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Home » About Us » Technology Center » About lenses » What is the advantage of Aspheric Lenses?

What is the advantage of Aspheric Lenses?

by Carmen at 6/22/2010 2:17:08 PM

Aspheric Lenses for Better Vision and Appearance

With aspheric eyeglass lenses, thin is in. Advanced optical design technology allows aspheric eyeglass lenses to be made with flatter curves than conventional lenses, giving them a slimmer, more attractive profile.

Conventional lenses have a front surface that is spherical, meaning it has the same curve across its entire surface, much like a baseball. Aspheric lenses, on the other hand, have a more complex front surface that gradually changes in curvature from the center of the lens out to the edge.

Aspheric Lenses and Slimmer Profiles

Most aspheric lenses are also 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.

Aspheric lenses provide a slimmer profile for all prescriptions, but the difference is especially dramatic in lenses that correct high amounts of farsightedness. Lenses that correct farsightedness (also called plus lenses) are thicker in the center and thinner at their edge. The stronger the prescription, the more the center of the lens bulges forward from the frame.

Aspheric plus lenses can be made with much flatter curves, so there is less bulging of the lens from the frame. This gives the eyewear a slimmer, more flattering profile. It also makes it possible for someone with a strong prescription to wear a larger selection of frames without worry of the lenses being too thick.

Eyeglass lenses that correct myopia (also called minus lenses) have the opposite shape: they are thinnest at the center and thickest at the edge. Though the slimming effect of aspheric lenses is less dramatic in minus lenses, it still provides a noticeable reduction in edge thickness compared with conventional lenses for myopia correction.

Superior Optics of Aspheric Lenses

In conventional lens designs, a slight distortion is created when you look away from the center of the lens — whether your gaze is directed to the left or right, above or below

Aspheric lens designs reduce or eliminate these distortions for a wider field of view and better peripheral vision. This wider zone of clear imaging is why expensive camera lenses feature aspheric curves.

A More Natural View of the World — And Your Eyes

Because aspheric lenses have flatter curves than conventional lenses, they fit closer to your face. This is a major benefit for anyone wearing a strong correction.

For strong farsightedness, aspheric lenses reduce magnification of the eye. The eye at left is seen through an aspheric lens. Through a conventional lens, the eye at right appears larger, even though the lens is the same power.

Conventional spherical lenses with a strong prescription for farsightedness cause unwanted magnification. This makes objects appear larger and closer than they actually are. And because this magnifying effect goes both ways, conventional lenses for farsightedness also give the wearer's eyes an unnaturally magnified, "bug-eyed" look.

Conventional lenses for nearsightedness do just the opposite: They make things look smaller and give the wearer's eyes a small, "beady-eyed" appearance.

Aspheric lenses greatly reduce these undesired magnification and minification effects, so the world looks more natural to the wearer, and the wearer's eyes look more natural to everyone else.

Creating the complicated curves used in aspheric lenses makes these advanced lenses a bit more expensive than conventional lenses. But the outstanding cosmetic and visual benefits of these thinner, lighter lenses make them a good investment.

Since aspheric lenses are flatter and positioned slightly closer to the face than conventional lenses, some wearers may notice more reflections off the front and back surfaces of the lenses. For this reason, anti-reflective coating is highly recommended for all aspheric lenses.

This information has been read 820 Times,  without comment.

Related Topics:
  What is the significance of high index lens?
  AR-coating is a must for high index lens!
  What is bifocal lenses?
  Advantages of progressive lenses
  What is Scratch-Resistant Coating?
  What is Anti-Reflective Lens Coating?
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