1.60 1.67 1.74 High Index Eye Optical Lens Spectacle Lens

How much lighter are high-index lenses?

The weight of high-index lenses depends on a factor called the specific gravity of the lens material. Basically, this is a measure of how dense the material is.

Some high-index lenses may be thinner than other lenses (due to their higher index of refraction) and yet might be heavier than thicker lenses (if they are made of a material with a much higher specific gravity0.

Generally, if you want the lightest glasses possible choose a lens material with a high index of refraction and a low specific gravity. Good options here are:

• 1.67 high-index plastic lenses

• 1.71 high-index plastic lenses

• 1.74 high-index plastic lenses

These lenses can be less than half the weight of regular glass lenses and 25% to 30% lighter than regular plastic lenses.

Trivex has the lowest specific gravity of popular eyeglass lens materials. This makes Trivex lenses very lightweight and comfortable Though Trivex lenses (index 1.53) may be only 10% thinner than regular plastic lenses, they can be up to 30% lighter.

Lens index range

The refractive index of eyeglass lenses ranges from about 1.50 to 1.80. Lens materials on the lower end of this range will make your glasses thicker. Materials on the high end of the range produce thinner glasses. The difference will be more noticeable the more nearsightedness or farsightedness you have.

Lens materials that have a refractive index higher than standard CR39 plastic (1.50) and regular glass (1.52) are considered high-index lenses. But some high-index lenses are much thinner than others.

Here's a list of the most common lens materials used for eyeglasses. The materials are listed in order from low refractive index (thick lenses) to high refractive index (thin lenses):

• CR39 (standard) plastic - 1.50

• Crown (standard) glass - 1.52

• Trivex - 1.53

• Mid-index plastic - 1.54 to 1.56

• Poycarbonate - 1.59

• 1.60 high-index plastic - 1.60

• 1.67 high index plastic - 1.67

• 1.74 high-index plastic - 1.74

        

WDO (Weihai Dingxin Optical Co.,Ltd) is one of the top ten optical lens manufacturers in China.

WDO 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 sqm and 280 employees. The annual production and sales of Optical lenses are 30 million pieces, and the annual sales have exceeded 100 million for five consecutive years.

WDO is a member unit of CHINA OPTOMETRIC & OPTICAL ASSOCIATION.

Key & Advantage Products:
Single Vision Lens: CR-39; 1.56; 1.60; 1.67;
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

The integrity of the product and the diversity of customer needs complement each other. What we provide is not only technology, sales or product itself, WDO is more concerned about making customers feel our meticulous service and professionalism. So far, WDO products have been exported to more than forty countries and regions around the world.

In the next few years, WDO will continue to optimize and upgrade the production environment and equipment, further optimize the company's management system, give full play to its own advantages, bring better services and value to customers, and help customers grow!
 

03.Packing and Shipping