What Is The Meaning Of Polarized Sunglasses?
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November 2013 Wearing sunglasses under direct sunlight: Large lenses offer good protection, but broad temple arms are also needed against "stray light" from the sides.
Sunglasses or sun glasses are a form of designed primarily to prevent bright and from damaging or discomforting the eyes.
They can sometimes also function as a visual aid, as variously termed spectacles or exist, featuring lenses that are colored, or darkened.
In the early 20th century, they were also known as sun cheaters cheaters being an slang term for glasses.
The recommends sunglasses whenever a person is in the sun to protect the eyes from UV and blue light, which can cause several.
Its usage is mandatory immediately after some surgical procedures, such asand recommended for a certain time period in dusty areas, when leaving the house and in front of a TV screen or computer monitor after.
Sunglasses have long been associated with and primarily from a desire to mask their identity.
It is said that the Roman emperor liked to watch fights with.
These, however, appear to have worked rather like mirrors.
Sunglasses made from flat panes ofwhich offered no corrective powers but did protect the eyes from glare, were used in in the 12th century or possibly earlier.
Ancient documents describe the use of such crystal sunglasses by judges in ancient Chinese to conceal their facial expressions while questioning witnesses.
These were not "sunglasses" as that term is now used; Ayscough believed that blue- or green-tinted glass could correct for specific vision impairments.
Protection from the Sun's rays was not a concern for him.
One of the earliest surviving depictions of a person wearing sunglasses is of the scientist in 1772.
Modern developments Effect of pair of polarized filters In thethe use of sunglasses started to become more widespread, especially among movie stars.
It is commonly believed that this was to avoid recognition by fans, but an alternative reason sometimes given is that they often had red eyes from the powerful that were needed due to the extremely slow speed film stocks used.
Inexpensive mass-produced sunglasses made from were first produced by in 1929.
Foster found a ready market on the ofwhere he began selling sunglasses under the name from a on the.
By 1938, Life magazine wrote of how sunglasses were a "new fad for wear on city streets.
At present, is the world's largest producer of sunglasses, with exporting 120 million pairs each year.
Functions Visual clarity and comfort This section needs additional citations for.
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November 2013 Sunglasses can improve visual comfort and visual clarity by protecting the eye from.
Various types of disposable sunglasses are dispensed to patients after receiving eye drops during.
The lenses of polarized sunglasses reduce glare reflected at some angles off shiny non-metallic surfaces, such as water.
They allow wearers to see into water when only surface glare would otherwise be seen, and eliminate glare from a road surface when driving into the sun.
Sunglasses with slim temple arms Protection Sunglasses offer protection against excessive exposure to light, including its visible and invisible components.
The most widespread protection is against ultraviolet radiation, which can cause short-term and long-term ocular problems such as, and various forms of.
Medical experts advise the public on the importance of wearing sunglasses to protect the eyes from UV; for adequate protection, experts recommend sunglasses that reflect or filter out 99% or more of and light, with wavelengths up to 400.
Sunglasses that meet this requirement are often labeled as "UV400".
This is slightly more protection than the widely used standard of the European Union seewhich requires that 95% of the radiation up to only 380 nm must be reflected or filtered out.
Sunglasses are not sufficient to protect the eyes against permanent harm from looking directly at the Sun, even during a.
Special eyewear known as are required for direct viewing of the sun.
This type of eyewear can filter out UV radiation harmful to the eyes.
More recently, HEV has been implicated as a cause of age-related macular degeneration; before, debates had already existed as to whether "blue blocking" or amber tinted lenses may have a protective effect.
Some manufacturers already design glasses to block blue light; the insurance companywhich covers most employees, asked eye experts around Charlotte Remé to develop norms for blue blocking, leading to a recommended minimum of 95% of the blue light.
Sunglasses are especially important for children, as their ocular lenses are thought to transmit far more HEV light than adults lenses "yellow" with age.
There has been some speculation that sunglasses actually promote.
This is due to the eyes being tricked into producing less -stimulating in the body.
Assessing protection The only way to assess the protection of sunglasses is to have the lenses measured, either by the manufacturer or by a properly equipped.
Several standards for sunglasses see allow a general classification of the UV protection but not the blue light protectionand manufacturers often indicate simply that the sunglasses meet the requirements of a specific standard rather than publish the exact figures.
The only "visible" quality test for sunglasses is their fit.
The lenses should fit close enough to the face that only very little "" can reach the eye from their sides, or from above or below, but not so close that the eyelashes smear the lenses.
