1.56 photochromic film progressive blue cut HMC AR optical lens wholesale price

1. Blue Cut Lenses

What is the "Blue color light "of digital devises which is said to be the cause of glares, flickers: the shorter the wave length of the light is the more energy it has. The lights with shorter wave length, like ultraviolet rays are said to cause damage to the eyes. Blue color light are lights in the range of visible rays with high frequency. They are lights in-between 380nm to 530nm. (violet to blue lights) They are worried that they may cause damage to the eyes since they have very short wave length like as ultraviolet rays. In our daily life, we are covered with bright lights such as TV, PC monitors and LED lighting.Many of these lights emit a lot of "Blue color light" to emphasis the brightness.

2. Progressive Multifocal Lens

♦. Progressive spectacle lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. 
♦. The lens location of the correct addition power for the viewing distance usually only requires small adjustments to head position, because near vision tasks such as reading are usually low in the visual field and distant objects higher in the visual field.
♦. Progressive addition lenses avoid the discontinuities (image-jumps) in the visual field created by the majority of bifocal and trifocal lenses and are more cosmetically attractive.

3. Photogrey Film