Where to buyAsphericlensesglasses

Slightly more costly than single aspheric lenses, this lens-type are even thinner and even lighter weight. Ideal if you’re heavily far-sighted and your prescription is stronger than +6.00.

No. Aspheric lenses refers to the lens profile (cross sectional view), whereas high index refers to the lenses refractive index. Unlike single curve (spheric) lenses, aspheric lenses use varying curvatures in their profile. High index lenses denotes the lenses ability to bend light. With the same dioptric strength, high index lenses are thinner than standard index lenses.

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Yes. Progressive lenses (varifocals) feature varying curvatures and thicknesses within the lens, therefore they’re all considered as aspheric. As they provide a spectrum of focal power from the top the lens to the bottom, differing thicknesses are required.

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Thanks to their undulating curves, aspheric lenses reduce the aesthetic magnification of your eyes for a more natural sort of look.

If your prescription is fairly mild, say less than + / - 2.75 dioptres, aspheric lenses won’t be that much thinner. However, they’ll look flatter and sleeker.

However, aspheric lenses are typically made with high index materials to enhance the benefits of thinner, flatter lenses. Lenses over a 1.67 refractive index are often aspheric.Spherical or aspherical denotes the profile of a lens. Spheric lenses use a single curve in their profile, whilst aspheric lenses use varying curves. These varying curves make your lenses thinner and generally flatter which makes them look nicer and prevents your eyes being magnified.Refractive index denotes a lenses' efficiency at bending light. The higher the refractive index, the better it bends light, the thinner a lens can be. In a strong prescription, 1.67 high index lenses will be thinner than 1.50 standard index lenses.Combining aspheric & high indexSay you need a +6.00 Sphere dioptre. High index 1.67 lenses will be thin, but  aspheric high index 1.67 lenses will be even thinner and look visually flatter. As a rule of thumb, the stronger your prescription, the higher refractive index you’ll need.

Near-sighted (-) spectacle lenses are thickest at their edges. Aspheric lenses are less beneficial for minus prescriptions, but they'll still reduce edge-bulk and appear flatter than a spheric equivalent. Ideal for reducing the weight of your lenses overall.

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Spherical lenses are best suited for those with mild prescriptions with a Sphere power of less than +/-4.00 or and Cyl power less than +/- 2.00. As they use a single curvature, they tend to be made from 'stock lenses' which makes them much cheaper and faster to produce and fit to your glasses.

Far-sighted (+) spectacle lenses are thickest at their centre; therefore, the flatter aspheric profile is much more aesthetically pleasing. Flatter and thinner aspheric lenses will fit a broader variety of frames, giving you more choice for your next pair of glasses.

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For more information on finding the best lenses for your needs, check out Banton Frameworks' Guide to Lens Options to explore more lens types and features.

Aspheric lenses are especially beneficial if you have a strong plus (+) Sphere prescription of more than +5.00 dioptres.

Spherical lenses have a consistent curvature across the entire lens surface. This shape is similar to a section of a sphere, hence the name.

Double aspheric lenses (bi-aspheric) are designed for strong minus (-) prescriptions which utilise aspheric curvatures on both their front and rear surfaces. These lenses have an enlarged field of view which provides greater vision and reduced distortion at the edges of your lenses.

Disadvantages ofasphericlenses

Aspherical spectacle lenses use varying curves across their surface to reduce bulk and make them flatter in their profile. Spherical lenses use a singular curve in their profile, making them simpler but bulkier, especially in the centre of the lens.

Example of a + (convex) shaped lens for correcting hyperopia (far-sightedness) in both a spherical and aspherical profile. Notice the flatter and thinner shape of the aspherical lens using the varying curvatures.

Asphericlenses advantages disadvantages

Aspheric lenses are more expensive due to how they’re made. Becuase they use more complex curvatures, aspheric lenses are more difficult to produce than spheric ones, hence their increased cost. (Around 20%.)

Aspherical lenses have a more complex curvature that varies across the lens surface. Unlike spherical lenses, these are flatter and thinner, especially around the edges.

If you’re still unsure, consult with an optician or eyewear professional. They can provide tailored advice based on your prescription, lifestyle, and budget.

If you have a strong prescription, it's best to invest in lenses which helps you see whilst keeping your eyes looking their normal size.