Polariod Sunglass It is not possible to "see" the protection that sunglasses offer.
Dark lenses do not automatically filter out more harmful UV radiation and blue light than light lenses.
Inadequate dark lenses are even more harmful than inadequate light lenses or wearing no sunglasses at all because they provoke the pupil to open wider.
As a result, more unfiltered radiation enters the eye.
Depending on the manufacturing technology, sufficiently protective lenses can block much or little light, resulting in dark or light lenses.
The lens color is not a guarantee either.
Lenses of various colors can offer sufficient or insufficient UV protection.
Regarding blue light, the color gives at least a first indication: Blue blocking lenses are commonly yellow or brown, whereas blue or gray lenses cannot offer the necessary blue light protection.
However, not every yellow or brown lens blocks sufficient blue light.
In rare cases, lenses can filter out too much blue light i.
High prices cannot guarantee sufficient protection as no correlation between high prices and increased UV protection has been demonstrated.
A 1995 study reported that "Expensive brands and polarizing sunglasses do not guarantee optimal UVA protection.
Protecting his eyes from exposure due to exophthalmos, sunglasses have become the trademark of German singer Further functions While non-tinted glasses are very rarely worn without the practical purpose of correcting eyesight or protecting one's eyes, sunglasses have become popular for several further reasons, and are sometimes worn even indoors or at night.
Sunglasses can be worn to hide one's eyes.
Eye contact can be avoided even more effectively by using.
Sunglasses can also be used to hide emotions; this can range from hiding blinking to hiding and its resulting red eyes.
In all cases, hiding one's eyes has implications for ; this is useful inand many professional poker players wear heavily tinted glasses indoors while playing, so that it is more difficult for opponents to read which involve eye movement and thus gain an advantage.
Artist wearing sunglasses as part of her costume for the.
Fashion trends can be another reason for wearing sunglasses, particularly designer sunglasses from high-end fashion brands.
Sunglasses of particular shapes may be in vogue as a.
The relevance of sunglasses within the fashion industry has included prominent fashion editors' reviews of annual trends in sunglasses as well as runway fashion shows featuring sunglasses as a primary or secondary component of a look.
Fashion trends can also draw on the "cool" image of sunglasses and association with a particular lifestyle, especially the close connection between sunglasses and beach life.
In some cases, this connection serves as the core concept behind an entire brand.
People may also wear sunglasses to hide an abnormal appearance of their eyes.
This can be true for people with severe visual impairment, such as thewho may wear sunglasses to avoid making others uncomfortable.
The assumption is that it may be more comfortable for another person not to see the hidden eyes rather than see abnormal eyes or eyes which seem to look in the wrong direction.
People may also wear sunglasses meaning of polarized lens hide dilated or contracted pupils, bloodshot eyes due to drug use, chronic dark circles or crow's feet, recent physical abuse such as abulging eyesaor eyes which jerk uncontrollably.
Lawbreakers have been known to wear sunglasses during or after committing a crime as an aid to hiding their identities.
Standards The international standard for sunglasses is ISO 12312, which was published in 2013.
Part 1 specifies the physical and optical characteristics of glasses, including a range of UV protection levels.
Part 2 specifies the test methods used to validate conformance with Part 1.
The five ratings for transmittance filter under this standard are based on the amount of absorbed light, 0 to 4, with "0" providing some protection from UV radiation and sunglare, and "4" indicating a high level of protection, but not to be worn when driving.
Europe The European standard EN 1836:2005 has four transmittance ratings: "0" for insufficient UV protection, "2" for sufficient UHV protection, "6" for good UHV protection and "7" for "full" UHVV protection, meaning that no more than 5% of the 380 nm rays are transmitted.
Products which fulfill the standard receive a.
There is no European rating for transmittance protection for radiation of up to 400 nm "UV400"as required in other countries incl.
The current European standard, EN 1836:2005, was preceded by the older standards EN 166:1995 Personal eye protection - SpecificationsEN167: 1995 Personal eye protection — Optical test methodsand EN168: 1995 Personal eye protection — Non-optical test methodswhich in 2002 were republished as a revised standard under the name of EN 1836:1997 which included two amendments.
In addition to filtering, the standard also lists requirements for minimum robustness, labeling, materials non-toxic for skin contact and not combustible and lack of protrusions to avoid harm when wearing them.
United States Sunglasses sold in the United States are regulated by the Food and Drug Administration and are required to conform to safety standards.
