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Zeal Optics Tensai Polarised Glasses Optics Eyewear

Zeal Optics Tensai Polarised Glasses: £69.95
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Description

Tensai means "Genius" in Japanese, and provides a fit that is simply genius.

 

Like pillows for your eyes, Zeal's exclusive ZB-13 POLARISED lenses are one of the most relaxing experiences you will ever have. The proprietary ZB-13 lens colour soothes your eyes, enhances vision and allows for your eyes to adjust to the always-changing lighting conditions.

 

It provides optimum blend of contrast, clarity and light transmission for all day COMFORT for your eyes. The layered polarised lens filter, cuts our horizontal glare experienced with sports such as driving, water and snow activities.

 

Over the years, Zeal have tested lens colours and treatments to find the ultimate in PERFORMANCE blend of lens colour. ZB-13 POLARIZED is an enticing mix of all that is soothing and enhancing in colour.

 

Why Buy Polarised?:
Light waves travel in all directions: horizontally, vertically, and on every plane in between. When light strikes a surface, some waves are reflected. The reflected light waves tend to vibrate in parallel planes. This uniform, non-random concentration of reflected light is commonly referred to as glare. Glare is not only unpleasant but is a common cause of eye strain and fatigue; it can also be dangerous because it reduces contrast and visual acuity.

Sources of glare include: water, snow, airborne water particles, dust, buildings, concrete, ice, sand, wet and dry road surfaces, and windshields.

 

Polarised lenses are designed to substantially reduce or eliminate reflective glare by selectively absorbing the light waves travelling in all directions except the vertical plane. The term “polarised” is used to describe light that has passed through a polarising filter. As a result of passing through the filter, the transmitted light travels in a uniform pattern.

Ordinary darkly tinted sunglasses do not remove glare and may reduce vision by limiting the amount of light entering the eye. It is not necessary to apply additional tint to polarised lenses because performance is gained by cutting glare and allowing a greater transmission of light. This results in better overall vision.

The exclusive ZB-13 POLARISED blended ‘sepia’ lens colour soothes your eyes, enhances vision and allows for your eyes to adjust to the always-changing light conditions. It provides the optimum blend of contrast, clarity and light transmission for all day COMFORT for your eyes.

 

The layered polarised lens filter cuts out the glare experienced with outdoor environments and means enhanced vision in a wider range of conditions.

 

Complete with Lifetime Warranty - Zeal Optics offer a liftetime warranty on all Zeal Optics eyewear on manufactural defect cases. Lenses are excluded from this warranty unless a manufacturer defect or lens os discovered. Normal wear or abuse cases are not covered under this limited warranty.

 

Zeal Optics Features Include:

  • Reversible, adjustable nose pads for custom fit - prevents eyelash rub
  • Co-injection silicon temple pads for a durable and comfortable fit
  • Polycarbonate lenses, full UVA, UVB, UVC & IR protection
  • Bonus Protective Hard Case Included


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Zeal Optics Tensai Mens Polarised Glasses Optics Eyewear

Zeal Optics Tensai Mens Polarised Glasses - £69.95

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Matte Grey


Specs

Specifications:

 

Why Buy Polarised?:
Light waves travel in all directions: horizontally, vertically, and on every plane in between. When light strikes a surface, some waves are reflected. The reflected light waves tend to vibrate in parallel planes. This uniform, non-random concentration of reflected light is commonly referred to as glare. Glare is not only unpleasant but is a common cause of eye strain and fatigue; it can also be dangerous because it reduces contrast and visual acuity.

Sources of glare include: water, snow, airborne water particles, dust, buildings, concrete, ice, sand, wet and dry road surfaces, and windshields.

 

Polarised lenses are designed to substantially reduce or eliminate reflective glare by selectively absorbing the light waves travelling in all directions except the vertical plane. The term “polarised” is used to describe light that has passed through a polarising filter. As a result of passing through the filter, the transmitted light travels in a uniform pattern.

Ordinary darkly tinted sunglasses do not remove glare and may reduce vision by limiting the amount of light entering the eye. It is not necessary to apply additional tint to polarised lenses because performance is gained by cutting glare and allowing a greater transmission of light. This results in better overall vision.

