In the discussion of “What is the optical refractive index of an eye lens?” When it comes to this problem, we first need to understand the physical concept of optical refractive index, ...
Lens material
Glass lens
Functional advantages: Excellent optical performance, can provide clear and accurate visual effects, high refractive index, can effectively block UV and some glare. Its har...
Titanium sunglasses frames have the following significant features:
Light weight: The density of titanium is about 4.51g/cm³, which is much lower than common metals such as copper, iron, steel, etc...
Round face
Style selection: Suitable for the choice of square or rectangular sunglasses, through the angular shape to increase the three-dimensional sense of the face and the sense of line. Avoid r...
1. Nose pads
Different from adults, children’s heads, especially the angle of the nose peak and the curvature of the bridge of the nose, have more obvious differences. Most children have...
Product characteristic class
The principle and application of polarized sunglasses: mainly involves how the polarized lens filters the light in a specific direction, reduces glare, and the practica...