According to this standard, the lens should have a UVB 280 to 315 nm transmittance of no more than one per cent and a UVA 315 to 380 nm transmittance of no more than 0.
In the basic impact test, a 1 in 2.
To pass both tests, no part of the lens may touch the eye.
Special-use Land vehicle driving When driving a vehicle, particularly at high speed, dazzling glare caused by a low sun, or by lights reflecting off snow, puddles, other vehicles, or even the front of the vehicle, can be lethal.
Sunglasses can protect against glare when driving.
Two criteria must be met: vision must be clear, and the glasses must let sufficient light get to the eyes for the driving conditions.
General-purpose sunglasses may be too dark, meaning of polarized lens otherwise unsuitable for driving.
Variable tint or photochromic lenses increase their optical density when exposed to UV light, reverting to their clear state when the UV brightness decreases.
Car windscreens filter out UV light, slowing and limiting the reaction of the lenses and making them unsuitable for driving as they could become too dark or too light for the conditions.
Some manufacturers produce special photochromic lenses that adapt to the varying light conditions when driving.
Lenses of fixed tint are graded according to the optical density of the tint; in the UK sunglasses must be labelled and show the filter category number.
Lenses with light transmission less than 75% are unsuitable for night driving, and lenses with light transmission less than 8% category 4 are unsuitable for driving at any time; they should by UK law be labelled 'Not suitable for driving and road use'.
Yellow tinted lenses are also not recommended for night use.
Due to the light levels within the car, filter category 2 lenses which transmit between 18% and 43% of light are recommended for daytime driving.
Polarised lenses normally have a fixed tint, and can reduce reflected glare more than non-polarised lenses of the same density, particularly on wet roads.
Graduated lenses, with the bottom part lighter than the top, can make it easier to see the controls within the car.
All sunglasses should be marked as meeting the standard for the region where sold.
An is recommended, and a hard coating to protect the lenses from scratches.
Sunglasses with deep side arms can block side, or peripheral, vision and are not recommended for driving.
Even though some of these glasses are proven good enough for driving at night, it is strongly recommended not to do so, due to the changes in a wide variety of light intensities, especially while using yellow tinted protection glasses.
The main purpose of these glasses are to protect the wearer from dust and smog particles entering into the eyes while driving at high speeds.
Aircraft piloting Many of the criteria for sunglasses worn when piloting an aircraft are similar to those for land vehicles.
Protection against UV radiation is more important, as its intensity increases with altitude.
Polarised glasses are undesirable as aircraft windscreens are often polarised, intentionally or unintentionally, showing on looking through the windscreen; and some used by instruments emit polarised light, and can dim or disappear when the pilot turns to look at them.
Sports This section does not any.
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November 2013 Sunglasses worn by an ocean kayaker Likesunglasses have to meet special requirements when worn for sports.
They need shatterproof and impact-resistant lenses; a strap or other fixing is typically used to keep glasses in place during sporting activities, and they have a nose cushion.
For water sports, so-called water sunglasses also: surf or water eyewear are specially adapted for use in turbulent water, such as the or.
In addition to the features for sports glasses, water sunglasses can have increased to stop them from sinking should they come off, and they can have a vent or other method to eliminate fogging.
These sunglasses are used in water sports such as,,and.
Mountain climbing or traveling across glaciers or snowfields requires above-average eye protection, because sunlight including ultraviolet radiation is more intense in higher altitudes, and snow and ice reflect additional light.
Popular glasses for this use are a type called glacier glasses or glacier.
They typically have very dark round lenses and leather blinders at the sides, which protect the eyes by blocking the Sun's rays around the edges of the lenses.
Special shaded visors were once allowed in ;quarterback for the andfamously used a sun visor during his professional football career due to a childhood eye injury and almost always wears dark sunglasses when not wearing a.
Darkened visors now require a doctor's prescription at most levels of the game, mainly because concussion protocol requires officials to look a player in the eye, something made difficult by tinted visors.
Space 2006: Swedish astronaut wears glasses during a construction mission for the Special protection is required for space travel because the sunlight is far more intense and harmful than on Earth, where it is always filtered through the.
Sun protection is needed against much higher UV radiation and even against harmful radiation, both within and outside the spacecraft.
Within the spacecraft, astronauts wear sunglasses with darker lenses and a thin protective coating.
Duringthe visor of the astronauts' helmets, which also has a thin gold coating for extra protection, functions as strong sunglasses.
