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Solar lenses, all about shades and intensities

The sun is appreciate because it lifts the spirits, warms temperatures and lights our homes. However, the UV rays emitted by it, remain harmful. Sunburn, sunstroke, ... they also weaken the lens and retina of our eyes. That's why it is very important to wear good quality sunglasses.
Behind tinted lenses, the pupil expands because glare is diminished. However, if the UV protection is not maximum, it means that we open wide the door to surrounding UV. A good reason to be well equipped and to choose glasses which correspond to the standards with a good index of protection.

There are several types of sunglasses:

The solid colors with a single solar category and therefore the same color on the entire surface of the glass.

Degraded shades that are particularly aesthetic. The color is dark on the top of the glass and clears down to generally progress from a category 3 to a category 1 or 2.

Variable shades that correspond to photochromic lenses.

 solid lenses
 degraded lenses
photochromic lenses

Intensities and categories

CLASS % ABSORBED LIGHT USE
0 0 to 20% interior lenses
1 20 to 37% dimmed solar brightness, cloudy weather
2 37 to 82 % average solar brightness
3 82 to 92% strong solar brightness, useful at sea and mountain
4 92 to 97 % very strong sunlight (do not use for driving)

The colors 

The main colors of lenses are brown, gray and green.

The brown increases the contrasts of the wearer and is generally suitable for nearsightedness.

The gray renders better the surrounding colors and is generally suitable for farsightedness.

Green is one of two and started to grow thanks to the American fighter pilots. It is suitable for everyone.

The characteristics of these colors are very subjective. It is best to try the shades to get your own idea and see what is most enjoyable and comfortable for you.

Additional treatment

The mirror effect is appreciated for the aesthetics it brings (see without being seen). In addition, it filters more light than a basic lenses and thus reduces glare. When the sun illuminates this "flash" treatment, the light is reflected in all directions.

The polarizing filter blocks the rays in a very specific sense. This helps to reduce glare. This effect is most visible on wet roads, snow, white walls, sand, or when the sun hits the windshield. As the glare is decreased or suppressed, the contrast is increased and the colors are intensified. There is thus a better perception of reliefs and distances.