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Transcript of Polarized Lenses
How has it affected society?
What are the benefits and limitations?
What are polarized lenses?
Polarized lenses are optical lenses with a thin film of polarized material that restrains or blocks certain types of light wavelengths, so as to minimize glare.
How does polarized lenses work ?
When light waves are reflected off of materials that are partially polarized it creates horizontal waves that is then directed to our eyes.(Polarization)
This is what causes glare to be experience .
By: Victoria Savage
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Examples of polarized lenses
you can find these lenses in:
High quality sunglasses
Eye protection wear in the construction industry
This is to prevent unwanted light rays or wavelengths to pass through the glasses into your eyes, reducing eye strain and providing visual clarity in bright sunlight.
By having polarized material directly in front of your eyes, it will prevent the horizontal wavelengths, 'glare', from entering and produce a more vivid environment for the viewer to see.
(real life applications)
Making roads safer
When driving it is crucial to be able to see not only where you are going but also be able to see the environment and other drivers around you.
A very dangerous situation for a driver is when the sun is at an angle where it produces a glare due to scattering or reflection.
This may cause drivers to be obstructed and can force an unfortunate outcome onto the driver.
Also a situation where drivers are at risk due to glare is when on coming traffic leaves their high beams on.
The use of polarized lenses can prevent these hazardous situation from happening.
For fishermen it is important to have an idea of where the fish are.
When looking at the water on a typical day the reflection of light on the water overwhelms our ability to see through the water.
With the use of polarized sun glasses diminishing the glare on the water people are then able to see clearly past.
This is very useful in the fishing world due to the ability to spot if a location has an abundance of fish or not by simply looking towards the water. This will allow the fisherman to be more productive and efficient by allowing them to have strong judgment and acknowledgment of where the fish are around them.
Polarized vs. Non Polarized Sunglasses for Fishing
light is made up of waves in all directions and when it is not obstructed it is called non-polarized light; such as the light that comes from the sun.
Polarized material does not always enhance your sight when thought of in another perspective.
Having polarized sunglasses in front of your eyes can greatly benefit you at times, however at other times where seeing a sudden glare that grabs your attention at a crucial moment may save your life, polarized glasses are not so glamorous as they seem.
(real life applications)
In many situations such as for snowmobiles, snowboarders, or drivers being aware of ice patches in front of you is very crucial.
With the use of polarization, the glare of materials such as ice is reduced or simply blocked from the viewers sight.
This will cause the viewer who is performing these delicate activities to be oblivious of the dangers that lie ahead.
Therefore in cases like this individuals should think twice about using polarized lenses in such an unpredictable climate.
another example similar to this includes:
spotting oil spills on roads
Without the glare you receive when the light reflects off the oil, it is extremely difficult to see its location.
This can cause drivers to loose control and get into an accident.
Polarization is a process which filters light waves.
(real life applications)
The use of polarization can block an individual's view when looking at many electronic devices such as LCD, cell phone, and GPS screens.
Typically this is not a dramatic side affect, however in some jobs such as piloting it is important to see the warning symbols on the screens. therefore for situations like this polarized lenses should be prohibited
The use of polarized lenses will not be used indoors where there are screens or when using your cell phone. This limits the extent where they can be used.
Glare by Scattering
theoretically Light travels in waves
we know this by the many contributions from scientist that have supported this theory
as the light , which contains many distinctive angles of wavelengths, travels threw the polarized filter only those distinct wavelengths that match the orientation of the filter are permitted to pass.
in the figure below the orientation of the filter is vertical. This means that only the wavelengths that travel in a vertical direction can pass through and be named polarized light in the outcome.
Between the years of 1665-1678 the wave theory of light was introduced by Robin Hook and then conceptualized by Christiaan Huygens in his wave principles.
This was in contrast to Isaac Newton's more popular theory that light travelled as little particles called "corpuscles".
At the end of the 1700's, Thomas Young used a double slit experiment that showed an interference pattern which proved the wave theory of light to a large extent.
history of the wave theory
Although many test to show light follows wave theory have been completed, there were still questions about how light travels through a medium-less environment such as space. It was believed that there is a medium that is beyond our knowledge called the 'Ether' witch allows this phenomenon.
in 1864 James Maxwell formulated the laws of electromagnetism that laid the foundation for how electromagnetic waves like light could travel through space.
(A Brief History of Optics and Wave Theory)
Why is this important?
It is the wave theory that is the premise of the hole functionality related to polarized lenses
The lenses ability to filter glare can only be explained and understood by using this theory.
Glare by Reflection
Step by step
The particles floating in the air or dirt particles smudged against a car's windshield causes the scattering of light.
Light waves when in impact with these particles are then redirected onto a new trajectory into the driver's eyes which causes glare.
This can be very dangerous for the driver due to these unpredictable angles of glare.
Most of these redirected rays are traveling horizontally and would benefit with the use of polarized lenses.
(real life application)
Unlike normal sunglasses that just tint the shade of the lenses darker to reducing the total amount of light that is coming in, polarized lenses in sunglasses allow all the vibrant colors to shin through as it eliminates the light that strains your eyes.
Eliminating such distracting rays but keeping the colors constant allows the viewer to see much more vividly and allows players in sports to have sharper vision.
(real life application)
Using polarized sunglasses in sports
(Are Polarized Sunglasses Good for Baseball?)
Looking cool with Polarization
Over many years the symbol of wearing sunglasses have always been looked as a symbol of coolness in our culture.
With more and more people using polarized glasses as a tool for recreation and safety there is no doubt that these lenses has impacted society.
From famous sport player wearing them purely for use in enhancing their game, it quickly shifts to being a new fad or a social requirement.
Another societal upraising is a new line of sunglasses by Lady Gaga, a famous singer. Her new line in Polaroid sunglasses created much hype by her fans. These lenses also uses polarization in its digital cameras.(Lady Gaga Unveils Her Polaroid Line)
How has this affected people's health?
Many believe that Polaroid sunglasses provide long term health benefits due to the reduction of reflected light and glare. In actual fact the main health benefit of polarized lenses are reduce eye strain which can create stress on the eye, fatigue, irritation, and headaches.
Longer term health benefits with respect to cataracts, degenerative eye disease, and cancers are delivered predominantly by UV filters more than polarize filters, however both in fact do contribute.
Reduces the glare, seeing vividly
Recreational and sports use
Health benefits of reduced eye strain
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(A Brief History of Light)