To make high index lenses even more attractive, most of them have an “aspheric” design . This means that, instead of having a round (or “spherical”) curve on the front surface, these lenses have a curve that gradually changes from the center of the lens to the periphery.
Are aspheric lenses the same as high index?
Most aspheric lenses also are high-index lenses . The combination of an aspheric design with high-index lens materials creates a lens that is noticeably slimmer, thinner and lighter than conventional glass or plastic lenses.
Can high index lenses be polarized?
Polarized high index lenses are more expensive than regular high index lenses . ... Polarized high index only exists in 1.67 high index plastic. You will not find it in 1.70, 1.74, or glass high index. It is also only available in Single Vision in high index; you will not find high index polarized bifocals.
Are all polycarbonate lenses aspheric?
Since aspheric lenses are a specific design or shape and not a type of material, you can get high-quality polycarbonate or even Trivex lenses that are aspheric. These can offer improved visual acuity. The biggest pitfall with aspheric lenses is their cost.
What are high index prescription lenses?
What are high-index lenses? High-index lenses are eyeglass lenses that are designed to be thinner and lighter than regular lenses . They are generally recommended for people who have significantly high refractive errors and strong prescriptions for nearsightedness, farsightedness, or astigmatism.
What prescription type do aspheric lenses benefit most?
What prescription type do aspheric lenses benefit most? People with higher order refractive errors, typically +4.00 diopters or more , are ideal candidates for aspheric lenses.
Are aspheric lenses better than polycarbonate?
And because they have a slim profile, aspheric lenses have less lens mass , making them much lighter. Aspheric lenses also provide superior peripheral vision compared with conventional lenses. ... Polycarbonate lenses have a refractive index of 1.59, making them 20% to 25% thinner than regular plastic lenses.
What are the thinnest high index lenses?
1.74 index lenses are the thinnest eyeglass lenses for high prescriptions. These ultra-light lenses are the thinnest kind developed yet, and accommodate the highest prescriptions possible. They’re much thinner and lighter compared to 1.67 index lenses, and offer a certain level of cosmetic value too.
Do high index lenses make eyes look smaller?
We think this is probably where the misconception around them is why people are asking whether high index lenses make their eyes look smaller. The short answer is no, they won’t.
Do high index lenses cause distortion?
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. Often, this same distortion won’t happen with standard lenses of the same prescription strength.
Is polycarbonate better than high index?
Polycarbonate is by far the safest lens available. It’s up to 10X more impact-resistant than high-index lenses and is therefore the ideal lens material for sports protective eyewear and children’s glasses. Polycarbonate is the standard choice for almost all eyewear that requires shatter and/or chip resistance.
Are double aspheric lenses worth it?
Are aspheric lenses better? Aspheric or double aspheric lenses have the advantage of being thinner, flatter and lighter weight than traditional spheric equivalents. This makes them easier to wear in your glasses frame with improved aesthetics due to their sleeker appearance.
What is the difference between spherical and aspheric contact lenses?
What are aspherical contact lenses? By contrast, aspherical contact lenses don’t have a perfectly spherical shape . ... In contrast, spherical contacts have a constant curvature and power across the lens surface. The curvature of an aspheric contact lens deflects light rays in a way that corrects spherical aberration.
Why are high index lenses so expensive?
Why does all of this matter? Ultimately, high index lenses are more expensive than other types of lenses due to their inherent material . The material that is used to produce high index lenses is from a chemical synthetic blend, and the cost to simply produce sheets of the material is high.
Do high index lenses reduce distortion?
High index lenses will cut down the thickness of your lenses significantly , giving them a more attractively thin profile. This will also cut down on the weight of the lenses and reduce the eye distortion effect that comes along with thick lenses.
Are high index lenses clearer?
The refractive index should bend light efficiently, so your vision is clearer and crisper. ... In some cases, aspheric lenses can also improve peripheral vision clarity. You should also look at the different lens treatment options. All high-index lenses will have an anti-scratch coating to improve lens durability.
