1. Benefits: Polarized lenses reduce the glare of light around us, whether it is coming directly from the sun, from the water or even snow. Our eyes need protection when we’re spending time outside. Typically, polarized lenses will also have built in UV protection which is extremely important in a pair of sunglasses. Ultraviolet light can be damaging to our vision if we are exposed to it frequently. The radiation from the sun can cause injuries that are cumulative to the body that could eventually lead to reduced vision for some people. If we want to experience the maximum potential improvement to our vision, consider polarized lenses which also contain a feature which absorbs HEV rays. The first benefit of polarized lenses is that they provide clearer vision. The lenses are built to filter bright light. Without the glare, we will be able to see much clearer. In addition, the lenses will improve the contrast and visual clarity. Another benefit of polarized lenses is that they will reduce our eye strain while working outside. As mentioned before, they will minimize glare and reflection. Lastly, polarized lenses will allow for the true perception of colors that we may have not been getting with regular sunglass lenses.2. Disadvantages: However, there are some disadvantages of polarized lenses to be aware of. Although polarized lenses will protect our eyes, they are typically more expensive than normal lenses. When we wear polarized sunglasses, it can be difficult to look at LCD screens. If this is a part of our job, the sunglasses are going to need to be removed. Second, polarized sunglasses are not meant for nighttime wear. They can make it difficult to see, especially while driving. This is due to the darkened lens on the sunglasses. We will need a separate pair of eyeglasses for the nighttime. Third, if we are sensitive to the light when it changes, these lenses may not be right for us. Polarized lenses change the light in a different way than typical sunglass lenses.3. What is the difference between HC, HMC and SHC？

Hard coating	AR coating/Hard multi coating	Super hydrophobic coating
makes the uncoated lens hard and increases the abrasion resistance	increases the transmittance of the lens and reduces surface reflections	makes the lens waterproof, antistatic, anti slip and oil resistance

CR39 1.499 Index Polarized Lenses
Model:	1.499 optical lens
Place of Origin:	Jiangsu, China
Brand:	SETO
Lenses Material:	Resin lens
Lenses Color	Grey,Brown and Green
Refractive Index:	1.499
Function:	Polarized lens
Diameter:	75mm
Abbe Value:	58
Specific Gravity:	1.32
Coating Choice:	UC/HC/HMC
Coating color	Green
Power Range:	Sph: 0.00 ~-6.00 CYL: 0~ -2.00

Polarized lenses contain a laminated filter that allows vertical light to pass through but blocks the horizontally oriented light, eliminating the glare. They protect our eyes from the harmful light that could be potentially blinding. There are benefits and disadvantages of polarized lenses,as follows: