These lenses are especially important for outdoor people that require precise vision with minimal glare. Polarized lenses are unique lenses that work similarly to a Venetian blind.A blind only lets in light at certain angles, which is how a polarized lens works.With the removal of the sun's glare, objects become more distinct and are seen in their true colors.Reduced glare off water, roads, and other objects make the polarized lens a favorite for water sports, fishing, cycling and driving.

  • The density of color remains the same.
  • Density of color can be dark(C) or light(A).
  • Materials include plastic, glass and polycarbonate.
  • Styles include single vision, bifocal and progressive lenses.
  • Colors include Gray, Brown, and many others.
  • Decreases driving fatigue. Because much of the light reflected from large areas of pavement is polarized, those who do a lot of driving will benefit from polarizing lenses.
  • Comfort at the beach is increased.Sand and water are both sources of polarized glare, making these lenses especially appropriate.Colors are not bleached out.Reflected polarized light produces a veiling glare that may cause colors to appear less vivid. When glare disappears, color return.
  • Bright snowy days are not as blinding.Snow is highly reflective. It is also polarizing.Those who are out working or driving in the snow will benefit from using polarizing lenses. (NOTE: Polarizing lenses may not be as advantageous for skiers as one might think. Skiers' heads tilt left and right, making the polarizing filter less effective when the frame is no longer oriented parallel to the ground.)
  • They also may also react adversely with liquid crystal displays (LCDs) found on the dashboards of some cars or in other places such as the digital screens on automatic teller (bank) machines.The problem with LCDs is that when viewed through polarized lenses from a certain angle, they can be invisible.
  • Overall, polarized lenses provide many wonderful benefits

Frequently Asked Questions about Polarized Glasses

What is the difference between a polarized lens and an ordinary tinted lens?

While ordinary tinted lenses reduce brightness, only polarized lenses eliminate glare. Polarization is achieved by placing a thin sheet of polarized film between two layers of material.


How does a polarized lens work?

Light rays vibrate in many directions. As light passes through a polarized lens, the polarized film channels the light rays to travel in the same direction; thus eliminating unsightly glare, much the same way as a venetian blind channels light.


Is it possible to get a clear polarized lens?

No, it is not. The amount of polarization a lens achieves is proportional to the density of the film. The lighter the film, the less polarization a lens can offer. Tinting a light polarized lens does not increase its polarity. It simply darkens the lens and reduces brightness. To achieve maximum polarization, you must use a lens that utilizes a dark (grey-c or brown-c) film.


How thin can these polarized lenses be surfaced?

The following are our recommended center thickness':

  1. normal cr-39tm polarized lenses - 1.8mm
  2. hi index polarized lenses - 1.7mm
  3. polarized polycarbonate lenses - 1.5mm
  4. glass polarized lenses - 3.0mm to 3.5mm. Glass lenses require additional center thickness to accommodate the front wafer and segment thickness.


What determines a superior quality polarized lens?

The three most important factors in grading a polarized lens are:

  1. clarity of the polarized film: inferior polarized lenses have a hazy film.
  2. density of the polarized film: lenses that possess a light film will not perform as well as lenses that utilize a dark film.
  3. film placement: in order to achieve a cosmetically appealing thin pair of eyeglasses, the laboratory must be able to know, with certainty, exactly where the polarized film is placed in relationship to the front of the lens.

Can polarized lenses be tinted and is tinting recommended?

Yes, plastic polarized lenses may be tinted. We recommend a tinting temperature of 200 degrees or less. We recommend tinting for those people trying to achieve a particular color but it should be remembered that you do not increase polarization by tinting.


Do polarized lenses provide U.V. protection?

All of our polarized lenses afford 99% absorption at 380 nanometers.


Can polarized lenses be AR coated (antireflection coating)?
 

Yes, however, it is unnecessary to AR coat both sides. We normally recommend coating only the back side curve.

Are polarized lenses available with a photochromic material.

Yes, KBco has a lens called Transhades that is both a polarized and photochromic lens.


Article provided by
Agape Optometry Center
Used with Permission



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