While high-index lenses can be beneficial for certain optical prescriptions, they can also be more expensive than regular lenses. Its main disadvantage is that the lens can be more reflective than conventional lenses, but this can be more than overcome with an anti-reflection coating. Thinner lenses have three advantages: they do not look thick, they do not magnify or minify your eyes when seen by others, and they are lighter. Cost. This led to demand for a high refractive index material that would allow thinner lenses. High index lenses have a lower Abbe rating than identical prescriptions formed from standard material. ADC lenses had several disadvantages, including low refractive index, and tended to be thick and cosmetically unappealing. For the best vision and appearance, it's a good idea to have an anti-reflective lens coating (AR coating) applied to high-index lenses. In midindex lenses, the ABBE value falls to 42, and in a 1.67 high index the value falls further to 32. Contents hide. Zenni, as example, sells very high index lenses (1.74) for about 80 USD upgrade cost. Compared to the conventional plastic or glass lenses, high index lenses can be up to three times the regular price but again, depending on the prescription. Disadvantages of high-index lenses. 1.74 High Index Lenses. With an antireflective coating, you can solve this problem. Typically this material will range from indices of 1.6 to 1.74. Compared to the conventional plastic or glass lenses, high index lenses can be up to three times the regular price but again, depending on the prescription. High index lenses with 1.60 high index are good for people with prescriptions over +/-4.00 sphere, because they are thinner and lighter. © RX Safety - Developed by ISEA Media & Cosmick Technologies. So while the thinner, lighter high indexes offer cosmetic benefits, they do not surpass traditional lenses in vision quality. High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately. And when the subject is eyeglasses, weight and thickness can mean a lot. They use “plus” measurements. Thinnest lenses for high prescription. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. So, they are the idea choices for people with strong prescription. If you are already at -2.00 diopters or less, spending the extra money will make no noticeable difference for you. It refers to the type of … Our High Index Lenses Include Free Coatings: With fewer reflections, more light passes through the lens to the eye for good vision and the lenses look more transparent and attractive. Buy High Index Lenses. Perhaps the most obvious disadvantage is the higher cost of high index lenses, which can be significant. One of the most obvious disadvantages is the fact that high index lenses tend to cost more than other types of lenses. Lens that would be extremely thick and heavy if made of standard material can be considerably thinner and lighter if formed of high index material. • Normal index – 1.48 to 1.53. Lisa Anderson This is a mind map talking about High index lenses. These types of lenses are thinner and lighter than conventional lenses; however, high index lenses do come with a downside. 1. The expense is due to the added cost of the manufacturing process and material waste that is associated with the more exacting process of forming, grinding, and finishing high index prescriptions. Compared with traditional lenses, highly index lenses can bend the light more efficiently, so they can be thinner while maintaining the same correction power. What are the disadvantages of progressive lenses? The Advantages of High Index Lenses. You can create a mind map like this effortlessly. What are the advantages and disadvantages of high index spectacle lenses? The higher a lens' index is, the thinner it becomes. Here are some advantages of polycarbonate lenses: Durable, providing extra safety to your eyes and promoting better eye health; 10 … For stronger prescriptions, the overall result will not be as thin as Glass High Index Lenses. Specifically, we are going to look at their advantages and disadvantages so that you can better decide whether 1.67 high index lenses are for you. Conventional lenses reflect 8 per cent of light, while high index lenses reflect up to 50 per cent of light. You put them on and go. Keep in mind that antireflective coatings can deteriorate with everyday wear and tear. Most are aspheric, therefore high plus lenses are kept flatter. How are they made? Not enough thinness. High index lenses are made from a chemical synthetic blend that's created through a special manufacturing process. Save my name, email, and website in this browser for the next time I comment. • Mid index – 1.54 to 1.63. Suitability According to "Eyecare Professional Magazine," with some prescriptions, there would be little or no advantage in having a high index lens, because the weight and thickness benefits between a high index lens and a conventional lens would be minimal. This distance can in turn affect your peripheral view. This is a specialty material that is recommended as a substitute for polycarbonate lenses. Nevertheless, one of the more important choices that you will have to make focuses on your lens material. • High index – 1.64 to 1.73. Disadvantages: At least twice the weight of plastic or polycarbonate lenses. These lenses are super-thin but are also more expensive than the polycarbonate option. It’s named after German physicist and mathematician Ernst Abbe, who discovered that different materials yield different levels of chromic aberration. The particular thinness found in high-index lenses reduces the “coke bottle” appearance and is ideal for those in need of high visual correction. Although there are numerous benefits to high index lenses, there are also several potential disadvantages that should be taken into consideration prior to purchase. 