Aspherical lenses have a complex surface profile that eliminates distortion and can replace multiple lenses, making systems smaller and lighter. They are commonly used in photography, eyeglasses, and contact lenses. Aspherical eyeglass lenses are more expensive to manufacture than conventional types but provide a more aesthetically pleasing appearance. They are also thinner and lighter, making them suitable for correcting severe farsightedness or nearsightedness. Aspherical lenses can be manufactured by stamping, and they are commonly used in point-and-shoot cameras and cell phones.
Aspherical lenses are all lenses whose surface angles and profiles are neither part of a sphere nor a cylinder. Conventional lenses have the same curve throughout their surface, like a ping-pong ball. Aspherical lenses achieve the same amount of refraction but are flatter and thinner.
These lenses are commonly used in photography, as well as eyeglasses and contact lenses. In the context of photography, the complex surface profiles of lenses can eliminate the distortion of some types of lines, compared to a conventional lens. A single aspherical lens sometimes has the ability to take the place of a more complex system of multiple lenses. This allows lens systems to be smaller and lighter, as well as costing sometimes less.
One of the most common uses of aspherical lenses is in vision correction. When used in eyewear, they are much thinner and lighter than traditional lenses. This gives a more aesthetically pleasing appearance, which is a concern for most eyeglass wearers. These lenses do not provide significantly better performance than traditional lenses, but there is no compromise in the quality of vision. Unlike photographic lens systems, aspherical eyeglass lenses are more expensive to manufacture than conventional types.
The relatively flat profile of aspherical lenses is especially noticeable when the lenses correct severe farsightedness or farsightedness. Ordinary lenses are much thicker and bulge in the middle, sometimes causing embarrassing enlargement of the eye for those with farsightedness. However, these problems are greatly reduced by the use of aspherical lenses. One of the few disadvantages of this type of glasses is that the lenses tend to be positioned closer to the face, which can lead to visible reflections on the front and back of the lenses. Applying an anti-reflection coating to these lenses is therefore recommended by many ophthalmologists.
It is possible and very common for aspherical lenses to be manufactured by stamping, and these are very cheap and work reasonably well. They are commonly made for point-and-shoot cameras and are also part of the cameras that often get built into cell phones. The laser that reads data in a compact disc player is also refracted through a patterned aspherical lens. Contoured lenses are all small, while larger ones need to be ground and polished. There are many methods of doing this, with varying degrees of accuracy, depending on the use of the lens.
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