The frames of sunglasses and corrective glasses used in space must meet special requirements.
They must be flexible and durable, and must fit firmly in zero-gravity.
Reliable fit is particularly important when wearing corrective glasses underneath tight helmets and in space suits: once inside the spacesuit, slipped glasses cannot be touched to push them back into place, sometimes for up to ten hours.
Frames and glasses must be designed so that small pieces of the glasses such as screws and glass particles cannot become dislodged, then float and be inhaled.
The first sunglasses used in a Moon landing were the original produced by.
In 1969 they were used aboard the Eagle, the lunar landing module ofthe first manned mission to land on the Moon.
NASA research primarily by scientists James B.
Stephens and Charles G.
Miller at the resulted in special lenses that protected against the light in space and during laser and welding work.
The lenses used colored dyes and small particles ofwhich absorbs ultraviolet light and is also used in lotions.
The research was later broadened to further terrestrial applications, e.
Since 2002 NASA uses the frame of the designer model Titan Minimal Art of the Austrian companycombined with specially dark lenses developed jointly by the company and "the" NASA Keith Manuel.
The frame is very light at 1.
These lenses are popular with skiers, hunters, boaters and pilots".
With the introduction ofmay recommend mildly tinted glasses for use by display operators, in order to increase contrast.
The latter allow the passage of enough light so normal evening activities can continue, while blocking the light that prevents production of the.
This can be especially useful to see beneath the surface of the water when fishing.
Athlete wearing lenses in.
A coating can be applied to the lens.
This mirrored coating deflects some of the light when it hits the lens so that it is not transmitted through the lens, making it useful in bright conditions; however, it does not necessarily reflect UV radiation as well.
Mirrored coatings can be made any color by the manufacturer for styling and fashion purposes.
The color of the mirrored surface is irrelevant to the color of the lens.
For example, a gray lens can have a blue mirror coating, and a brown lens can have a silver coating.
Sunglasses of this type are sometimes called.
A mirror coating does not get hot in sunlight and it prevents scattering of rays in the lens bulk.
Sunglass lenses are made of either, or SR-91.
Plastic lenses are typically made from, or.
Glass lenses have the best optical clarity and scratch resistance, but are heavier than plastic lenses.
They can also shatter or break on impact.
Plastic lenses are lighter and shatter-resistant, but are more prone to scratching.
Polycarbonate plastic lenses are the lightest, and are also almost shatterproof, making them good for impact protection.
CR-39 is the most common plastic lens, due to low weight, high scratch resistance, and low transparency for ultraviolet and infrared radiation.
SR-91 is a proprietary material that was introduced by in 2001.
Kaenon's lens formulation was the first non-polycarbonate material to pass the high-mass impact ANSI Z.
Additionally, it was the first to combine this passing score with the highest marks for lens clarity.
Jerry Garcia's sunglasses had a which was 'cutting edge' in 1995.
Any of the above features, color, polarization, gradation, meaning of polarized lens, and materials, can be combined into the lens for a pair of sunglasses.
Gradient glasses are darker at the top of the lens where the sky is viewed and transparent at the bottom.
An alternative is to use the corrective glasses with a secondary lenses such as oversize sunglasses that fit over the regular glasses, clip-on lens that are placed in front of the glasses, and flip-up glasses which feature a dark lens that can be flipped up when not in use see below.
Frames This section does not any.
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November 2013 This sunglass eyeshield uses a nylon half-frame and interchangeable lenses Frames are generally made of plastic,a or a.
Nylon frames meaning of polarized lens usually used in sports because they are lightweight and flexible.
They are able to bend slightly and return to their original shape instead of meaning of polarized lens when pressure is meaning of polarized lens to them.
This flex can also help the glasses grip better on the wearer's face.
Metal frames are usually more rigid than nylon frames, thus they can be more easily damaged when the wearer participates in sport activities, but this is not to say that they cannot be used for such activities.
Because metal frames are more rigid, some models have loaded hinges to help them grip the wearer's face better.
The end of the resting hook and the bridge over the nose can be textured or have or plastic material to improve hold.
The ends of the resting hook are usually curved so that they wrap around the ear; however, some models have straight resting hooks.
In recent years, manufacturers have started to use various types of woods to make frames for sunglasses.
Materials such as,pear wood, walnut andare used making them non-toxic and nearly allergy free.
The construction of a wooden frame involves laser-cutting from planks of wood.
Already cut and ground to a uniform size, a buffing wheel is used to sand and buff every piece separately before they are assembled.