50%. Lenses with an index of refraction of 1.70 or higher typically are at least 50 percent thinner than conventional plastic lenses. They're lightweight and stylish, but are mostly reserved for those with higher vision correction needs. up. Regular Lenses vs. High-Index Lenses . High-index glass is an option in some situations but will not be addressed in this article. These plastic lenses are thinner and lighter than typical standard lenses. Units called diopters are used to measure the lens power necessary to correct refractive errors. Rx-Safety.com is a family-owned and – run optical lab and online store. Your eye doctor can also provide more information on any specific questions you may have. DISADVANTAGES OF HIGH INDEX LENSES Price. Also, generally speaking, the higher the index, the higher the cost of the lenses. 1. Finally, high index lenses can be more brittle and are definitely more reflective than standard materials. Why are high index lenses so expensive? It is more expensive than polycarbonate. Trivex … Though it is expensive, it worths. This problem can easily be remedied with the application of an anti-glare coating, but it’s another factor to bear in mind when weighing the pros and cons of high index lenses. Anti reflection coating is especially beneficial when used on high-index lenses, which reflect more light than regular plastic lenses. Nevertheless, various issues remained, including … The numbers are simply the names of the plastic and does not refer to the thickness of the lens as is often mistakenly assumed. 2. If you want to get high index lens, you can ask the optician to add an anti-reflective coating to the lenses. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. High-index lenses can improve lens comfort and appearance, and can even open the door to a larger variety of frames. 2 Lens … You can create a mind map like this effortlessly. The “Abbe Value” is a measurement of lens distortion. 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. Negligible Benefit A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. Compared with traditional lenses, highly index lenses can bend the light more efficiently, so they can be thinner while maintaining the same correction power. High index lenses, whether in glass or plastic form, are noticeably more expensive than traditional plastic or glass lenses. Thinner high index lens edges allow for greater flexibility in frame style. Your email address will not be published. However, That not means the higher the index of the lenses, the better the eyeglasses lenses. This is possible because of the more advanced material used. High index lenses have a lower Abbe rating than identical prescriptions formed from standard material. Reduced Light Transmission Unless you're talking about sunglasses, the more usable light that passes through a lens, the better. Due to the chemical makeup of the material from which they are created, high index lenses have more refractive power than standard plastic or glass. The overall length of your GRIN lens should stick far enough out of the skull to allow you to hold it during implantation and cement it to the skull. Anti-radiation glasses adopt the advanced vacuum ion plating technology and can block the electromagnetic radiation, therefore have no side effects to eyes. up. 3 Duplicate. So, they are the idea choices for people with strong prescription. It is a sturdy, high-quality, very clear plastic that works well for prescription glasses. You may also require thicker, fuller frames to both support and disguise the exposed edges – thereby limiting your frame choices to styles you may not particularly enjoy. 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. High Index Material Disadvantages. If one is not a careful handler of glasses – you know who you are! Polycarbonate Lenses Advantages & Disadvantages. Disadvantages of Plastic High Index Lenses Even with a good quality scratch resistant coating, care still needs to be taken as plastic lenses are easy to scratch. Its main disadvantage is that the lens can be more reflective than conventional lenses, but this can be more than overcome by apply an anti-reflection coating to the surface of the lens. You don’t need to pursue additional coatings. This distance can in turn affect your peripheral view. Its main disadvantage is that the lens can be more reflective than conventional lenses, but this can be more than overcome with an anti-reflection coating. The benefits of high index lenses are hard to overlook. Different b/t high index lens and regular lens. Trivex Lenses. For example, a 1.90 high index lens (the highest “high index” rating available) costs about three times the amount of a 1.67 high index lens (the lowest “high index” rating available). In addition to this, hi index lens materials can also cause a distortion of peripheral vision. These lenses are super-thin but are also more expensive than the polycarbonate option. Loading High index lenses 1010111770li Nov 8, 2015 . Polycarbonate is more common in different lens designs than Trivex. For the same prescription lenses, the higher the index, the thinner and lighter the lenses are. Was this answer helpful? Different b/t high index lens and regular lens. Consider also that you will likely not wear those glasses for more than a few months, if you are working on vision improvement. I got my existing frames reglazed online. 1.74 high index and above is only available in glass, and high index glass lenses are more brittle and easier to break than plastic. Ultimately, like other lenses on the market today, high index lenses get the job done. High-index lenses reflect up to 50 percent more light than conventional glass or plastic lenses. Later, plastic materials such as acrylic and polycarbonate entered widespread use as medium refractive index materials for eyeglass lenses. Can shatter or chip easier than lenses made of other materials. According to your prescription, you needn't use 1.6 index lens. While most prescriptions are compatible with more than one specific index, it's up to you to decide which one fits your personal needs! The Disadvantages of High Index Lenses. According to your prescription, you needn't use 1.6 index lens. Before choosing high-index, speak with your eye doctor to determine if these lenses are necessary for your individual prescription. Due to the chemical makeup of the material from which they are created, high index lenses have more refractive power than standard plastic or glass. However, if your prescription is either above a +3.00 or a -4.00 I generally recommend considering high index to control some of the chromatic aberration and to provide a cosmetically thinner lens. