the increase in density vs. mid- and normal index materials. You should also look at the different lens treatment options. DISTORTION. 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. Therefore if you have two lenses with the same power, the lens material that has a higher index of refraction will always be thinner. Like the 1.61 and 1.67 high-index lenses, it has an aspheric surface, improving the wearer’s visual quality while reducing distortion of the wearer’s eyes as seen by others. 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