What is blue light?
Sunlight contains red, orange, yellow, green and blue light rays and many shades of each of these colors, depending on the energy and wavelength of the individual rays (also called electromagnetic radiation). Combined, this spectrum of colored light rays creates what we call "white light" or sunlight.
Generally, scientists say the visible light spectrum comprises electromagnetic radiation with wavelengths ranging from 380 nanometers (nm) on the blue end of the spectrum to about 700 nm on the red end. (By the way, a nanometer is one billionth of a meter - that's 0.000000001 meter!)
Blue light generally is defined as visible light ranging from 380 to 500 nm. Blue light sometimes is further broken down into blue-violet light (roughly 380 to 450 nm) and blue-turquoise light (roughly 450 to 500 nm).
So approximately one-third of all visible light is considered high-energy visible (HEV) or "blue" light.
Blue Cut Lenses
Blue cut lenses feature a special coating that reflects harmful blue light and restricts it from passing through the lenses of your eyeglasses. Blue light is emitted from computer and mobile screens and long term exposure to this type of light increases the chances of retinal damage. Hence, wearing eyeglasses having blue cut lenses while working on digital devices is a must as it may help in reducing the risk of developing eye related problems.
Our Blue Cut Lenses' Advantages
Our blue cut lenses can effectively prevent blue light radiation.And the lenses are of good quality and are not easily broken.
Product Specifications:
| Specifications |
Index |
1.56 |
| Design |
SPHERICAL |
| Material |
NK-55 |
| Vision Effect |
SINGLE VISION |
| Photochromic |
NO |
| Abbe Value |
38 |
| Specific Gravity |
1.28 |
| Transmittance |
98-99% |
| Abrasion Resistance |
6-8H |
| Multi color |
BLUE |
| Diameter |
65/70MM |
| Coating |
HMC |
| Payment& Shipping Terms |
Port |
FOB Shanghai |
| MOQ |
500 Pairs |
| Supply Ability |
10000 Pairs per Day |
| Payment |
T/T 30% before production, balance before shipment. L/C is also acceptable. |
| Packing |
Envelops ( for choice):1) standard white envelops |
| 2) your design with your logo, need extra charge |
| Main Features |
Passed the impact resistance test of FDA Drop ball test |
| 1 year quality guarantee. |
Our Factory:
WDO (WEIHAI DINGXIN OPTICAL) is one of the most Potential Finished and Semi-Finished Optical Lenses factory located in Weihai City, China. It was establish in 1998 with covering 24400 spm and 280 employees. The annual production and sales of lenses are 30 million pieces, and the annual sales have exceeded 100 million for five consecutive years.
Our Key & Advantage Products:
Single Vision Lens:CR-39;1.56;1.60;1.67;1,74
Bifocal Lens: CR-39; 1.56;1.60
Progressive Lens: CR-39; 1.56; 1.60
Functional Lens: Blue Cut, Photochromic; Photomagic +UV420cut, Polarized; Polycarbonate
RX Service: Free Form; Special Coating; Special Power Range
Optical Equipment;Frames
Packaging and Shipping:
We can customize packaging bags with exclusive LOGO according to the requirements of each customer, and choose suitable transportation methods for customers.
Audited Supplier 
){kind=link}
){kind=link}