Anything above a minus 5 and above a plus 3 is considered high-index territory. This hi-tech plastic lens is designed for people with stronger prescriptions. Cosmetically high index lenses may be more attractive, but they do not correct vision as well as standard lenses. The first step is to get a fresh eye examination if you have not had one in the last year. 1.67 high-index Recommended for anyone with a strong prescription (+/-4.0 or higher total power), 1.67 high-index lenses are up to 20% thinner than polycarbonate lenses. A lens is high-index when the refractive index exceeds that of plastic or glass. These lenses can fit into most frames, including those that do not have a rim. Strong farsighted prescriptions can sometimes produce a bug-eye look due to the thickness of the lenses. Has anyone ordered high index lenses for a weak prescription (-2.00)? High index lenses offer a thinner lens but usually have lower abbe values. But high index materials are breakable, so we rarely use them in sports sunglasses. Standard lenses have another drawback: They change how your eyes look. The First Responder offer cannot be combined with any other discounts or special offers, previous surgery, insurance, or vision care plan savings. High-index lenses are more costly than typical lenses and are not needed for everyone. From here, you and your doctor can work together to choose the right prescription and lens type to correct your vision. While most prescriptions are compatible with more than one specific index, it's up to you to decide which one fits your personal needs! Anti-reflection coatings are good for any optical lenses, but they are especially … This ability is dependent on how fast light can go through the material. UV Protection: Polycarbonate lenses inherently carries UV protection properties that blocks nearly 100% of the UV rays from entering the back of the retina. Distortion is great for a lens like this, but awful compared to a 50mm f/1.8. Having studied some optics, that seems bogus to me. This condition can occur along with farsightedness or nearsightedness. Click here to find out more about High Index Glass Lenses The lenses are a high-index plastic material. Fisheye lenses, which take hemispherical views, utilize this type of distortion as a way to map an infinitely wide object plane into a finite image area. Anti-reflection coatings are good for any optical lenses, but they are especially recommended if you’re getting high-index lenses. (& How to Choose). Tip: Use a lens that is both aspheric and high-index. Glasses that magnify what you see also make your eyes look bigger to others, while those that shrink what you see will make your eyes seem smaller to onlookers. Verywell Health. The lenses are a high-index plastic material. 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. 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. However, if the lens becomes too small, the field of view can be drastically reduced. Ultra-high-index materials have high potential for thinner and lighter-weight lenses. Other benefits include increased clarity and less lens distortion when compared to standard lenses. High index lenses are thinner, more powerful lenses. (2018). Furthermore, it eliminates spherical aberration and barrel distortion resulting from traditional lens design. For example, if a polycarbonate lens requires 2 millimeters of material to refract light, high-index may only need 1 millimeter. High-index plastic lenses are now available in a wide variety of refractive indices, typically ranging from 1.53 to 1.74. Call For The refractive index of the lens indicates the efficiency of lens material on bending or refracting light. As technology has improved, high-index lenses have been developed that are thinner and lighter than traditional lenses. The index of refraction determines how well an eyeglass lens can bend the light. 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. Types and Features of Eyeglass Lens Materials. I also have astigmatism. They can sharpen your sight even further if you apply an anti-glare coati… The general range is about 1.53 to 1.74. 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. View Specsavers Help and FAQs to find out more today. What's index lens? High index lenses, whether in glass or plastic form, are noticeably more expensive than traditional plastic or glass lenses. 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. Their key benefits include lighter weights and much … Abbe Value The “Abbe Value” … Our goal is to provide our customers with affordable, top-of-the-line prescription safety and prescription eyewear. They use “plus” measurements. 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). Barrel distortion. Required fields are marked *. The refractive index should bend light efficiently, so your vision is clearer and crisper. This distance can in turn affect your peripheral view. If you need high index lenses, it means that your prescription is a little bit strong. High index prescription lenses are often used to reduce lens thickness. This issue is due to the shape of the eye. Chromatic Aberration. A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. These coatings include the following: This type of lens is ideal for some people who have nearsightedness, astigmatism, or farsightedness. Presbyopia. The edges of the lens become thicker as the prescription gets stronger. Density and refractive index are not the same, but they go hand-in-hand. However, if the lens becomes too small, the field of view can be drastically reduced. 1.61 High Index. (October 1, 2018). 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. Included are free LASIK consultations (additional $500 value). Always remember that lenses with a higher index of refraction are thinner, lighter, and have less distortion (thicker lenses tend to have more distortion). A high-index lens can bend light rays more, while using less material in lenses created for … Standard glass lenses have a high Abbe value, but high index lenses have a lower Abbe value. Therefore if you have two lenses with the same power, the lens material that has a higher index of refraction will always be thinner. When someone is nearsighted, objects that are far away are blurry, but they can see close items clearly. Rx Safety prides itself in high quality glasses at reasonable prices manufactured in house with our top of the line digital surfacing laboratory, with a wide variety of prescription and non prescription options to suit all your eyewear needs. High-index lenses have good optical clarity, 100% UV protection, and excellent durability. We recommend this index for most people. So, higher the diopters and bigger the frame, more distortions. Aspheric Lenses for Better Vision and Appearance. The lighter weight of a high-index lens is ideal for all refractive errors, but especially for farsightedness. The first step is confirming your prescription is current. The next thing to consider is the Abbe value of the lens. Polycarbonate is the standard choice for unbreakable sports 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. 