• May 8, 2024

The choice of sunglasses It is based on two points: first, it provides a vision comfortable and second that has a maximum protection of the eyes. Only after these two requirements have been met should the aesthetic component be assessed.

The property that a telescope has to filter ultraviolet radiation is known as UV filter , is given by the addition of chemical substances (chromophores) to material of the lens, during its manufacture. These chromophores are the ones that absorb UV radiation and have little or no effect on the color of the lens.

Find the best one for you ...

The acquisition of lenses for Solar protection sometimes it can be difficult, we find lenses that filter (block) the ultraviolet light , the blue light, the infrared ; and others that have color in the glass, but do not have pre-screening filters.

1.Lens blockers of 99% UV radiation

This type of lens is what we should to buy to protect us from the sun Some lenses may bring a text referred to "absorption up to 400 nm ", which is the same as saying: 100% UV filter . When we buy this type of glasses we have to make sure that the 99% blocking feature has the Factory guarantee .

2. 90% blocking lenses

​ Actually the eyes tolerate the low levels of infrared rays coming from the sun, in any case these are recommended for those with little melanin in the eye (light colors).

3. Blocking lenses of the blue band

Although glasses are made with this type of filter, it is still questioned how harmful this light is. They are usually colored yellow or amber, which supposedly improves the definition of distant objects, especially in snow and fog. For this reason these lenses are popular among skiers, pilots and hunters .

4. Polarized lenses

They cut the reflections caused by the Sun rays that affect reflective surfaces such as pavement or water. They are useful for driving or fishing. Although polarization has no effect on the absorption of UV rays, Many lenses of this quality are now combined with substances that block the ultraviolet light.

5. Photochromic lenses

This crystal responds automatically to the intensity of ultraviolet light, darkening when there is a lot of light and clarifying with the low lighting. Although they can be good blockers, the ability of the eye to adapt to different illuminations ceases to be optimal.

What color should the lenses be?

The color does not indicate anything about the protective properties of Ray. The choice of lens color depends on personal preferences, although we recommend that you take into account the following details:

1. Gray: does not alter the color perception , but if it is very dark, the contrast decreases
2. Amber and Brown: They seem to offer a more pleasant view and do not significantly alter the colors
3. Green:is the one that most distorts natural colors
4. Yellow: absorb little visible light and can have a good absorption of UV rays, if they are made with the appropriate material. By blocking the blue light, improve visual acuity at night

How dangerous is it to use a lens that does not protect me?

Unfortunately in our market, there are very poor quality lenses that although they can absorb some ultraviolet rays, the eye is not well protected.

Normally these lenses, also block the visible light spectrum, which causes a dilation of the pupil and increase in the ingrso of those UV rays, which do not block properly, to the inside of the eye, causing long-term damage to the retina .

What people should take care of the Ultraviolet Rays?

1. Cataract operators are more vulnerable to ultraviolet radiation , because the lens that blocked a significant amount of the rays, has been extracted.
2. People who use contact lenses without fiUV ltro.
3. Workers exposed to flash of electric welding.
4. People exposed a long time to Sun , or who live in high altitude areas.
5. Patients with alterations of the conjunctiva (pinguecula or pterygium) or macular degeneration.
6. People exposed to lamps sun or solariums.

These suggestions are made, because the exposure to ultraviolet rays is "cumulative", which means that if from childhood we do not protect ourselves from these radiations, we can suffer injuries in the age adult or old age