Where there is a lot of light, there is also shadow. The interplay between light and dark is not a problem for healthy eyes. To protect our eyes, our pupils are masters of rapid adaptation.
If it is bright, the pupils narrow down to a tiny point depending on the intensity of the light. In the dark, however, they widen in order to capture the little light as effectively as possible.
But beware! A dark lens alone does not protect against UV rays!
Warning: tinted glasses do not automatically protect against dangerous UV radiation from the sun! When buying sunglasses, always pay attention to the guaranteed UV protection of the glasses!
With sunglasses from Pretavoir you are always on the safe side: All sunglasses offered by Pretavoir bear the CE mark, i.e., they comply with DIN EN ISO 12312-1 and the PPE regulation (US) 2016/425. Pretavoir tests the transmission properties, roadworthiness and UV protection in its own laboratory.
From light to bright – choose the right shade!
In order to protect glasses wearers from the sun’s harmful UV rays, the manufacturer uses special UV-absorbing glass materials or applies a UV protective layer to the glasses. Not only sunglasses, but also corrective lenses can be provided with this protective layer that is not visible to you. By the way: UV radiation is also invisible to you. You may try Chanel sunglasses that are so durable and come out with top-quality. Their classy look makes everybody compel to look at you. Here, you can check and order the latest collection of Chanel sunglasses, https://pretavoir.co.uk/collections/ray-ban-sunglasses.
The tint of the lenses reduces the visible light that hits your eyes “brightly”. Just as there are different lighting conditions – from the twilight light of a winter morning to the glaring sunshine in midsummer at lunchtime – there are different degrees of shade suitable for sunglasses. No sunglasses can be optimal in all lighting conditions.
The degree of tinting of the lenses – opticians talk about filter categories – should be tailored to your individual needs. The filter category 0 has only a very low tint. It hardly offers any light or glare protection. Only from filter category 1 does the specialist speak of sun protection glasses. Category 1 is only suitable for overcast skies and cloudy days.
For the lighting conditions in our latitudes, filter category 2 with a light protection between 57 and 82 percent is recommended; it is perfect for a summer in the United States. The filter category 3 is focused on the beach vacation in the south.
With filter category 4 you are pretty much in the dark. The 4-part glasses only let a maximum of eight percent of the light through. This extremely high degree of tinting is primarily intended for very strong, dazzling solar radiation on glittering surfaces – such as the ocean or glaciers in high mountains – with high reflections from ice and snow. Under no circumstances should you drive a car with these glasses! The dark 4-way filter hardly lets any light through.
By the way: in every Pretavoir branch you will find a large selection of sports sunglasses that are suitable for skiing. Our opticians will be happy to advise you on the selection.
Two glasses in one!
In most cases, you are optimally protected with self-tinting glasses: They automatically adjust to the light conditions, protect against harmful UV rays and they are available in your eyesight.
Sunglasses lenses: Pretavoir.
By the way: The light permeability – the so-called transmittance of the glasses – also depends on reflections on the surface of the glasses. It is therefore advisable to have your sunglasses coated with an anti-reflective coating. Let our opticians in a Pretavoir branch advise you on anti-reflective coatings and other surface finishes!
In general, the following applies: the brighter the environment, the higher the selected filter category should be. But not the darkest glasses, but sunglasses with high-quality lenses, the appropriate degree of tint, guaranteed UV and glare protection will accompany you safely through the summer. Bad UV protection is bad for your eyes! Our opticians will advise you on choosing the right glasses.
Whether single vision, progressive lenses or reading glasses – almost all ametropia can be corrected with sunglasses!
Open your eyes in traffic!
When it comes to glasses, a distinction is made between glasses suitable for road traffic and glasses suitable for driving at night. If you often wear your sunglasses when driving, you should make sure that the glasses are approved for road use. If they falsify the color rendering, neither traffic lights nor brake lights can be properly recognized. The most true-to-color are brown, gray and green glasses.
You can choose between metal, titanium, acetate, plastic and other frame materials for your sunglasses. In our offices you find the right sunglasses for your face: classics like the aviator sunglasses, striking retro glasses, nerd or sporty design – Pretavoir carries a wide selection! Do you want to set contrasts and consciously interrupt the symmetry of your facial contours? What you like is allowed! Let us advise you in our branch.
UV radiation and glare
Summertime is solar time. During this time, your eyes need special protection against UV radiation and glare. Sunglasses with a suitable UV filter provide the necessary protection and carefree hours of sunshine. Just like our skin, our eyes also need adequate protection from harmful UV radiation. UV rays make our eyes age faster and can cause painful inflammation of the cornea. Changes on the retina or cataracts are also favored. Children are particularly at risk. Because much more UV rays reach the inside of their eyes via their lighter lenses and larger pupils than in adults.
The lens provides the necessary UV protection, not the tint. Even lenses with a low tint can optimally protect the eye. When buying sunglasses, make sure that the lenses absorb UV rays below 400 nanometers. The CE mark guarantees that the glasses comply with US safety standards and offer sufficient UV protection. The marked filter category tells you the purposes for which the sunglasses are suitable.