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 daily life, many people need to rely on glasses to correct vision problems, but with the arrival of summer, the sun glare, sunglasses have become an essential single product to protect the eyes ...
What is the difference between resin lens and pc lens, which is good?
Resin lens and PC lens as the two mainstream materials of modern eyeglass lenses, each has its own unique characteristics and a...
When choosing eyeglass lenses, consumers often hesitate between high-definition lenses and anti-blue lenses. These two lenses have their own advantages and are suitable for different use scenarios ...
Polarizers are manufactured according to the principle of polarization of light. We know that when the sun shines on the road or water, it directly irritates the eyes, making the eyes feel...
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 ...