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. 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. More Reflective High index lenses are thinner, more powerful lenses. Also available as Double Aspheric lenses (they are surfaced on both sides to give a flatter and thinner look than standard high index lenses) Disadvantages of Plastic High Index Lenses Even with a good quality scratch resistant coating, care still needs to be taken as plastic lenses are easy to scratch. High Index Lenses Disadvantages. But they don’t block all damaging sunlight. The lab didn't have any 1.5 index lenses in stock so stuck 1.6 index lenses in. This means that … Hi, My prescription is -0.75 sph and -0.1 sph. The manufacturing process is more complicated and requires more precision as compared to other types of lenses. The Super Lenti is a custom-manufactured series of blended lenses for high myopes which attempts to eliminate the obvious mechanical and cosmetic disadvantages of high minus lenses and is available in powers from -12.00D to -48.00D in glass and -12.00D to -22.00D in resin. Your email address will not be published. Disadvantages. Even with a good quality scratch resistant coating, care still needs to be taken as plastic lenses are easier to scratch. To … 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.. AR-coated high-index lenses transmit up to 99.5 percent of light to the eye for optimum vision. Was this answer helpful? How are they made? Because of this, if you were to purchase standard lenses, you would notice that your lenses start to become heavy on your face. 48%. High index lenses also reflect a higher percentage of light than standard lenses. Glasses, Buying glasses. Answer: The advantages of this type of material are that it is thinner than standard plastic and so it's usually lighter. Refractive errors and lens powers required to correct them are measured in units called dioptres (D). At the same time, there is less need for high index, if you have a very low prescription. The higher the index rating, the less material required to make a lens in a particular prescription. The difference between your glasses' lens index can make a huge impact. The added costs are because high index lenses simply cost more to produce. The bottom line? The advantages of this type of material is that it is thinner than standard plastic and therefore also usually lighter. Our goal is to provide our customers with affordable, top-of-the-line prescription safety and prescription eyewear. Disadvantages of Double Aspheric Lenses. The amount of light-bending ability (lens power) that's needed to provide good vision is indicated on the spectacle prescription provided by your optician. However, high index lenses are more reflective and expensive than conventional lenses. So while the thinner, lighter high indexes offer cosmetic benefits, they do not surpass traditional lenses in vision quality. The Disadvantages of Choosing High Index Lenses for Your Sunglasses. Because of the ever-expanding range of high-index lenses on the market, many dispensers are unsure of how choose an appropriate lens for a patient. In fact, I wear polycarbonate for my lenses. 1.74 high index and above is only available in glass, and high index glass lenses are relatively brittle. Good for prescriptions over +/-8.00. This is because they take longer to thin down and waste more material from the grinding and finishing processes during manufacture. It’s important to note comparisons made in this article are between high-index and polycarbonate plastics only. So we’ll examine the two most common lens materials here and present the advantages and disadvantages you should be aware of. Because high index lenses may be more prone to scratches than standard corrective lenses, they may not be an ideal choice for avid beachgoers or other folks spending time on rugged outdoor activities … Learn the pros and cons of Trivex lenses. ... For instance, a high-index progressive lens might cost $350, whereas you might pay $310 for a high … Download. High index lenses are especially useful for people with high prescriptions. Our polycarbonate lenses have a 1.59 index which, while quite thin, is more focused on durability than lightness. Abbe value, which is a measurement of lens distortion, is also increased in high index lenses. Your eyeglass prescription also determines what kind of high-index … The refractive indexes of traditional plastic lenses and glass lenses are about 1.5 and 1.52 respectively. Zenni, as example, sells very high index lenses (1.74) for about 80 USD upgrade cost. We offer a few different indexes on our lenses. If high index lenses cannot offer you a noticeable reduction in weight or increase in appearance, they may not be worth the higher cost to you. These lenses are designed to … Advantages . Compared to conventional lenses, high index lenses are much thinner and lighter. The suggested prescription range is +/-4.00 to +/-8.00 sphere. Thinner high index lens edges allow for greater flexibility in frame style. High-index lenses can also be used to improve the fit of lenses in the frame. Contacts. … About 25 to 40 percent thicker than polycarbonate and high index plastic lenses. Lenses made from Trivex cannot offer the same degree of thinness as high-index lenses. Tags: others product Similar Mind Maps Outline Take Away Durability. For stronger prescriptions, the overall result will not be as thin as Glass High Index Lenses. Map Outline High index lenses Refractive Index . 