Most people are not aware of the difference between spherical and aspheric lenses. This is one of the biggest mistakes made by the people planning to buy a new pair of glasses.
Nowadays, almost every optician will provide you with an option to buy a lens that has been customized for your eye prescription. This is because most people have astigmatism, a condition where the cornea and the lens do not produce a clear image on the retina of your eye. In such cases, the best way to cure the problem is to customize the lens to the shape of your eyes and give you a clear vision. The Plano optics and spherical lenses can be found at pfgoptics.com.
I am going to tell you the difference between spherical and aspheric lenses. If you understand the difference, I am sure you will make an intelligent decision regarding lens selection. I would say 90% of astigmatism people need spherical lenses, and only 10% of them need aspheric lenses. The other important consideration is that aspheric lenses are more expensive than spherical lenses. So, if you are a person with astigmatism, I suggest that you go for spherical lenses.
This kind of lens has a spherical shape, and this is the most common type of lens which can be custom-made for your eyes. This is the cheapest option and also has excellent visual properties. You can see even if you are sitting close to the screen.
This type of lens has an aspheric shape, and they are designed to correct vision problems caused by astigmatism. People who need these lenses should avoid near objects and read print from a distance. These lenses are expensive but give you clear vision.
Difference among them
There are many differences between spherical and aspheric lenses.
First, the spherically shaped lens has a curved surface that is concentric with the lens’s optical axis. Aspheric lenses have different curvatures on their characters, making them capable of correcting aberrations such as astigmatism, coma, distortion, and field curvature.
Spherical lenses can also correct spherical aberration, but they do not correct field curvature. Aspheric lenses come in two varieties: those with more than one focal point (RK-5) and those with no focal point (RK-7).
Now you correctly think about the differences between spherical and aspheric lenses. If you understand the differences, I am sure you will make an intelligent decision when you get your glasses fitted. I hope this information will help you.