The difference between spherical and aspheric lenses: a spherical lens refers to a constant curvature from the center to the edge of the lens, while a non-spherical lens has a continuous curvature from the center to the edge. Spherical lens refers to a corrective lens with the same radius of curvature on the surface of the lens, like the cross section of a sphere. An aspheric lens refers to a corrective lens in which the central area of the lens is designed with a spherical surface, and the curvature of the lens is gradually changed at a certain rate from a specific position from the optical center. The radius of curvature of the surface is inconsistent.
The "curvature of the spherical surface" of the spherical lens is constant, that is, the front and back surfaces of the lens are part of the spherical surface respectively. Each surface can be convex (convex outward from the lens), concave (recessed into the lens), or "flat" (flat). The line connecting the spherical center points of the front and rear surfaces of the lens is called the optical axis of the lens. In almost all cases, the optical axis of the lens passes through the physical center of the lens. The radius of curvature of the aspheric lens changes with the central axis, which has a better radius of curvature and can maintain good aberration correction. Surface curvature is one of the differences between spherical and aspheric lenses.
The difference between spherical and aspheric lenses in design: The main parameters considered in the design of spherical lenses include refractive power, refractive index, center thickness and base curve. Base curve usually refers to the refractive power of the front surface of the lens. For a given refractive power, the choice of base curve is very important for the optical imaging quality of the lens. The design of flat base curve can improve the appearance of the lens, reduce the thickness of the lens, control the magnification of the lens, and reduce the weight of the lens, but it will increase the aberration of the lens. In order to retain the advantages brought by the flat base curve design, an aspheric design can be used to eliminate the increased aberrations.
The difference between spherical and aspheric lenses: Aspheric lenses are used to replace spherical lenses. The most significant advantage is that they can correct the spherical aberration caused by the spherical lens in the collimation and focusing system. By adjusting the surface constant and the aspheric coefficient, the aspheric lens can eliminate the spherical aberration to the greatest extent. The aspheric lens basically eliminates the spherical aberration produced by the spherical lens. At present, the main processes of aspheric lenses are: precision glass compression molding, precision polishing molding, hybrid molding, and injection molding.
When it comes to choosing a lens for your eyewear, it is important to consider the type of lens. There are two types of lenses you might want to consider: an aspherical or a spherical lens. There is a difference between the two, and you might like to know what that is. It is also interesting to compare the two types, thus discovering the importance of an aspherical lens vs. spherical lens.
An aspherical lens helps to reduce distortion, thus creating clearer vision. It eliminates optical imperfections such as curvature and chromatic distortion. The distortion is eliminated because the lens does not have any spherical shapes and is, therefore, flatter and thinner.
A spherical lens refers to the lens profile. This particular type of lens has a single curve that runs across the entire lens. These lenses are, therefore, also called singlets. The focal part of the lens is, therefore, dependent on the distance from the center area of the lens. This can lead to optical distortions.
A spherical lens has a single curve that can make it bulkier and thicker than an aspheric lens. It can also, at some point, magnify the eyes, making it visually unappealing. It also adds weight to the overall eyeglass frame. With an aspherical lens, the lens can have varying curvatures. That is why the lenses can be flatter and thinner than spherical lenses.
Furthermore, the aspherical lens can be used in multi-focal or multi-vision eyeglasses because it can have varying curves. One could sum up the main differences between a spherical lens and an aspherical lens, that is, aspherical lens vs. spherical lens, as follows: the spherical lens is prone to distortion, and the aspherical lens can provide clearer or crisper vision.
Another difference is that aspherical lenses are more expensive than spherical lenses. The reason is that the manufacturing process requires more accuracy and precision. Aspherical lenses are, therefore, more difficult to make as opposed to the simpler spherical lenses.
Finding the right aspherical or spherical lenses is easy when you have online optical services. This service offers a wide range of eyeglasses that could help you decide on the right choice between an aspherical lens vs. spherical lens. The most important consideration here is to look at the difference in cost between the two options.
Included in the options is also the consideration of the size of the eyeglass frame. One might consider that the spherical lens, because of its nature, might require larger but lighter frames.
You might opt for a frame such as Eirik that would allow for a wider vision.
Goto RuiQi to know more.
Even so, you should check whether the glasses fit your face shape. The oval shape, of which Eirik is an example, is a universal shape. Another frame that you could opt for is the larger Minda frame. Both frames are lightweight and will allow any curvature. The lenses would definitely be less costly than the aspherical lenses.
Finding the right aspherical lens vs. spherical lens is much easier. In this instance, there is no need to be as careful in choosing a frame. However, once again, you should take the shape of your face into consideration.
If you can wear rectangle glasses with ease, you should not even have to think twice about looking at Laelia to use with your aspherical lens.
The same applies to Azalea as below. In both of these examples, adding your aspherical lenses will not add any weight to your frame, even if you require multi-vision lenses. The only downside to aspherical lenses is that they are more costly than spherical lenses.
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