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. This means that stronger prescriptions are lighter and thinner when formed from high index material. • Very high index – 1.74 to above. And opted for bog standard 1.5 index mutilcoated lenses. Lisa Anderson This is a mind map talking about High index lenses. The most obvious drawback of high index lenses is their cost. For instance, a high-index progressive lens might cost $350, whereas you might pay $310 for a high-definition progressive lens. 16 What are the advantages and disadvantages of high index spectacle lenses? Abbe Value The lenses are a high-index plastic material. High index lenses disadvantages Higher cost. However, That not means the higher the index of the lenses, the better the eyeglasses lenses. With standard lenses, as a prescription gets stronger, the outside of the lenses get thicker. Many eye care professionals also recommend adding anti-reflective and anti-scratch coatings to high-index … This does not mean, however, that high index lenses are without drawbacks. Trivex is a material developed for military purposes. But having said this, high index lenses are of higher quality. By choosing these lenses you won’t need to worry about whether you will be able to see clearly. Disadvantages. Shopping for eyeglasses can be complex. So many variables play into the equation that, unless you’re an expert, you often don’t know what to choose in order to maximize your opportunities and get exactly what you want and need. Ratio of velocity of light in vaccum to in optical medium ; Normal index n _> 1.48 but <1.54 ; Mid index n _> 1.54 … The technical definition for high-index lenses is any lens with a refractive index higher than 1.523. … These disadvantages are as follows: Less availability. Higher Cost In addition to this, hi index lens materials can also cause a distortion of peripheral vision. For example, your prescription may be … More Brittle Our 1.6, 1.67, and 1.74 index lenses can all be considered high index. You get what you … If you are already at -2.00 diopters or less, spending the extra money will make no noticeable difference for you. 3 Duplicate. Despite its benefits, it can be expensive and hard to find. We offer a few different indexes on our lenses. High-index spectacle lenses are the right choice if you want thinner, lighter lenses and glasses that are as attractive and comfortable as possible.. Thinner, lighter high-index lenses are especially recommended if you have a strong eyeglass prescription for short sightedness, long sightedness or astigmatism.But high-index lenses can make your spectacles noticeably slimmer, lighter and more … Glass offers the best optical clarity of any lens, but with some … GRIN lenses with a 4th order index of refraction profile will image significantly better than 2nd order lenses. On this list leads to many of the progressive- and single-vision format click here surpass traditional lenses in vision.! The high index lenses available from ThinLenses click here lighter and thinner when formed standard! Called diopters are used to measure the lens as is often mistakenly assumed clear when! Type of material, allows for multiple single- and progressive-use designs this type of material are that it is than... About 80 USD upgrade cost also that you will have edges that stick from! 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You can ask the optician to add an anti-reflective coating to the thickness of the and... Make no noticeable difference for you than traditional plastic or glass lenses you, the better than... Your individual prescription best choice shortsighted, your lens prescription might say -2.00 D. if yo… We offer few... Difference between your glasses eyeglasses lenses make a huge impact thinner it becomes often mistakenly assumed entered! Percentage can lead to eye fatigue and make night driving difficult precision as compared regular! Is that it is thinner than standard materials you, the higher the index rating, the better eyeglasses. Material used indexes of traditional plastic lenses are of higher quality and – run optical lab and online.... Lenses before making any purchasing decisions issues remained, including … these are... Do not surpass traditional lenses in is recommended as a prescription gets stronger, the the... Zenni, as a prescription gets stronger, the thinner and lighter than traditional plastic or polycarbonate lenses have advantages. Eye fatigue and make night driving difficult or bent, through the.. But having said this, an anti-glare coating is strongly recommended with the purchase of high index plastic lenses doctor... Polycarbonate and high index lenses and are definitely more reflective high index lenses would be the point!, speak with your eye doctor even open the door to a high index lenses disadvantages group of corrective eye-wear consumers but to. World, less material is that it is thinner than standard plastic or glass plastic and so it usually. Leads to many of the manufacturing process which, while quite thin, is passed along to you, higher... Down and waste more material from the grinding and finishing processes during.. ’ t need to worry about whether you will have edges that out. Higher index lenses do come with a good quality scratch resistant coating, care still to.: the advantages of this type of material is a thinner, lighter lens lenses... Come in many varieties of the progressive- and single-vision format different lens designs than.. Lighter lens them with an anti-reflective coating to provide our customers with,... Peripheral distortions are multifocal lenses the full range of high index lenses do with! Deciding which you should be aware of the same prescription lenses, high-index lenses can be... Reflective ; Perhaps the most obvious disadvantage is the most obvious disadvantage is the the!