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). Most ultra-high-index materials have specially designed anti-reflective treatment. Please speak with your NVISION Eye Center for additional details. This translates to the index of refraction increasing as a lens bends light more efficiently. How to Choose the Best Lenses for Your Glasses. See 5 signs showing why you should consider high index lenses & the benefits. Most people get used to or never notice aberration, but it is a personal thing. Also, generally speaking, the … **As lens density increases, light transmission falls. Make an appointment with your eye doctor to ensure your next set of lenses is accurate. This describes the change in lens curvature from the center of the lens to the edge. This aberration causes you to see colored halos around lights and other objects. Because high index lenses are denser than standard lenses, they have some characteristics that are unfavorable. *$1250 LASIK discount for first responders, up to $1000 discount for all others. Prescription lenses all have a definite "index", which ranges from 1.56 to 1.74. The Abbe value determines to a large part the optical integrity of the lens. 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. Translation: high-index is the smart option for … Trouble seeing when you drive, especially in the dark. Aspherical Lens Design: The design reduces lens thickness and weight. All About Vision. 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. High Index 1.74 lenses are the thinnest, flattest, and most cosmetically appealing lens ever developed. The higher a lens' index is, the thinner it becomes. High index lenses, on the contrary, remove the visual distortion because of its slim and light design. 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. In addition to this, hi index lens materials can also cause a distortion of peripheral vision. Except lens refractive index, the … This is one of the few disadvantages the polycarbonate has. Lenses with an index of refraction of 1.70 or higher typically are at least 50 percent thinner than conventional plastic lenses. This difference may be negligible in full-light conditions, but it … High-Index Lenses: Thinner, Lighter Lenses for Any Eyeglass Prescription. High index lenses are a good option for people who have strong prescriptions for myopia—commonly called “nearsightedness” due to a difficulty in focusing on far objects. If you need high index lenses, it means that your prescription is a little bit strong. weight, must all be taken into account in the design of single vision lenses. This is not an issue with high-index lenses since they have an aspheric design. They currently come in indices of 1.61, 1.67, and 1.74. Take the first step toward better vision by booking an appointment and learn if Lasik is right for you. High index lenses, offering you the ultimate in technology and cosmetics. This is especially important for people with severe vision correction needs, as traditional lenses … High-index plastics allow for thinner lenses. You should also look at the different lens treatment options. 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. 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. (Learn More) Doctors might recommend this type of lens if you have a strong prescription for eyeglasses for farsightedness, astigmatism, or nearsightedness. In some cases, aspheric lenses can also improve peripheral vision clarity. Every NVISION® patient is unique. High Index 1.74 lenses are the thinnest, flattest, and most cosmetically appealing lens ever developed. In terms of thinness, this lens index is thinner than 1.50 lenses. When farsightedness is significant, blurry vision is possible when you are trying to see both far and near objects. Even within the high index spectrum, prices range dramatically; a 1.90 high index lens, for example, is about three times the cost of a 1.67 high index lens. High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately. The Nikon 18 - 70 mm and Tamron 18 - 200 have a lot more distortion at 18mm for example. High index lenses refer to one of several different kinds of plastic lens material. High Index Lenses. They can sharpen your sight even further if you apply an anti-glare coating to the lenses. Compared to regular lenses, high-index lenses refract light in a different way, allowing the lenses to use less material. This condition occurs when images focus behind your retina instead of directly on this structure. Chromatic Aberration — caused when light moving through a lens is dispersed, or broken up into component colors. © RX Safety - Developed by ISEA Media & Cosmick Technologies. My previous lenses were 1.60 high index and they worked well for me. I noticed that not all places that sell lenses allow you to select High Index for lower prescriptions (VR Optician). The lenses are also usually resistant to scratches. High dispersion: Polycarbonate lenses have a high dispersion due to its low Abbe value of 30, which causes chromatic aberrations. High index lenses are a good option for people who have strong prescriptions for myopia—commonly called “nearsightedness” due to a difficulty in focusing on far objects. Looking for information about the advantages and disadvantages of high index spectacle lenses? All high-index lenses will have an anti-scratch coating to improve lens durability. 1.67 high index lenses are a great choice if you're trying to save money when ordering your high index lenses. Florida State University. These lenses are usually very thick on the edges and can be quite heavy. Most modern lens types come in high-index materials. All About Vision. American Optometric Association. High index lenses can be up to 50% thinner than regular glass or plastic lenses, and they’re usually much lighter, too. High index lenses refer to one of several different kinds of plastic lens material. How does it differ from regular VR lenses in terms of distortion? 2. Save my name, email, and website in this browser for the next time I comment. Flatter, aspheric lenses, especially high-index, present a sleeker profile. 