Semi Finished 1.56 Flat Top UV420 Anti Blue Ray Hard Multi Coated Optical Lens Blanks

Material: 1.56 Index NK55 Resin(Ne=1.549, Abbe=38, Specific Gravity=1.28)

Segment Placement: 5mm down -5mm in

Add Power: +1.00 to +3.50 in 0.25D steps

Segment Size: 28mm

Bifocal glasses are used for many reasons, but the most common reason is Presbyopia. Presbyopia is a vision condition in which the crystalline lens within the eye looses its flexibility thus hampering the ability to focus. One may need a multifocal lens simply due to age. On an average, once you hit 40 you may became a good candidate for these lenses, although you may require multifocal lenses at a much earlier or later age and for other reasons as well. Always get your eyes checked for vision and eye health reasons.

A flat top 28 bifocal lens is offers correction for both near and far distances. IThe flat top lens includes a segment at the lower half of the lens with a prescription for reading (near distance). The width of the flat top 28 bifocal is 28mm wide at the top of the bifocal and looks like the Letter D turned 90 degrees.

Blue light is a form of visible light with a wavelength in the range from 380nm to 500nm. It has a very short wavelength, and so produces a higher amount of energy. Studies suggest that over time exposure to the blue end of the light spectrum could cause serious long-term damage to eyes.

Nowadays, we spend more time using a wide variety of digital devices to work, learn and be entertained. Recent digital screens are often equipped with powerful light source such as LED. These digital screens emit intense blue light and can cause eye strain after long exposure.

Blue Cut Lenses have a special coating which reflects blue light and prevents it from passing through, allowing wearers to enjoy the added benefit of clearer and sharper vision, without altering or distorting color perception.

color envelop with customer design

weight: 157g size: 9*9*9cm

1.We are a manufacturer with many years exporting experience. All lenses are exported to European countries, Japan, Korea, North and South America, Middle East, Southeast Asia and Africa market. We guarantee the quality to all buyers all over the world, and got a high reputation about quality from buyers in the past 8 years exporting time.

2. We will begin to track the product processing every day until you receive the goods and verify the product quality when you finish the payment.

You could contact us via Internet chat tools anytime, for example Skype, Whatsapp.

3. Our producing process is in vacuum dust-free shop, like prepare material, mixed material and take out .Four times quality checking during production process to contral lens quality.

4. We accept OEM &ODM orders. Actually most of our products are customized. We will try our best to fulfill your requirements about the material, the size and the printing.