Posts

The election this summer: polarized glasses? 

consells_ulleres_sol_bioptic_salut_visual

Despite the fact that polarized glasses exist since many years ago, these glasses are considered as fashion since three years ago. But, if the sales of this sunglasses style keep going during so many years is not only because these are fashion, but because of their usefulness.

When we put on sunglasses, the pupil gets dilated. This means that without an adequate protection against ultraviolet rays (UV), the sun can affect more negatively on our eyes and can even lead to lesions. In this sense, the polarized glasses can also offer a UV protection of the 100%.

Which other advantages do they have?

  • These fight light from all angles: the sun light reaches our eyes from all possible directions. In fact, there are typical situations in summer time that multiply the angles where the light comes from: the reflection of the sea water, swimming pools and asphalt. The polarized glasses have a special filtre that avoids all reflections coming from horizontal surfaces.
  • Vision without reflections that improves the visibility.
  • The clarity and contrast of what we see is superior.
  • These glasses are adequate for people with high sensibility to light and also for children.
  • As any other lens, this diminishes the eye fatigue.
  • These glasses can be prescription glasses.
  • Needs to be mentioned the fact that, as disadvantage, in some cases the polarized glasses diminish the visibility of cell phones screens, GPS or other devices. Despite this, these are the most recommended, even more for those who spend lots of hours under the sun light and are exposed to situations where the light reflection multiplies, such as, for example, people fond of navigation, beach or those who drive during many hours.

The 5 advices to choose appropriate sunglasses

consells_ulleres_sol_bioptic_salut_visual

Do you know that the sun overexposure can cause eye problems such as photokeratitis (corneal injury) or favour the development of cataracts or macular degeneration? The election of appropriate sunglasses is not only a  matter of fashion, but a matter of visual health. Biòptic provides you with 5 advices in order to get right with your choice:

1. UV protection glasses:

It is essential to check the UV, ultraviolet rays abbreviation, grade. The need of more or less protection will depend on the glasses usage. During the summer, it is necessary a protection grade between 81% and 92% of absorption, which is adequate for a medium and high sun brightness.

Glasses must be used at all hours, since the UV rays, even though they are imperceptible, these are also present when cloudy days. Generally this information is indicated on the glass sticker.

2. Which type of glass must be chosen?

Polarized: this is the glass that protects the most par excellence. All the residual reflections are avoided with the polarized filtre.

Sunsitive: these glasses are used by sportsmen that play activities where they move from direct light to shadow; the glass varies its tone depending on the quantity of light.

Degraded: the most chosen glasses because of aesthetics reasons; the tone of these glasses is more clear gradually. That is, the upper part is darker and the lower part is more clear. These are adequate to wear indoor and when it is not very sunny.

Uniform: the colour of the glass is uniform and this is the most usual way we find sunglasses.

3. A frame that protects the eyes from all angles:

–The large variety of frames makes us choose the best one according to our face shape in order not to leave any crack where the sun can get into and also that these suit us:

–Heart shape face (wide forehead and pronounced chin): the aviator style of glasses is recommended.

–Square face (wide forehead and jaw): the glasses that are recommended in order not to give too much protagonism to the forehead are the oval glasses or those that do not have the upper line straight.

Round face (wide forehead and voluminous cheeks): one must not choose round shapes and select rectangular ones, which are glasses that are wide in the upper part and narrow in the inferior one.

4. Children, the most vulnerable to sun:

Do you know that it is not until the age of 12 that the crystalline is completely formed and the retina is not yet protected? In the same way that we protect children’s skin from the sun, we must also protect their eyes. Special care must be taken into account when protecting their vision.

5. Optician’s as quality filtres:

The best way to choose sunglasses is consulting experts. That is why going to the optician’s to find the sunglasses for this summer means a secure purchase. Listen to experts’ advice.