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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. The benefits of high index lenses are hard to overlook. Polycarbonate Lenses Advantages & Disadvantages. These disadvantages are as follows: Less availability. You can create a mind map like this effortlessly. And in the eye-wear world, less material is a huge advantage. The refractive indexes of traditional plastic lenses and glass lenses are about 1.5 and 1.52 respectively. Map Outline High index lenses Refractive Index . Contact lenses are thin discs of plastic or glass that sit directly on your eye to correct … Any lens material with a refractive index higher … DISADVANTAGES OF HIGH INDEX LENSES Price. Zenni, as example, sells very high index lenses (1.74) for about 80 USD upgrade cost. 48%. For the full range of High Index Lenses available from ThinLenses click here. 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. 1. Higher cost; Abbe value; More brittle and reflective; Perhaps the most … High index lenses are made from a chemical synthetic blend that's created through a special manufacturing process. The higher the index rating, the less material required to make a lens in a particular prescription. 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). Units called diopters are used to measure the lens power necessary to correct refractive errors. 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. Abbe value, which is a measurement of lens distortion, is also increased in high index lenses. You don’t need to pursue additional coatings. 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. 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. • Mid index – 1.54 to 1.63. 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. 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. High index lenses reflect a considerably higher percentage of light than standard lenses. Before purchasing new lenses, discuss the advantages and disadvantages of high-index lenses with your eye doctor. More Brittle Before choosing high-index, speak with your eye doctor to determine if these lenses are necessary for your individual prescription. High-index lenses may be just the solution you have been searching for. According to your prescription, you needn't use 1.6 index lens. Eyeglasses are easy. Compared to conventional lenses, high index lenses are much thinner and lighter. But having said this, high index lenses are of higher quality. Your eyeglass prescription also determines what kind of high-index … 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. For instance, a high-index progressive lens might cost $350, whereas you might pay $310 for a high-definition progressive lens. These types of lenses are thinner and lighter than conventional lenses; however, high index lenses do come with a downside. Your email address will not be published. High-index materials are denser than lower-index polycarbonate, which means they result in thinner lenses in order to refract light accurately. High-index lenses can also be used to improve the fit of lenses in the frame. 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. The Disadvantages of Choosing High Index Lenses for Your Sunglasses. Reduced Light Transmission Unless you're talking about sunglasses, the more usable light that passes through a lens, the better. The lenses are a high-index plastic material. Even with a good quality scratch resistant coating, care still needs to be taken as plastic lenses are easier to scratch. By their very nature and chemical makeup, high index lenses have distinct advantages over standard plastic or glass. • Very high index – 1.74 to above. If you do choose to buy frames with high-index lenses, then you should always pair them with an anti-reflective coating. If you want to get high index lens, you can ask the optician to add an anti-reflective coating to the lenses. 3 Duplicate. So, they are the idea choices for people with strong prescription. Also, generally speaking, the higher the index, the higher the cost of the lenses. Thinner, lighter and more expensive than mid-high index or hard … With an antireflective coating, you can solve this problem. Compared with traditional lenses, highly index lenses can bend the light more efficiently, so they can be thinner while maintaining the same correction power. Different b/t high index lens and regular lens. Here are some advantages of polycarbonate lenses: Durable, providing extra safety to your eyes and promoting better eye health; 10 … But the optician reckons they're superior lenses? If you are already at -2.00 diopters or less, spending the extra money will make no noticeable difference for you. Good for prescriptions over +/-8.00. Nevertheless, one of the more important choices that you will have to make focuses on your lens material. High Index Material Disadvantages. Polycarbonate is more common in different lens designs than Trivex. Hi, My prescription is -0.75 sph and -0.1 sph. The suggested prescription range is +/-4.00 to +/-8.00 sphere. 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. You can create a mind map like this effortlessly. It refers to the type of … Though it is expensive, it worths. Another type of lens that can cause peripheral distortions are multifocal lenses. Our goal is to provide our customers with affordable, top-of-the-line prescription safety and prescription eyewear. Disadvantages of Double Aspheric 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. A higher Abbe value means less distortion, a lower value equates to more distortion. Lens cost varies significantly depending on the retailer, but expect to pay anywhere from $25 – … Finally, high index lenses can be more brittle and are definitely more reflective than standard materials. Answer: The advantages of this type of material are that it is thinner than standard plastic and so it's usually lighter. 5. So while the thinner, lighter high indexes offer cosmetic benefits, they do not surpass traditional lenses in vision quality. Lenses made from Trivex cannot offer the same degree of thinness as high-index lenses. Learn the pros and cons of Trivex lenses. The added costs are because high index lenses simply cost more to produce. This ensures more comfortable glasses even if your farsightedness, nearsightedness, or astigmatism prescription is high. Ratio of velocity of light in vaccum to in optical medium ; Normal index n _> 1.48 but <1.54 ; Mid index n _> 1.54 … up. They use “plus” measurements. If you are already at -2.00 diopters or less, spending the extra money will make no noticeable difference for you. Negligible Benefit 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. The manufacturing process is more complicated and requires more precision as compared to other types of lenses. A thick standard glass or plastic lens will have edges that stick out from behind your frames. Advantages. According to your prescription, you needn't use 1.6 index lens. The lab didn't have any 1.5 index lenses in stock so stuck 1.6 index lenses in. How are they made? They offer comfort and clear visioneven when you wear them for a long time. What are the advantages and disadvantages of high index spectacle lenses? In addition to this, hi index lens materials can also cause a distortion of peripheral vision. 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. Anti-reflective coatings allow 99.5 percent of available light to pass through the lenses and enter the … As the same suggests, this coating helps in reducing excessive reflections and … High index lenses offer extra visual correction. 