What precautions should be taken when choosing a frame? With the vigorous development of the eyewear industry, more and more materials are applied to the frame. After all, the frame is worn on the ...
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, ...
When choosing glasses for children, you need to pay attention to some details in terms of lenses, frames, optometry, etc. The following is a specific introduction:
Lens selection
Material: The pref...
Optometric data
Accurate degree: Go to a professional eye institution or optician for optometry to obtain accurate myopia, farsightedness, astigmatism degree and axial position data. This is the ba...
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...
Metal, TR90 and other materials of the sunglasses frame is more durable, the following is the specific analysis:
Metal material
Strong and durable: The metal has high strength and hardness and is n...
