The difference between spherical and aspherical lenses

What is a spherical mirror? What are aspherical lenses? What is the difference between the two? Let's talk about the difference between the two.

A spherical lens has a spherical surface and the radius of curvature of the entire lens is the same. In contrast, the surface of an aspherical lens is more complex, with the curvature gradually changing from center to edge. These design differences can reduce the number of elements in the component and lead to thinner and lighter lenses.

The surface of a spherical lens looks like a part of a sphere or cylinder.

The curve is the same across the entire surface. If you draw a straight line to follow the curve, it will form a circle. Spherical lens designs are often cheaper because of their simplicity.

The surface of an aspherical lens must not be part of a sphere or cylinder. The curve of some parts of the lens surface changes to better focus the light. This change in the surface corrects for various aberrations.

If you want to reduce spherical aberration in the image, you should use an aspherical lens.

What is a spherical lens?

Imagine a transparent sphere with a circle in front of us. The surface of a sphere is a surface called a sphere. A spherical lens represents only one surface of the sphere selected as the lens.

Spherical mirror

What are aspherical lenses?

Literally, it's easy to understand: What is "non"? "No" means "No", so what is an aspherical lens? In fact, this means that the lens is not spherical.

Aspheric lenses in eyeglasses

In terms of appearance, spherical lenses are "big belly", but aspherical lenses are relatively flat, so from an aesthetic perspective, aspherical lenses will look better. Aspheric lenses are thinner and more collision resistant than spherical lenses due to their precise design and optimized lens degree combinations. Therefore, people with higher degrees usually wear aspherical lenses.

When you look at the world through a lens, the differences become more apparent.

From the comparison table, we can see at a glance that:

Deformation occurs when looking around a spherical lens. Due to the aspherical design, aspherical lenses can minimize differences between lens edges. Seeing objects is more natural, less deformed, and more realistic.

Aspheric lenses are so good, why do people choose spherical lenses?

For friends with mild myopia, wearing spherical and aspherical lenses is almost the same, with no aberration problems, and the lens thickness is similar. Considering the price factor, spherical lenses can be selected.