Ray-Ban uses four different types of lenses with regard to their sunglasses. The B15 XLT lens, the cheap ray ban sale, polarized lenses and normal lenses, which we won’t discuss here because there’s nothing special about them (they merely can be found in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of all the UV rays and permit only 15% from the visible light to pass through them (that’s an 85% reduction!). These brown lenses also offer a little bit more contrast by lowering on the quantity of blue light, rather than a G15 lens (which happens to be described in the next paragraph). Blue light is extremely easily captured through the eye and possesses the impact of softening other colours which are harsher to your vision. In other words, by reduction of the amount of blue light, the differences between colours and brightness of objects are definitely more pronounced.
The G15 XLT lenses have similar properties because the B15 XLT lenses, however they’re of greyish/greenish colour. The G15 lens is definitely the original aviator lens that the military requested Ray-Ban to build up. The challenge was to design a lens which was “colour neutral”; put simply, a lens that filters light just like the eye does. If you prefer a lens that offers a little less contrast between colours, then your G15 XLT lens is made for you because it offers similar colour-sensitivity on the eye. By using a lower contrast lens, the visible difference in colour and brightness of objects will probably be dampened. Which means that the colours the truth is with these lenses will probably be natural and soft in the eyes.
The B15 and G15 XLT lenses are made from impact resistant optical glass that is certainly naturally scratch resistant. Quality and stability are remarkable as well as over time you will notice virtually no fading whatsoever inside the colour.
Polarized lenses essentially reduce the volume of glare manufactured by reflective surfaces like water or any other semi-transparent objects, and in many cases some metallic surfaces. Glare refers back to the difficulty of seeing in bright light.
Sunlight, for example, bounces off surfaces in all of the directions (i.e. vertically, horizontally or diagonally). For folks who are active within the “horizontal plane”, it implies that the bright sunlight bounced horizontally enters the eye in the similar fashion. This causes the pupils to constrict and significantly reduce contrast. That’s why drivers have difficulty seeing the highway prior to them if they’re driving in very sunny conditions (in case the sun is before them).
Polarized lenses have a laminated surface with vertical stripes that produce a filter, which effectively cuts out the horizontally-polarized light and allows only vertically-polarized light in. In other words, if you happen to be with a clear lake it is possible to probably see beneath the surface or if perhaps you’re driving, anyone can see ray1ban road ahead.
Some limitations to polarized lenses are that LCD displays can get distorted or maybe you may notice a “rainbow” effect if your car’s windows are tinted.
All 3 lenses are extremely useful, specially the polarized ones, but anticipate paying a premium around the sunglasses.
The lens base simply signifies the base curve or maybe the front curve of the lens measured in “diopters”, which is a term that basically only matters to opticians. You’ll discover that many ray ban sale 90 off have a “Lens Base 6”, which basically ensures that they’re sufficiently curved and made to to perform as sunglasses (i.e., they cover your eye area enough).
Lens dimensions are measured in millimeters and means the length (or width) of just one lens. Bear that at heart when creating an investment. Many Ray-Ban models may be found in a number of different sizes of lens. Make sure you have the size which fits the face or perhaps you may get a kind of aviator shades that don’t fit properly.