The laser-cutouts of wood are then glued together by hand mostlylayer on layer, to produce wooden frames.
Some brands have experimented with recycled wood from objects likewhiskey barrels and.
Their final look can vary according to the color, type and finishing.
With wooden sunglasses, various shades of brown, beige, burgundy or black are most common.
Wooden sunglasses come in various designs and shapes.
However, these sunglasses are usually more expensive than the conventional plastic, acetate or metal frames and require more care.
They have been famously worn by the likes ofand.
Frames can be made to hold the lenses in several different ways.
There are three common styles: full frame, half frame, and frameless.
Full frame glasses have the frame go all around the lenses.
Half frames go around only half the lens; typically the frames attach to the top of the lenses and on the side near the top.
Frameless glasses have no frame around the lenses and the ear stems are attached directly to the lenses.
There are two styles of frameless glasses: those that have a piece of frame material connecting the two lenses, and those that are a single lens with ear stems on each side.
Some sports-optimized sunglasses have interchangeable lens options.
Lenses can be easily removed and swapped for a different lens, usually of a different color.
The purpose is to allow the wearer to easily change lenses when light conditions or activities change.
The reasons are that the cost of a set of lenses is less than the cost of a separate pair of glasses, and carrying extra lenses is less bulky than carrying multiple pairs of glasses.
It also allows easy replacement of a set of lenses if they are damaged.
The most common type of sunglasses with interchangeable lenses has a single lens or shield that covers both eyes.
Styles that use two lenses also exist, but are less common.
Nose bridge Nose bridges provide support between the lens and the face.
They also prevent pressure marks caused by the weight of the lens or frame on the cheeks.
People with large noses may need a low nose bridge on their sunglasses.
People with medium noses may need a low or medium nose bridge.
People with small noses may need sunglasses with high nose bridges to allow clearance.
Fashion alphabetically This section needs additional citations for.
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August 2014 The following types are not all mutually exclusive; glasses may be in Aviator style with mirrored lenses, for example.
Aviator Aviator sunglasses Aviator sunglasses feature oversize teardrop-shaped lenses and a thin metal frame.
As a fashion statement, aviator sunglasses are often made in mirrored, colored, and wrap-around styles.
The model first gained popularity in the 1940s when was seen sporting a pair at the Pacific Theatre.
However, it was in the late 1960s when the frames became widely used with the rise of the hippie counterculture, which preferred large metallic sunglasses.
The brand became an icon of the 1970s, worn by and among others, and was also used as prescription eyeglasses.
Aviators' association with disco culture led to a decline in their popularity by 1980.
The model saw more limited use throughout the 1980s and 1990s, aided by a 1982 product placement deal, featured most notably in Top Gun and Cobra, with both films causing a 40% rise in 1986.
Aviators became popular again around 2000, as the hippie movement experienced a brief revival, and was prominently featured in the MTV show Jackass.
Browline Main article: Based on the eyeglass design of the same name, browline glasses have hard plastic or arms and upper portions joined to a wire lower frame.
A traditional, conservative style based on mid-20th century design, browlines were adapted into sunglasses form in the 1980s and rapidly became one of the most popular styles; it has ebbed and sprung in popularity in the decades that have followed.
Oversized Oversized sunglasses à la Jackie O Oversized sunglasses, which were fashionable in the 1980s, are now often used for humorous purposes.
They usually come in bright colors with colored lenses and can be purchased cheaply.
The singer Elton John sometimes wore oversized sunglasses on stage in the mid-1970s as part of his act.
Since the late 2000s, moderately oversized sunglasses have become a fashion trend.
There are many variations, such as the "Onassis", discussed below, and Dior white sunglasses.
Onassis glasses or "Jackie O's" are very large sunglasses worn by women.
This style of sunglasses is said to mimic the kind most famously worn by in the 1960s.
The glasses continue to be popular with women, and celebrities may use them, ostensibly to hide from paparazzi.
Oversized sunglasses, because of their larger frames and lenses, are useful for individuals who are trying to minimize the apparent size or of their nose.
Oversized sunglasses also offer more protection from sunburn due to the larger areas of skin they cover, although sunblock should still be used.
Shutter shades Main article: Shutter shades were invented in the late 1940s, became a in meaning of polarized lens early 1980s and have experienced a revival in the early-to-mid 2010s.
Instead of tinted lenses, they decrease sun exposure by means of a set of parallel, horizontal shutters like a small.