1.67 vs 1.74 High Index Lenses – What You Need to Know. Required fields are marked *. It is a sturdy, high-quality, very clear plastic that works well for prescription glasses. 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. Regular Lenses vs. High-Index Lenses . … High-index lenses are more efficient in bending light and correcting for refractive errors, and so the result is a thinner, lighter lens. Disadvantages: At least twice the weight of plastic or polycarbonate lenses. 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.. Thinner high index lens edges allow for greater flexibility in frame style. The technical definition for high-index lenses is any lens with a refractive index higher than 1.523. 1 Prescription range is an important factor. If you have a very slight corrective prescription, you might not enjoy much of a boost here; however, the stronger your prescription gets, the more benefit you’ll receive. Compared with traditional lenses, highly index lenses can bend the light more efficiently, so they can be thinner while maintaining the same correction power. 4. Consider also that you will likely not wear those glasses for more than a few months, if you are working on vision improvement. The Advantages of High Index Lenses. High-index glass is an option in some situations but will not be addressed in this article. And because AR coating virtually eliminates lens reflections, it makes high-index … We offer a few different indexes on our lenses. The benefits of high index lenses are hard to overlook. The particular thinness found in high-index lenses reduces the “coke bottle” appearance and is ideal for those in need of high visual correction. Disadvantages of high-index lenses. Take Away High Index Lenses Lenses with high indexes can be thinner and lighter than traditional plastic lenses. 3. Abbe Value Higher Cost High Index Lenses Disadvantages. • Normal index – 1.48 to 1.53. Refractive errors and lens powers required to correct them are measured in units called dioptres (D). 1.74 High Index Lenses. Later, plastic materials such as acrylic and polycarbonate entered widespread use as medium refractive index materials for eyeglass lenses. Your eye doctor can also provide more information on any specific questions you may have. And when the subject is eyeglasses, weight and thickness can mean a lot. Require a special coating to provide 100% UV protection. 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. Save my name, email, and website in this browser for the next time I comment. And opted for bog standard 1.5 index mutilcoated lenses. While most prescriptions are compatible with more than one specific index, it's up to you to decide which one fits your personal needs! Reduced edge size also relates to the thinness of the high index lens. But they don’t block all damaging sunlight. • High index – 1.64 to 1.73. Glasses, Buying glasses. Rx-Safety.com is a family-owned and – run optical lab and online store. 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. A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. The higher a lens' index is, the thinner it becomes. The difference between your glasses' lens index can make a huge impact. 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. 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. Our goal is to provide our customers with affordable, top-of-the-line prescription safety and prescription eyewear. Can shatter or chip easier than lenses made of other materials. This means that stronger prescriptions are lighter and thinner when formed from high index material. The “Abbe Value” is a measurement of lens distortion. Lens index is a number that describes how thick or thin your lenses are. 1. If you are mildly shortsighted, your lens prescription might say -2.00 D. If yo… Compared to regular lenses, high-index lenses refract light in a different way, allowing the lenses to use less material. Buy High Index Lenses. So, they are the idea choices for people with strong prescription. So we’ll examine the two most common lens materials here and present the advantages and disadvantages you should be aware of. With so many lens materials and lens treatment combinations available, knowing when to recommend one high-index lens versus another can seem like a numbers game. At the same time, there is less need for high index, if you have a very low prescription. One of the most obvious disadvantages is the fact that high index lenses tend to cost more than other types of lenses. Many eye care professionals also recommend adding anti-reflective and anti-scratch coatings to high-index … Spectacle lenses correct refractive errors by bending (refracting) light as it passes through the lens. However, That not means the higher the index of the lenses, the better the eyeglasses lenses. … It is more expensive than polycarbonate. They're lightweight and stylish, but are mostly reserved for those with higher vision correction needs. Index 1.5 lenses are … Glass offers the best optical clarity of any lens, but with some … The following are the advantages of anti-radiation prescription glasses.. 1. 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. It’s named after German physicist and mathematician Ernst Abbe, who discovered that different materials yield different levels of chromic aberration. Once you get close to … Trivex … We offer a few different indexes on our lenses. More Reflective The higher a lens' index is, the thinner it becomes. By choosing these lenses you won’t need to worry about whether you will be able to see clearly. High index lenses have a lower Abbe rating than identical prescriptions formed from standard material. Lenses with a high refractive index are more costly to make. For stronger prescriptions, the overall result will not be as thin as Glass High Index Lenses. HI INDEX The term “hi index” refers to the lenses whose index of refraction is higher than 1.49 in plastics and more than 1.523 in glass. The Disadvantages of High Index Lenses. The most obvious drawback of high index lenses is their cost. Loading High index lenses 1010111770li Nov 8, 2015 . watch the video. 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. Although thinner the new 1.6 lenses seem to not be as optically good as my other pair of 1.5 lenses. Deciding which you should get depends on … Advantages . Lenses with an index of refraction of 1.70 or higher typically are at least 50 percent thinner than conventional plastic lenses. Tags: others product Similar Mind Maps Outline up. What are the advantages and disadvantages of high index spectacle lenses? For the same prescription lenses, the higher the index, the thinner and lighter the lenses are. The inherent makeup of the lenses that you choose for your new pair of prescription glasses will have a significant impact on how … © RX Safety - Developed by ISEA Media & Cosmick Technologies. Trivex is a material developed for military purposes. Our polycarbonate lenses have a 1.59 index which, while quite thin, is more focused on durability than lightness. Prescriptions require higher index results in less use of material are that it is than... Indexes offer cosmetic benefits, they are the advantages and disadvantages of index. Lens requires 2 millimeters of material, allows for multiple single- and progressive-use designs don! 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