The exclusive ZB-13 POLARISED blended ‘sepia’ lens colour soothes your eyes, enhances vision and allows for your eyes to adjust to the always-changing light conditions. It provides the optimum blend of contrast, clarity and light transmission for all day COMFORT for your eyes.

 

The layered polarised lens filter cuts out the glare experienced with outdoor environments and means enhanced vision in a wider range of conditions.

 

Complete with Lifetime Warranty - Zeal Optics offer a liftetime warranty on all Zeal Optics eyewear on manufactural defect cases. Lenses are excluded from this warranty unless a manufacturer defect or lens os discovered. Normal wear or abuse cases are not covered under this limited warranty.

 

Zeal Optics Features Include:

  • Reversible, adjustable nose pads for custom fit - prevents eyelash rub
  • Co-injection silicon temple pads for a durable and comfortable fit
  • Polycarbonate lenses, full UVA, UVB, UVC & IR protection
  • Bonus Protective Hard Case Included

Your Eyes:


The eye is one of the most sensitive and valuable organs of the body, and requires maximum protection from damage. Although the sun is necessary and beneficial to our existence, when it’s light rays (especially ultraviolet light) act upon the unprotected eye, damage to this vital organ may occur. The cornea is your eye's first barrier of defence against the sun's harmful rays. It is a transparent layer of cells covering the outermost surface of the eye. Day to day exposure to ultraviolet light causes constant minor damage to the cornea that is quickly and continually repaired. However, intense ultraviolet light reflected from sand, water, or snow can overwhelm the repair mechanisms and produce corneal burn (known as snow blindness or photokeratitis).

 

The symptoms of photokeratitis - the sensation of having something in the eye or, in more severe cases, pain, tears, and intense sensitivity to light - usually develop after a period of four or five hours of intense exposure to the sun. Even if untreated, photokeratitis usually lasts only one or two days. Any ultraviolet light that gets past the cornea next encounters the lens of the eye - a transparent, elastic structure responsible for focusing light on the retina.

 

The lens absorbs the remaining ultraviolet light and passes only visible light to the retina. Unlike the cornea, the lens has little ability to repair itself; damage is cumulative and permanent. Recent evidence suggests that chronic, lifetime exposure to UV contribute to some types of cataracts (opaque regions in the lens that interfere with vision).

 

Light reaches its final destination when it strikes the cells of the retina, the innermost layer of the eye. Pigment in these cells (called rods and cones) absorbs light and initiates a series of chemical and electrical changes that convey visual information to the brain. The chemical changes associated with vision are reversible, and the pigment is also constantly renewed. It is possible however, that light at the blue end of the visible spectrum damages important proteins in the retina that are not easily repaired. The macula lutea is a portion of the retina located directly in line with the centre of the lens. It is densely packed with light detectors and is responsible for what is known as central vision. In some people the macula degenerates after 50 or 60 years of service.

 

Although total blindness does not result, the condition can be frustrating or disabling: the ability to read or to use the eyes for other kinds of detailed perception is lost. Given the combination of proven and possible eye injury from ultraviolet light, sunglasses would seem like a good investment - especially for people in sunny climates, those with outdoor occupations, and for those who favor outdoor recreation.


Light:


To understand sunglasses and the need for them, it is important to understand light. That is a question that has puzzled philosophers and physicists for years.

 

Here's what is known: The sun emits a broad spectrum of electromagnetic energy that ranges from cosmic rays at one end to radio waves at the other. Light is an electromagnetic wave.

 

Light travels at a speed of 186,000 miles per second.

 

Wavelengths of light are measured in nanometers (I nanometer = I billionth of a meter in length). Light's wavelength determines its colour. Generally speaking, shorter wavelengths carry more energy and potential for damage to your eyes. The electromagnetic spectrum consists not only of the visible light that we detect with our eyes but also invisible rays as well. These regions differ in terms of their frequencies, wavelengths and how they interact with each other.

In the sunglass world, we are concerned with the regions of the spectrum that affect our eyes. These are the ultraviolet, visible, and infrared wavelengths.


Ultraviolet Light:


Ultraviolet light, with wavelengths from 0 - 380 nanometers, is the light just short of visible light. There are three types or classes of ultraviolet rays:

 

UVC: UVC rays are the highest energy ultraviolet rays and are thought to be carcinogenic. They occupy a range from 200 - 290 nanometers. Fortunately, UVC rays are absorbed in the ozone layer of the atmosphere, so few, if any, reach the earth.


