What is the thickness of myopia lenses related to?
What does the thickness of myopic glasses lenses have to do with? As myopia becomes more and more common, myopic glasses have become an integral part of myopia. Everyone wants their lenses to be light and thin so that they are not only aesthetically pleasing but also more comfortable to wear. However, in many cases, the lenses sold are still very thick and unsightly after processing. So how to match the glasses thinner?
1: The curvature of the lens design
Myopic and farsighted lenses are composed of two curvature spherical inside and outside to produce degrees for myopic glasses lenses other data the same case the smaller the outer curvature of the lens the thinner the lens the greater the outer curvature the thicker the lens.
2: Refractive index
Light through transparent media will produce refraction phenomenon, when the light through different media deflection degree is different to produce the refractive index of difference. The refractive index of light in a vacuum is defined as "1", the higher the refractive index of light in other transparent media, the higher the refractive index of optical lenses, the higher the refractive index of lenses, the greater the refractive power per unit thickness, and the thinner the lenses. Currently, the refractive index of glass lenses is generally between 1.523-1.9 and that of resin lenses is generally between 1.499-1.74.
3: Degrees
The factors that affect the thickness of the glasses lenses are the degree of the lenses. We know that myopia is a concave lens, the middle thin next to the thicker the degree of the lens the deeper the thickness of the edge of the lens is thicker, far-sighted or presbyopic lens is a convex lens lens lens edge thin middle thick lens the deeper the degree of the lens the thicker the thickness of the center of the lens.
4: Types of lenses
The thickness of varifocals, polarized lenses, and dyed lenses is thicker than the same other data of ordinary clear lenses. Because the color change lens to avoid color change after the center color light edge color dark general center thickness is thicker polarized lens because the lens middle selenium crystal polarized layer so the lens is also thicker than ordinary lens dye lens because the lens need high temperature coloring to avoid the lens in high temperature diopter change so also thicker than ordinary lens.
5: The size of the frame
Also from myopia lens is concave lens, lens grinding processing before are round embryonic material will be based on the shape of the frame processing grinding if the frame piece type is small and is round polishing lens shape to the concave lens the more the center part of the grinding grinding the more the lens is also thinner and vice versa the larger the lens shape the more square the less polished the lens is also thicker. Farsightedness is the opposite the larger the shape of the lens the thinner the edge of the lens.
These are some of the basic factors that affect the thickness of myopic glasses lenses, there are too many factors that affect the thickness of the lenses together and need to be considered in many ways.