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How Polarized Sunglasses Lenses Work - The Benefits of Polarized Sunglasses and Polarized Sunglasses Lenses

 

Prescription Sunglasses

When sunlight reflects off a horizontal surface, like a road or water, it often becomes concentrated horizontally (or travels directly at the eye, rather than perpendicular to it.. This is called glare. Vertical light is useful to the human eye. Glare makes it difficult and uncomfortable to see clearly.

Polarization

Polarized sunglass lenses reduce glare by minimizing the passage of undesirable light. Polarization blocks light that is bounced from odd angles. These odd angles can form a sort of "light spray" which reduce clarity. Polarization works by filtering this light spray, passing only controlled, orderly light rays that reach your eyes. This results in sharper vision, vivid colors and improved depth perception


Prescription Sunglasses

Non-Polarized Lense on left

Non-polarized sunglasses don't block glare.

Polarized Lense on right

Polarized sunglasses block glare and allow only useful vertical light to reach your eyes.

What causes glare

Light is made up of waves traveling in different directions. Vertical light is useful to the human eye; it helps us see. Horizontal light, however, simply creates glare. Glare is concentrated light reflecting off a horizontal shiny surface, such as a car windscreen, sand, water, snow or asphalt roads. It reduces visibility and can make it uncomfortable, painful and even dangerous to carry on driving, cycling, skiing or just sunbathing.


Prescription Sunglasses Prescription Sunglasses

Non-Polarized Lense on top

Polarized sunglasses block glare and are even helpful driving during rainy conditions.

Polarized Lense on bottom

Polaroid polarized sunglasses block glare and allow you to look into the water.

 

Polarized Lenses compared to tinted lenses

Regular non-polarized sun lenses indiscriminately filter all light whether it is horizontal or vertical. Glare is dampened, but not eliminated. More importantly, by filtering all components of light, visual acuity is diminished. On the other hand polarized lenses allow in the vertical component of light, which is preferred for clear vision, while eliminating the easily scattered and skewed horizontal component of light. Vertically aligned light is preferred because it respects the natural tendency of the visual system to focus on the vertical component of an image. There are actually times when a tinted lense is preferred over a polarized lense. This includes viewing certain types of LCD screens, where the polarization could black out the screen.

Polarized Sunglasses for driving

Polarized sunglasses help when driving a car by reducing those bright reflections of the sun on the cars ahead. They tend to be horizontally polarized, thus perfect for vertically polarized sunglasses. The reason is that the surfaces that you see on the car in front of you (the back window, the rear door, and even the roof) is slanted towards you, while the sun will be more or less aligned in the vertical plane through both cars. Polarizing lenses will provide higher definition vision for driving, remove dazzling effects and reduce eye fatigue.


Polarized Sunglasses for water sports

The glare of the sun on the sea and other water surfaces is highly polarized. Indeed, glare can be almost completely horizontally polarized, depending on the height of the sun.  In addition, all reflections from objects above water are partially polarized. These include clouds and even the sky (the reflected sky gives most of its blue color to the sea).These are examples of polarization by reflection. Although the light from the sun is not polarized, it can be separated into two polarized components that are reflected and transmitted in different amounts by the surface of the water. More of the horizontal component will be reflected than the vertical component, thus partially polarizing the reflected light. With polarized sunglasses they will stop the glare and make the sea appear more transparent enabling you to see fish and rocks below the surface.


 

 

 

 

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