Polycarbonate and Trivex Lenses

Polycarbonate and Trivex lenses are highly resistant to impact and won’t shatter.  Therefore lenses have good impact resistance, making them ideal for children, sports and industrial work. They also have good UV protection and a higher refractive index than CR39. Both these lenses give the benefits of a sunglass inherently blocking 100% UV rays without needing a special coating.

 

But some differences can make Trivex a preferable option.

Trivex has a higher clarity in its central and peripheral vision. Trivex has a higher ‘Abbe’ value than polycarbonate. The Abbe value is a measure of the material’s properties with regard to the dispersion of the colours within the light that passes through the lens. It’s called chromatic aberration. The higher the value, the better the overall lens clarity.

 

 

Photochromic lenses

What are photochromic lenses?

Photochromic lenses are one of your options when selecting eyeglasses. They’re the type of lens that transitions to a darker color when exposed to the sun or other sources of UV light. 

Other names for photochromic lenses include: 

• Transition lenses
• Light adaptive lenses
• Variable tint lenses  

 

Photochromic lenses are ideal for people who need to be wearing spectacles all the time. The two main purposes of photochromic lenses are to protect your eyes from UV light and to eliminate the need for a separate pair of prescription sunglasses. 

 

You’re repeatedly exposed to UV light throughout your lifetime, mainly in the form of sunlight. Over the course of your life, UV light can damage your eyes and the skin that surrounds them. This means that it’s important to protect your eyes by using products like photochromic lenses. 

The types of eye damage that repeated UV exposure can lead to include: 

 

• Cataract - This is when the lenses in your eyes become cloudy and increasingly more opaque with this condition. Cataracts eventually lead to blindness. You need surgery to treat this condition. 
• Macular degeneration - This is the major cause of blindness in people who are older than 55. It’s the result of accumulated eye damage throughout your lifetime. There currently isn’t a cure. 
• Corneal damage - Your cornea is crucial for proper vision. UV lightwaves can particularly damage this part of your eye. 

 

Polarised Lenses

 

Polarised sunglasses are designed to reduce glare from light-reflecting surfaces like water, glass or snow, as well as protect your eyes from harmful UV rays.

Normal sunglasses will protect your eyes from bright light, and in most cases, offer UV protection — but they aren’t always able to reduce glare. Polarised sunglasses can look exactly the same as standard sunglasses, but their lens have a polarising film which changes the way light reaches your eyes.

 

The film works by acting as a shutter to block out light reflected from horizontal surfaces. The polarising filter only allows light that is vertically polarised to pass through the lenses and blocks any horizontally polarised light. That’s how polarised lenses reduce glare.

 

Polarised sunglasses can help to enhance sports performance by helping athletes to see clearly and react quickly when they need to. They’re often used for snowboarding, skiing, watersports, cycling, shooting, archery, fishing, golf,

and even hiking. The style of polarised sports sunglasses is slightly different from polarised fashion sunglasses and typically have a wrap-around frame to protect the eyes from foreign objects and injury during sport.

 

 

High-index lenses

 

These are lenses that bend light in a more effective way due to their higher index of refraction. An individual’s prescription will determine how the lenses will look. A short-sighted person’s lens thickness will be on the edge of the lens, therefore choosing a higher-index lenses will result in a thinner and slightly lighter lens. The higher the index, the thinner the lens.  They’re thinner, lighter, and less obtrusive within frames. Lower-index lenses can also magnify or shrink the appearance of your eyes, which is not as much with the high-index lenses.

 

Anti-reflection

Reduces image ghosting, makes your eyes more visible and lets more light through - making your vision clearer and comfortable for the eye.

 

What is UV400 protection in sunglasses?

Sunglasses with UV400 protection can filter out up to 99% of UVA and UVB rays. This is slightly higher than what British Standards require for eye protection, which makes them the best choice to ensure that your eyes are fully protected from sun damage.