Asphericmeaning

clariti 1 day contacts are incredibly comfortable and breathable, thanks to CooperVision’s patented AquaGen Technology. These daily disposable contacts also have aspheric optics to deliver clear, consistent vision all day.

Areaspheric lensesbetter

Got a prescription for aspheric contact lenses? Take advantage of our discount prices by ordering your aspheric contacts from Lens.com. Enjoy hassle-free returns, quick shipping, and a 100% money-back satisfaction guarantee when shopping Lens.com

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Avaira Vitality contacts by CooperVision deliver superior visual performance, thanks to aspheric optics. These 1-2 week disposable contacts are also made of a state-of-the-art silicone hydrogel material to ensure a healthy contact lens-wearing experience.\

Disadvantages ofaspheric lenses

A collimated beam of light is defined when every ray within the beam is parallel to every other ray. To produce collimated light you can either place an infinitesimally small source exactly one focal length away from an optical system with a positive focal length or you can observe the point source from infinitely far away. In the real world, neither of these scenarios are possible. In addition, diffraction theory tells us that even if one of these scenarios were met, there would still be some divergence.

Leading manufacturers offer several brands of contact lenses with aspheric optics. Some of the most popular ones include Bausch + Lomb ULTRA, PureVision, PureVision 2, SofLens, Avaira Vitality, Biofinity, Biotrue ONEday, and clariti.

To achieve ideal collimation, the size of the illumination source must be minimized or the focal length of the collimating system must be increased. Note that as you increase the focal length of the system, the system must be physically further away from the source. This means that less light will be captured by the focusing system and overall power in the resultant beam is decreased.

In eyeglasses, aspheric lenses also have flatter curves than conventional lenses, allowing them to fit closer to your face. This is a significant benefit for those with strong prescriptions because conventional lenses with strong prescriptions can have one of two effects. Conventional lenses with a strong prescription for farsightedness make objects appear bigger and closer than they really are, and they give the wearer’s eyes a “bug-eyed” look. Meanwhile, conventional lenses for nearsightedness make objects appear smaller, and they give the wearer a beady-eyed appearance. Aspheric lenses reduce these undesired effects, and they make the wearer’s eyes look natural.

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Asphericlens benefits

Aspheric optics is also thought to reduce spherical aberration — a specific type of optical aberration in which light rays passing through the periphery of the cornea and lens come to a focus at a slightly different location than light rays passing through the center of the cornea and lens. If not corrected, the differences in focus location on the retina lead to decreased image quality.

Bausch + Lomb’s PureVision 2 HD contacts have aspheric optics to deliver clear, consistent vision while reducing halos and glare in low light conditions. These monthly disposable contacts also come with a visibility tint so you can easily spot the lenses in your contact lens case.

Aspheric optics is a lens design with an aspheric (non-spherical) front surface to better match the shape of the cornea and provide improved visual performance.

Biotrue ONEday contacts have aspheric optics to reduce halos and glare, even in low-light conditions. These daily disposable lenses are also manufactured with a revolutionary material called HyperGel, which matches the cornea’s water content to provide all-day comfort.

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Aspherical lens photography

Aspheric lensesadvantages disadvantages

A conventional lens has a spherical front surface, meaning it has the same curve across its entire surface. Think of the surface of a baseball. On the other hand, an aspheric lens has a more complex front surface in that its curve gradually changes from the center of the lens to the edge.

Bausch + Lomb ULTRA contacts are designed specifically for the digital age. Featuring exclusive MoistureSeal™ Technology, these monthly disposable contacts keep eyes feeling fresh and healthy all day. As such, they’re an excellent option for heavy users of digital devices.

Biofinity contacts by CooperVision are monthly disposable lenses that deliver clear, consistent vision, thanks to aspheric optics. These contacts also feature exclusive Aquaform Technology, which locks in water so you can enjoy all-day comfort.

With conventional contact lens designs, some distortion is created when the wearer looks away from the center of the lens, i.e., left, right, up, or down. Aspheric contact lens designs reduce this distortion by creating a wider field of view and giving the wearer better peripheral vision. This is primarily why expensive camera lenses tend to have aspheric designs.

Some level of divergence will always be present when collimating light. In the illustration below, both systems produce collimated light, however, Figures 2 and 4 have more divergence compared to Figures 1 and 3 due to the sources being larger. Figures 2 and 4 can be thought of as a collection of closely spaced ideal point sources. Individually, each point creates a ray bundle of parallel rays, but as a collection the series of “point sources” create a beam with some divergence. The divergence exists because, as the size of the source increases, the source’s distance from the optical axis increases, and thus the resultant ray bundle’s angle increases with respect to the optical axis.

To minimize divergence of a collimated beam two factors must be balanced: focal length of the collimating system and size of the light source. Equation 1 approximates the divergence of a collimated beam: