Add the problem of lens staining, please come in with friends who work in the optical store!

1. There are more general accounting in summer, accounting for about 20%, and in winter, accounting for about 6% 2, it is generally required to dye when buying, and it is rare to say that you can take a lens to let you dye 3, the proportion of custom-made dyed lenses is the same as the first question, the cost is actually not expensive, if you buy ordinary fiber pieces and then dye, the cost is to add 100 yuan dyeing fee, if it is the original dyed lens, the general refractive index is 400 500, imported, of course, there are many cheaper ones. 4. If the general optical store has its own special production department, it can dye it by itself, and if it does not add film, it can be taken back to the manufacturer to help dye, but the technology is not very good, and there will not be many choices for color.

1. Glass lens: stable refractive index, good wear resistance, stable optical properties, blocking ultraviolet rays 290-300nm, but relatively heavy, easy to break. 2 Plastic Lens (CR-39):

Light, safe, high light transmittance, not easy to break, blocking ultraviolet rays above 390nm, but the surface is easy to scratch and wear. 3 pc lenses with a high refractive index and firmness, but easy to wear. Lenses should be chosen according to individual needs, and in general, plastic lenses are better than glass lenses.

CR39 resin lens glass lens 1, light transmittance 92% 91% 2, specific gravity light weight 3, impact resistance test (16 grams of steel ball free falling) 4, crushing situation: crack or large scene, no acute angle. Finely crushed, sharp 5, Yin Broken UV 390mm 290-300mm 6, Refractive index 7, thickness Thicker Thinner 8, Wear resistance:

Glass is generally better than resin 9. Atomization trend Tree reflects better than glass, reducing by 60-75% 10. Dyeing: easy to color Not easy to color 11. Degree of danger: Safety Broken eye trauma -- In our daily life in the high-tech era, we are exposed to computers, televisions and other electrical appliances and electromagnetic wave radiation, so as to become one of the world's three major pollution sources.

The harm of electromagnetic waves to the human body has been discovered by the medical community at home and abroad. Long-term exposure to electromagnetic radiation will cause eye fatigue, lens edema, cloudiness, and severe symptoms such as cataract and cranial neuropathy. Now a new lens adopts a special coating process, according to the principle of electromagnetic interference shielding, the surface of the lens will reflect and absorb low-frequency radiation and microwave to provide a lens that protects the health of vision!