Sunglasses: need or fad?
27
09/17
 

Vision is affected by ultraviolet radiation as well as teguments. Just as we protect the skin with SPF solutions, that's how our eyes have to be protected by wearing sunglasses. The most known effects of exposure to UV radiation in the eye are: cataracts (clouding of thelensin theeyewhich leads to adecrease in vision), macular degeneration (medical condition which may result inblurredorno visionin the center of thevisual field), pinguecula (yellow bump on eye) and pterigion (pinkish, triangular tissue growth on thecorneaof theeye), affecting both aesthetically, but especially at the level of vision quality.

If it was known in the past that exposure to the sun only damages 12-16 in the hot season, now it has increased proportionally with the decrease of the ozone layer and with the global warming, which requires wearing UV-protected sun glasses even in Even in the cold of the year. Also, altitude and surface waters (water, snow, sand) are factors that potentiate the harmful effect of UV rays.



Eyes of children (from the age of 2-3 years) should be protected by the use of sun glasses because the eye structures are still incompletely developed and the effect is cumulative (damage to the lens - which will later lead to cataract).

Choose sunglasses correctly.

Sunglasses have colored components with an anti-UV filter and possibly a polarizing filter.

Colored lenses with anti-UV filter.

Ultraviolet (UV) radiation is a component of sunlight, classified by wavelength in UVA, UVB, UVC. The shorter the wavelength, the higher the energy level and the harmful potential of the exposure.

UVA rays, with the longest wavelength, cause skin tanning and are associated with its premature aging. UVB rays may cause burns in the skin and are most often associated with skin cancer and cataracts; UVC rays have the shortest wavelength and are the most dangerous, but fortunately they are blocked by the ozone layer in the Earth's atmosphere and do not reach the ground.

Acute unprotected exposure may cause damage to the anterior surface of the eye, similar to sunburn in the skin, manifested by pain, redness, strange body sensation, light sensitivity and abundant tear.

Some sunglasses, which have only colored lenses without UV protection, can do more harm than if I did not wear them. They dilated, allowing multiple UV rays to enter the eye and produce irreversible effects on the retina and other ocular structures, along with an unclear view.

Visual transmission (the amount of light transmitted through the lens) is marked on the sunglasses arm and explained in their label:

• Category 0 - 80-100% - effective in cloudy weather without sunshine

• Category 1 - 43-80% - weather with clouds, little sun

• Category 2 - 18-43% - sunny weather

• Category 3 - 8-18% - strong sun, mediums that can cause reflections - water, sand

• Category 4 - 3-8% - strong sun, snow, forbidden to be carried (very low visual transmission)

The hue used to color the lens determines which color of the light spectrum is absorbed by the lens:

• Gray, black - reduces the overall amount of light

• Yellow, gold and orange - reduce the amount of blue light entering the eye. The blue light tends to "scatter" the edges of the objects, creating a halo around them. The yellow filter completely eliminates blue light, making everything clearer, with cleaner edges, so sunglasses recommended for driving night or in fog weather, usually have yellow lenses.

• Mara-absorbs high-frequency light, including blue.

• Green - filters blue light, offers the highest contrast and excellent visual acuity.

• Pink and moves provide the best contrast of objects on a green or blue background. So, it's the best choice for fishing (or other water sports) or hunting.

Lens with polarizing filter

The visible light from the sun is reflected in all directions and propagates in waves, moving in vertical and horizontal planes. When sunlight reflects on a horizontal surface (for example, a road, water, machine hood), it often focuses horizontally, resulting in dazzling shimmering. Vertical light rays are useful to the human eye, but the dazzling horizontal shades mask the vertical light and make it difficult and uncomfortable to see.

The advantages of the polarized lens are: sight without reflection, clear contrasts, natural colors, reduced tired eyes, 100% UV protection.

Patients with refractive errors can opt for sunglasses with diopters.

We provide a wide range of sunglasses that can be easily referenced to your style, needs and possibilities.

Protect your eyes today for your tomorrow health.

 
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