UVB: UVB rays, from 290 - 315 nanometers, are the trouble rays of ultraviolet light and the ones that should be of most concern for the sunglass wearer. These rays, the same ones that produce sunburn, are absorbed by the cornea.

 

As previously mentioned, UVB rays can damage corneal cells. But under normal conditions the cornea repairs itself so rapidly that it usually keeps up with the assault. Under extremely bright conditions, prolonged UVB exposure can overwhelm the cornea's repair processes, causing painful snow blindness (photokeratitis), Even so, the cornea will usually recover within a day or two.


The chief worry about UVB damage centres on the lens of the eye. Although ultraviolet light does not detectably damage the lens in the short term; continuous, lifetime exposure to UVB may contribute to the formation of cataracts.


UVA: UVA rays, from 315 - 380 nanometers, cause tanning and premature ageing of the skin. UVA also passes through the outer structure of the eye and is absorbed by the lens.

 

Although UVA can be detrimental, it is much less harmful than UVB. STANDARDS FOR SUNGLASSES AND UV PROTECTION Sunglass use categories are standards prepared by the American National Standards Institute (ANSI). The ANSI standard is the only recognised criterion for the properties of performance of non-prescription sunglasses and fashion eyewear. ANSI put sunglasses into three categories:


Cosmetic Sunglasses: These lightly tinted lenses are for use in non-harsh sunlight like shopping and around town uses. These sunglasses block at least 70% of UVB and may block up to 60 % of visible light. UVA protection must be at least as great as visible light protection.

 

General Purpose Sunglasses: These are medium to dark tinted lenses for use in any outdoor activity like going to the beach, boating, hiking, and snow use. These sunglasses must block at least 95% of UVB, 60-92% of visible light, and at least 60% of UVA.

 

Special Purpose Sunglasses: These lenses are recommended for very bright conditions like mountain climbing. These sunglasses must block at least 99% of UVB, 97% of visible light, and up to 98.5% of UVA.


The UV Index:


Developed by the National Weather Service and the Environmental Protection Agency, the UV Index provides you with a measure of the relative intensity of the sun's UV radiation. The greater the UV radiation, the higher the index number.

 

Exposure Category
UV Index Value
Minimal
0-2
Low
3-4
Moderate
5-6
High
7-9
Very High
10+


The UV Index can be found on TV (The Weather Station), radio, or in
newspapers.

 

What affects the UV Index?:

Time of Day: UV radiation is greatest at midday. In fact, over 50% of daily UV radiation occur between the hours of 10:00 a.m. and 4:00 p.m.


THE SEASON: UV RADIATION IS HIGHER IN SPRING, SUMMER, AND AUTUMN THAN IT IS IN WINTER.


Cloud Cover: Thick, heavy clouds absorb most UV radiation. In general, he darker the clouds, the less the UV radiation. But extra care should be taken under thin clouds. While the sun's rays may not feel as hot, they can still cause damage because UV radiation passes through thin clouds. Also, watch out for hazy conditions; haze does not block UV radiation.

 

The Environment: You get higher exposure to UV radiation on snow, sand, water, or concrete, as these surfaces reflect the suns rays. You'll also get higher UV radiation at higher altitudes and areas closer to the equator.


Glare:

 

The same bright sunlight that draws us outdoors, can also cause eye strain and fatigue. These discomforts are often the result of glare from light reflected off many of the surfaces that surround us.

 

Glare is not only unpleasant; it can also be dangerous because it reduces contrast and visual acuity. Sources of glare include: water, snow, airborne water particles, dust, buildings, concrete, ice, sand, wet and dry road surfaces, and windshields.

Preventing Eye Damage:


Because UV rays can cause cataracts and other serious eye conditions, doctors recommend that you wear sunglasses that absorb 99-100 percent of the full UV spectrum when outdoors in bright sun. Because there is now no uniform labelling of sunglasses, read labels carefully.

 

Be careful of buying sunglasses that 'block harmful UV' without saying how much. Wear a hat with a wide brim to protect against UV exposure, and if you wear sunglasses, too, you provide even more protection for your eyes.

 

Parents whose children will not wear sunglasses, can still help protect their children's eyes by making sure they wear a hat with a wide brim.

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