Sunglasses are an eye care device indicated for protection from ultraviolet ( UV ) rays. In summer, when there is a greater opportunity for outdoor time and exposure to reflective surfaces (beach, sea or meadow) the eyes are highly stressed and require special care, at the same time skin is exposed to the sun .
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Sunglasses: what are they?
The sunglasses as ” Personal Protective Equipment” (PPE). Ophthalmic lenses equipped with selective filters for ultraviolet rays (UV) perform, in fact, the function of protecting the ocular structures from the risks due to solar radiation. For this reason you can buy sunglasses online from wholesale sunglasses, sunglasses must be manufactured in a workmanlike manner and comply with pre-established safety and quality standards.
Sunglasses: what are they for?
Sunglasses are essential protection in order not to compromise sight, as they shield the ultraviolet (UV) radiation from the sun and reduce intense brightness, responsible for a reduction in visibility and various ailments such as: eye irritation, eyelid dermatitis , conjunctivitis and keratitis.
Furthermore, ultraviolet rays trigger an excessive production of free radicals , responsible for the aging of cells and tissues (including eyes). Over time, this phenomenon can favor the progressive opacification of the lens (a structure that filters and projects light on the retina ) which can lead to the development of cataracts. Blue light – in the visible spectrum, bordering UV rays – instead increases the risk of macular degeneration .
Ultraviolet radiation: what to know
The sunglasses are equipped with an anti-UV filter, capable of absorbing type A and B radiation (UVA and UVB), which are more harmful to the eye than those of visible light.
Ultraviolet rays derive largely from the sun and comprise the portion of the electromagnetic spectrum with a wavelength between 100 and 400 nanometers (nm).
How do sunglasses work?
An ophthalmic lens acts by essentially modifying the vergence of a beam of radiation; the filters with which they are made alter the energy composition by preventing the passage of some wavelengths or by limiting the energy of these.
The lenses of the sunglasses are equipped with anti-UV filters which act by modifying the energy characteristics of ultraviolet radiation. Sometimes UV protective coatings are added to these filters to block all radiation up to 400 nm.
The treatment does not cause loss of brightness: an absolutely transparent material can be “filtering” while acting on invisible wavelengths. It should be known, in fact, that the screen against ultraviolet rays is not given by the color, but by the filtering power of the sunglasses, indicated with a number from 0 to 4 and affixed in the form of a mandatory adhesive to the lens.
On the other hand, however, it is obvious that colored sun lenses (gray, brown, green, etc.) reduce color perception.
What advantages do sunglasses offer?
Sunglass lenses attenuate the effects of diffuse and often annoying radiation. Consequently, the vision with sunglasses is clear and comfortable, especially in very bright environments and open spaces. This feature is to be taken into consideration in the practice of recreational or outdoor sports activities (fishing, cycling, winter skiing , water sports, etc.) and in situations in which it is necessary to protect oneself from very intense sunlight or its reflection (sea, lake, snow, ice, sand, meadow and rivers).
Sunglasses easily block UVA and UVB rays
As with the skin, excessive or unregulated exposure to sunlight can be harmful to your eyesight. Sunglasses with sunglasses limit and prevent the harmful effects of these radiations.
The most exposed to damage from the sun’s rays are children and the elderly, for whom it is necessary to choose glasses capable of breaking down both UV rays and the so-called “blue light”, less known, but equally dangerous, co-responsible in determining both the opacity of the lens and the maculopathy.
Increase visual comfort
The lenses with anti-UV filters make viewing more comfortable in environmental conditions where the brightness is very intense. In sunny weather conditions, the result is sharper vision and less tiring to the eye. In fact, sunglasses reduce eye fatigue, as sight is not forced to compensate for reflection and other phenomena deriving from intense light.