How do Polaroid polarized lenses work? What do the filter categories mean?

Daylight travels in waves oscillating in all directions of the three-dimensional space. When daylight strikes a non-metallic surface such as water, it get polarized and mostly moves in two dimensions: horizontally and vertically. Vertical light brings useful information to the human eye, enabling us to see colors and contrasts, while horizontal light simply creates optical noise or glare.

This distracting glare can be selectively blocked only by a good quality polarizing filter. Polarizing lenses selectively filter out the horizontal light, thus eliminating glare.

What are the key benefits of Polaroid polarized sunglasses?

Wearing Polaroid sunglasses means:

  • Glare-free vision
  • Clear contrasts
  • Natural colors
  • Reduced eye fatigue
  • 100% UV400 protection
Why is perfect UV protection so important?

98.7% of the ultraviolet radiation that reaches the earth's surface is UVA, and occurs up to 400nm. But most sunglasses only provide protection up to the 380nm level. UltraSight is different. These lenses protect wearers up to

the highest UV exposure level. That's 100% protection from UVA, UVB and UVC rays. UltraSight exceeds all international requirements from UV protection and offers both medical and cosmetic benefits.

Risk of UV exposure
  • Macula degeneration
  • Cataracts on the cornea
  • Pterygium growth on the conjunctiva
  • Photokeratitis of the retina
  • Skin cancer of the eyelid
  • Collagen fibre damage
  • Sunburn of skin around the eye
  • Crow's feet wrinkle lines
Why are Polarized sunglasses important for children's eyes?

Children's eyes are extremely sensitive. It is very important to have them protected against harmful UV rays. This is why all our polarized lenses are giving them 100% UV 400 protection. Thanks to the polarization filter,

polarized lenses block out disturbing glare. This makes it very comfortable to see, so children feel great about keeping the sunglasses on. That means they stay fully protected when the sun is out.

What do the filter categories on sunglasses mean?

There are five filter categories:

  1. clear or very light tint
  2. light tint
  3. medium
  4. dark
  5. very dark

The number is a reference to the tint of the lenses. It does not affect the UV filter or polarization. Categories 1 and 2 are better for low light conditions, i.e. morning and evening. Most sunglasses are category 3 and work welll in full sunlight. Category 4 is not recommended for driving.

Which sunglasses are recommended for driving?

When you're driving, polarized sunglasses eliminate the glare that reflects off flat surfaces and interfers with vision. Polarized lenses in bronze, copper and brown are ideal. These colors absorb blue light that the human eye

finds difficult and uncomfortable to use. They also make it easier to see traffic and brake lights. For all around use, filter category 3 works well.

What are Suncovers™?

Suncovers are sunglasses that fit perfectly over your optical frame. Polaroid Suncovers protect you fully from UV and annoying glare. Suncovers are a less expensive alternative to prescription sunglasses. They are often used

in the car. After all you do not want to change your optical frames for prescription sunglasses while driving as this could be dangerous. With Suncovers you can keep your optical frames on and still get full protection from the sun.