Why are the glasses lenses too thick? When matching glasses, everyone wants to get thinner lenses. Thick lenses can affect aesthetics and also have an impact on the wearing experience. There are also multiple factors that affect the thickness of eyeglass lenses. Let's take a look at the factors that affect the thickness of eyeglass lenses together.
1: The factor of degree
The degree is a very important factor affecting the thickness of the lens. Due to the concave nature of myopic glasses, the lenses are thin in the middle and thick around the edges. Generally speaking, the higher the degree of myopia, the thicker the periphery of the eyeglass lenses.
2: The refractive index of the lens
Many people will see that the refractive index is included in the lens parameters. In the case of the same material and degree, the higher the refractive index of the lens, the thinner the lens. So generally speaking, lenses with medium to high refractive index are suitable for those with high refractive index, while lenses with low refractive index are preferred for those with low myopia.
3: Pupil distance and geometric centroid distance of the frame
Generally, the center of the eyeglass frame is larger than the actual pupil distance of an individual, so the center of the lens needs to be moved inward. The center of the lens needs to be moved towards the bridge of the nose, so when installing the eye lens, it is necessary to move the lens inward. The larger the inward movement, the thicker the outer side of the lens.
4: Mirror frame size and shape
Glasses with a frame shape that is slightly circular or elliptical will appear slightly thinner when made. Square or irregularly shaped lenses will appear thicker when made. In general, lenses made from larger frames are thicker than those made from smaller frames. The above are some basic factors that affect the thickness of eyeglass lenses, hoping to be helpful to everyone.
