Relevant standard
Ultraviolet protection factor (UPF)
Definition: UPF is a measure of the ability of a fabric or material to block ultraviolet light, and in the case of sunglasses, it reflects 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, ...
With the continuous recovery of the global economy and the continuous changes in consumption concepts, eyeglasses are no longer just a tool to adjust vision. Sunglasses have become an importan...
Effect of refractive index on visual acuity in the aged
Lens thickness
For the elderly with high myopia or farsightedness, it is more appropriate to choose a lens with a high refractive index. The ...
Proper cleaning and maintenance of optical glasses can help maintain their clarity and extend their service life. Here are some common methods:
Cleaning method
Daily wiping: Gently wipe the glasses...
Choosing a lens suitable for children requires a comprehensive consideration of children’s vision, eye habits, age and other factors. The following are some key points:
Select according to vi...
