Do you know what is Double Aspheric Lenses?
Do you know what is Double Aspheric Lenses?
Double Aspheric Lens——Simply put, both the outer and inner surfaces of the lens are "aspherical". These lenses are popular for the strong prescriptions to reduce thickness at their centres or edges.
They are available in Single Vision Lenses for the correction of nearsightedness, farsightedness and astigmatism, also good in progressive lenses, bifocals and trifocals for presbyopia.
I.What is the difference between double aspheric and other lenses?
Spheric lenses：Single curvature on front and back surfaces
Aspheric lenses：Irregular curvature on front surface.
Double aspheric lenses：Irregular curvature on front and back surfaces.
☆Through compound surface compensation technology, it achieves more extreme edge thinning and aberration correction than a single aspherical surface, making it flatter, slimmer and more stylish in the frame.
II. What are the significant advantages of double aspheric lenses?1.Optimized Thickness:
Compared to traditional spherical lenses, the double-asp design reduces the edge thickness of 800-degree myopia lenses by over 40%. This reduces the perceived bulk of the lens, improving both wearing comfort and aesthetics.
2.Optical performance:
Eliminates the residual astigmatism problem of single-asp lenses and improves field of view clarity by 30% (Zeiss laboratory data).
3.Astigmatism optimization:
When there is an astigmatism problem, the double-asp can perform targeted optimization of the astigmatism, effectively reducing the distortion rate caused by astigmatism when viewing objects from the edge of the lens.
4.Adapting to the situation of uneven degree:
As a concave lens, the double-asp lens has the characteristic of smaller reduction rate, which makes it perform well when dealing with the situation of uneven degree. It can make the objects seen by both eyes closer in size, greatly alleviating the visual discomfort caused by the difference in degree.
III.What prescription type do double aspheric lenses benefit most?
Double aspheric lenses are especially beneficial for strong plus (+) prescriptions with Sphere powers of more than +6.00.
☆If you’re strongly farsighted (+) double aspheric lenses will reduce lens-bulk in the centres of your lenses due to their convex profile.
☆If you’re strongly nearsighted (-) double aspheric lenses will reduce lens-bulk at the outer edges of your lenses due to their concave profile.
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