Analogous to Inuit goggles seethe principle is not to filter light, but to decrease the amount of sun rays falling into the wearer's eyes.
To provide UV protection, shutter shades sometimes use lenses in addition to the shutters; if not, they provide very insufficient protection against ultraviolet radiation and blue light.
Teashades This section does not any.
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November 2013 Teashade sunglasses "Teashades" sometimes also called " glasses", "Round Metal", or, occasionally, "Granny Glasses" were a type of wire-rim sunglasses that were often worn, usually for purely aesthetic reasons, by members of the 1960s counterculture.
Pop icons such as,, Duckie in and 's character in the film all wore teashades.
The original teashade design was made up of medium-sized, perfectly round lenses, supported by pads on the bridge of the nose and a thin wire frame.
When teashades became popular in the late 1960s, they were often elaborated: Lenses were elaborately colored, mirrored, and produced in excessively large sizes, and with the wire earpieces exaggerated.
A uniquely colored or darkened glass was usually preferred.
Modern versions tend to have plastic lenses, as do many other sunglasses.
Teashades are hard to find in shops today; however, they can still be found at many costume Web sites and in some countries.
The term has now fallen into disuse, although references can still be found in literature of the time.
Wayfarer Original Ray-Ban Wayfarer The is a mostly plastic-framed design for sunglasses produced by the company.
Introduced in 1952, the trapezoidal lenses are wider at the top than the bottom inspired by the Browline eyeglasses popular at the timeand were famously worn by, and other actors and singers.
The original frames were black; frames in many different colors were later introduced.
There is often a silver piece on the corners as well.
Since the early 1980s, makers have also developed variants of the model, most notably the Clubmaster model, introduced in 1982, essentially Browlines made of plastic.
In the late 1970s, the rise ofand the popularity of aside from 50s and 60s nostalgia and the anti-disco backlash later on brought the model out of near-retirement, becoming the most sold model between 1980 and 1999 aided by a lucrative 1982 product placement deal, which put it on many movies and TV shows such as and.
Wrap-around Mirrored wrap-around sunglasses Wrap-arounds are a style of sunglasses characterized by being strongly curved, to wrap around the face.
They may have a single curved semi-circular lens that covers both eyes and much of the same area of the face covered by protective goggles, usually with a minimal plastic frame and single piece of plastic serving as a nosepiece.
Glasses described as wraparound may alternatively have two lenses, but again with a strongly curved frame.
These were first made in the 1960s as variants of the Aviator model, used by and in the Dirty Harry films.
The modern variant surged in the mid-1980s, heavily based on the then-popular Wayfarer, but adapting it to a more futuristic look.
As a backlash against 80s fashion occurred in the 1990s, wraparounds became one of the favorite frames of the decade.
Variants Clip-on Clip-on glasses are a form of tinted glasses that can be clipped on to eyeglasses for protection from the Sun.
Gradient lenses Glasses with gradient lenses Gradient lenses go from a darker shade at the top to a lighter one at the bottom, so there will be more protection from sunlight the higher one looks through the lens, but the lower one looks through the lens, the less protection is offered.
An advantage is that one can wear them indoors without fear of tripping over something and also allowing the user to see.
Wearing sunglasses to nightclubs has become common in recent times, where the gradient lens comes in handy.
Gradient lenses may also be advantageous for activities such as flying airplanes and driving automobiles, as they allow the operator a clear view of the instrument panel, low in his line of sight and usually hidden in shadow, while still reducing glare from the view out the windscreen.
Londonhas also referred to these style of sunglasses as the Murphy Lens.
Double gradient lenses are dark at the top, light in the middle and dark at the bottom.
Gradients should not be confused with and.
Flip-up Flip-up sunglasses add the benefits of sunglasses to corrective eyeglasses, allowing the wearer to flip up the tinted lenses for indoor use.
Mirrored Mirrored aviators Mirrored lenses have a metallic, partially reflective coating on the outer surface combined with a tinted glass lens.
Mirrored lenses of different colors can expand the range of fashion styles.
Other names This section does not any.
Unsourced material may be challenged and.
Also in use is the derivative abbreviation, shades.
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In each of the instances, the female suspect wore a distinctive wig and sunglasses to conceal her identity.
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What does polarized mean?
Polarized lenses offer specific protection from UV rays and are well suited for some activities. But, that doesn't always mean increased UV. For us, it means that ground reflections cause a lot of interference with our vision on water or pavement. Normal sunglasses provide basic protection against both ...
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