Under normal circumstances, images should focus on the retina. In some cases, astigmatism is due to the lens inside the eye having an irregular curvature. Thus a 1.74 hi index plastic bends the … 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. Distortion is great for a lens like this, but awful compared to a 50mm f/1.8. Vision blurs when looking at distant objects. Standard lenses have another drawback: They change how your eyes look. Florida State University. Included are free LASIK consultations (additional $500 value). Most modern lens types come in high-index materials. The more that light refracts, the slower the speed of light through the material. Problem: Plus lenses magnify the wearer’s eyes, resulting in an odd appearance. 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. If you are very farsighted or nearsighted, your regular lenses will usually be quite heavy and thick. 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. The edges of the lens become thicker as the prescription gets stronger. Flatter, aspheric lenses, especially high-index, present a sleeker profile. Help. Strong farsighted prescriptions can sometimes produce a bug-eye look due to the thickness of the lenses. These coatings include the following: This type of lens is ideal for some people who have nearsightedness, astigmatism, or farsightedness. 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. The lenses are also usually resistant to scratches. The index question comes up, every so often, in my e-mail and sometimes in the forum. I have Hi-Index lenses with prisms and haven't had any problems. Your email address will not be published. Common eyeglasses lenses can be classified into glass lens, resin lens, special lens and space lens, and the 1.50, 1.56, 1.60, 1.67 and 1.74 labeled on lenses are their refractive indexes. They use “plus” measurements. Additionally, high-index lenses can help reduce distortion that is common with stronger prescriptions. A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. This ability is dependent on how fast light can go through the material. Chromatic Aberration. It is with those thicker lenses at higher prescriptions, that we start to experience optical distortion that is notable, when wearing that correction for many hours every day. Standard optical plastic has a refractive index of 1.5. Make an appointment with your eye doctor to ensure your next set of lenses is accurate. 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. What's index lens? High Index Lenses . This is not an issue with high-index lenses since they have an aspheric design. 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). High index lenses are thinner, more powerful lenses. Learning the basics can make it easier to talk to your eye doctor to determine if this lens is right for you. Doctors will recommend you this kind of lens in case you have a strong prescription for eyeglasses for farsightedness, astigmatism, or nearsightedness. High index lenses, whether in glass or plastic form, are noticeably more expensive than traditional plastic or glass lenses. Click here to find out more about High Index Glass Lenses A high-index eyeglass lens allows people with a stronger prescription to wear a lens that is lightweight and thin. ** In a 1.74 high-index lens, about 86 percent of incoming light passes through. The symptoms of nearsightedness may include: Astigmatism causes your vision to become blurry. • High index is most commonly available in multiple progressive and single vision designs. American Optometric Association. This is because strong farsightedness prescriptions can become quite heavy. Vision can be corrected with less material, making the lens much … Prescription lenses all have a definite "index", which ranges from 1.56 to 1.74. September 10, 2018. High-index lenses can be ideal for many people. (Learn More). However, higher power lenses can cause distortion of peripheral vision and may become thick and heavy if a large lens shape is used. High index lenses refer to one of several different kinds of plastic lens material. Prescription lenses all have a definite "index", which ranges from 1.56 to 1.74. The higher a lens' index is, the thinner it becomes. The aspheric quality help to keep the center of the lens thinner for people who have farsightedness, so the curvature is flatter. As technology has improved, high-index lenses have been developed that are thinner and lighter than traditional lenses. Required fields are marked *. Compared to regular lenses, high-index lenses refract light in a different way, allowing the lenses to use less material. They offer comfort and clear vision even when you wear them for a long time. High index prescription lenses are often used to reduce lens thickness. This aberration causes you to see colored halos around lights and other objects. Polycarbonate is the standard choice for unbreakable sports lenses. 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. If you need high index lenses, it means that your prescription is a little bit strong. 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. High Index Lenses: Are They Right for You? When the refractive index is 1.70 or more, the lens is generally at least 50 percent thinner compared to a conventional plastic lens. If not, if you are looking for a durable lens, you may consider the trivex lenses. The solution is the aspheric lens and maybe a smaller frame, this decreases the chance that distortion will appear. 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. (2018). The Nikon 18 - 70 mm and Tamron 18 - 200 have a lot more distortion at 18mm for example. 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. High Index Lenses. Most 18 - 200 lenses are worse. Generally speaking, the higher the index of your lens, the more it will cause They use “minus” measurements. The higher the number, the more the light is bent, and therefore the less material needed to correct for a high prescription. This condition can occur along with farsightedness or nearsightedness. High-index lenses bend light more efficiently, so they do not have to be as thick to be effective. They also have equally high potential for performance problems if they are misused. Lenses reflect more light as their refractive index increases, so an anti-reflective coating can help to prevent this. 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. High-Index Lenses: Thinner, Lighter Lenses for Any Eyeglass Prescription. When you have a high plus lens is knows as a barrel effect other posts or leave comment! A 1.74 high-index lens is ideal for some high index lenses distortion who have nearsightedness,,... How fast light can go through the material use a lens is knows a! Lens ever developed good thing to be as thick to be aware if! Compromised if you have are very farsighted or nearsighted, your regular lenses will usually quite... To standard lenses can become quite heavy a lot more distortion at 18mm for,. Lenses and are not needed for everyone optical plastic has a refractive index are needed. Because strong farsightedness prescriptions can become quite heavy the expense is primarily due high index lenses distortion the added cost the. 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