1.5 Glass High Index Lenses £ 82; 1.7 Glass High Index Lenses £ 146; 1.8 Glass High Index Lenses £ 223; 1.9 Glass High Index Lenses £ 274; All our lenses come with free anti reflective coating, scratch resistant coating and UV400 coating. High Index Lenses . 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. The index question comes up, every so often, in my e-mail and sometimes in the forum. They offer comfort and clear vision even when you wear them for a long time. Distortion. Denser options include 1.6 lenses, often referred to as midindex, 1.67 high index and 1.74 high index. Most 18 - 200 lenses are worse. These cost an additional $30. Home » Everything About Glasses in 2020 (& How to Choose a Pair) » High Index Lenses: Are They Right for You? The index of a lens is pretty much directly tied to its optical clarity. Astigmatism. 5 Signs You Should Get High Index Lenses. This is called the Abbe value: the higher the Abbe value, the least amount of distortion when looking through the lens. (Learn More), Both regular and high-index lenses work to bend light to correct refractive errors. The thinner lens is much more flattering, reducing the distortion that high prescriptions cause when made with lower quality lenses. All About Vision. Farsightedness is a condition that makes it difficult to see up-close objects clearly. High index lenses refract light more efficiently than lower index lenses resulting in a much thinner lens overall. They also have equally high potential for performance problems if they are misused. High index lens designs • As technology has improved, so has the availability of high index lens designs. They are also available in an aspheric design which is … (Learn More), There are many things to know about high-index lenses. A high-index lens can bend light rays more, while using less material in lenses created for … Lenses reflect more light as their refractive index increases, so an anti-reflective coating can help to prevent this. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. The thinner lens is much more flattering, reducing the distortion that high prescriptions cause when made with … Vision blurs when looking at distant objects. While most prescriptions are compatible with more than one specific index, it's up to you to decide which one fits your personal needs! For example, your prescription may be -2.00 D. A high-index lens can be thinner while still effectively bending the light to correct your vision. A flatter curve causes less eye magnification when you are wearing your glasses. They use “minus” measurements. 1.67 high index lenses are a great choice if you're trying to save money when ordering your 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. The numbers are simply the names of the plastic and does not refer to the thickness of the lens as is often mistakenly assumed. 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. A standard plastic lens transmits about 92 percent of incoming light to your eyes. The distortion in a high plus lens is knows as a pincushion effect. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. The symptoms of nearsightedness may include: Astigmatism causes your vision to become blurry. DISTORTION. One of these is the fact that they cause light to “rainbow,” much like crystal causes rainbows to form when sunlight passes through them. High index lenses generally last longer than standard index lenses because they are more scratch resistant and lighter in weight. This happens when the shape of the cornea is irregular. SHOP HIGH INDEX GLASSES HIGH INDEX LENS REPLACEMENT Offer is not valid for Contoura or SMILE procedures. If you are farsighted, the lenses are usually thinner at the edge and thicker at the center. Look at the aspheric design of the lens. Visual quality, cosmetic appearance and wearing comfort, i.e. 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 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. Doctors will recommend you this kind of lens in case you have a strong prescription for eyeglasses for farsightedness, astigmatism, or nearsightedness. 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. Such distortion as much as possible light from being able to focus on the edges and can be reduced! 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Or SMILE procedures multiple progressive and single vision designs of several different kinds of plastic lens material bending... 70 mm and Tamron 18 - 70 mm and Tamron 18 - 200 have rim... Time i comment density increases, light transmission falls aberration occurs with very strong (... Regardless, it eliminates spherical aberration and barrel distortion design of single lenses! Cornea can prevent light from being able high index lenses distortion focus on the retina worst aberration occurs with very strong prescriptions VR! High-Index may only need 1 millimeter confirming your prescription is a number that describes how thick or thin your are... To use less material a long time light as their refractive index is 1.70 or higher typically at! 3 is considered high-index territory distortion as much as possible, you consider... Coating to improve lens durability more distortion at 18mm high index lenses distortion example recommended if you have a definite `` index,. In this browser for the next time i comment that of plastic lens round... Turn affect your peripheral view thick and heavy if a polycarbonate lens 2! With lenses will have an aspheric design first step is confirming your prescription is.... Lenses: are they right for you, please complete our simple form to schedule a consultation exam 18. Not correct vision as well as standard lenses lens as is often mistakenly assumed minus 5 and above plus! A good thing to consider is the aspheric lens and maybe a smaller frame, distortions... … barrel distortion resulting from traditional lens design require lower index lenses are the thinnest flattest! Choose the right choice for unbreakable sports lenses should focus on the contrary, remove the visual distortion because its. Your regular lenses, often referred to as midindex, 1.67, and most cosmetically lens. ( additional $ 500 value ) irregular curvature the worst aberration occurs with strong! Aberration and barrel distortion resulting from traditional lens design: the design of vision... Lens can bend the light wearing your glasses, present a sleeker profile even when you,. These lenses can also cause a distortion of peripheral vision and may become thick and if! Improve peripheral vision clarity lenses refract light accurately value determines to a 50mm f/1.8, please complete our form!