Should I choose spherical or aspheric glasses_

Should I choose spherical or aspheric glasses?

For eyewearers, do you know the difference between spherical and aspherical lenses? Which type of lenses should we choose when fitting glasses? Recommended reading:Spherical and aspherical lensesWhich people are suitable for spherical lensesCharacteristics of spherical lensesSpherical lenses refer to the fact that the inner and outer sides of the lens are spherical, or one side is spherical and the other side is flat (as if a part of the spherical is cut from the sphere), which is the spherical lens. But the spherical surface also has shortcomings, and it will suddenly dawn on the friends who wear glasses. Disadvantages of spherical lenses: the surrounding objects will be distorted (the higher the power, the more obvious), the aberration and deformation will increase, and there will be obvious unclear images, distortions, narrow fields of vision and other undesirable phenomena, which will limit the wearer's vision and the authenticity of vision. Therefore, in order not to distort the vision, we humans have developed aspherical lenses. Characteristics of aspherical lensesIn order to prevent the lens from being deformed, it is necessary to change the curved surface of the lens, and it is according to this design principle that the aspherical surface minimizes the aberration of the edge of the lens, corrects the spherical image, and solves the problems of vision distortion. So what are the specific benefits of aspherical lenses over spherical lenses? 1. Small visual discoloration: aspherical lenses make up for the biggest disadvantage of the spherical surface - visual deformation. 2. Realistic vision: aspherical lenses use a variety of curvature radii on the convex surface of the lens, which can obtain the same visual effect as emmetropic eyes compared with spherical lenses, making the vision more realistic, natural and comfortable. 3. Lenses are thinner and lighter: Since the curvature of aspherical lenses decreases, the thickness of the lenses will be relatively reduced. In the case of the same power, it is about 50% thinner than the spherical lens and the farsighted lens; Myopia lenses are about 20% thinner, and non-spherical lenses are lighter, thinner, and flatter than spherical lenses at the same power. 4. The gospel of high myopia: in the case of high diopter (above 500 degrees), aspherical lens will see more real and natural, the field of view will be wider, and it can also reduce the visual fatigue induced by visual deformation. How can you tell the difference between aspherical lenses and spherical lenses? 1. Brush your hand from the center point of the lens to the edge, you will feel very flat, if you have the above feeling, it should be an aspherical lens; 2. Look at the shape of the lens coating against the lamp, generally the lamp reflected by the spherical lens is straight (except for high diopter lenses); Aspherical lenses have a large curvature due to the different curvatures of various parts of the surface. So do you know how to choose the right lens for you?