Now sunglasses has become a staple of a lot of people travel, but a lot of people on the choice of sunglasses have no attention, also don't know how to choose the sunglasses.
So how to choose the right sunglasses?
Recommended reading: what role does the wear polarized sunglasses?
Sunglasses factory ms YC9703 sunglasses C3 black/dazzle colour blue lens should choose uv lens wearing sunglasses is to prevent the light, ultraviolet radiation damage to the eyes, first shading can prevent the dazzling light cause headaches;
Secondly if the ultraviolet ray in sunshine into the retina, cause macular lesion, even produce the eye diseases such as cataracts.
And inferior sunglasses just using colored lenses keep out the light, the pupil will naturally under the weak light amplification, but inferior lenses and without uv protection function, enlarge the pupil can absorb more instead of uv light, easy to cause cataracts, sunlight keratitis, corneal endothelial injury and eye diseases such as macular degeneration.
Lens function 1: the choice of the polarized lens: in order to filter the equality of sunglasses in the water, on land or snow in the direction of dazzling light, special coating on the lens in vertical, is called a polarized lens.
The most suitable for activities, skiing or fishing on the sea, but the ordinary daily life, especially when driving, do not apply, reverse because it will make you more can't see clearly.
2: the antireflection protective lens: the lens is in the surface coated with a thin layer of magnesium fluoride, in order to prevent the strong light reflection, let you see things more clearly and without strong light interference.
To test whether your glasses really using antireflection lenses, glasses can be on the light source, if you can see purple green reflection, then said lenses do have painted antireflection protective film.
3: the colored lenses: also called 'dyeing lens', is in the lens production process, add some chemicals, let the lens present color, to absorb certain wavelengths of light.
This is the most commonly used sunglasses lens type.
4: color lens: the lens effect and color lenses is the same, only is made in different ways, it is the color painted on the surface of the lens, the most well-known is 'gradually layer type the color of the lens', the color is the deepest, and then gradually down.
Is the general prescription sunglasses is more color way lenses.
5: color lenses, also some people called 'photographic lenses.
Because chemicals in lenses to join silver halide, let originally colorless lens, meets the glare, becomes colored lenses, for protection, so it is suitable for indoor and outdoor use.
Then choose picture frame design, the design of sunglasses a lot, you can choose suitable for their own.
related: sun glasses sunglasses