Ray-Ban uses four different types of lenses with regard to their sunglasses. The B15 XLT lens, the ray ban sale 90 off, polarized lenses and normal lenses, which we won’t discuss here because there’s nothing special on them (they just may be found in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of all the UV rays and let only 15% of the visible light to pass through them (that’s an 85% reduction!). These brown lenses also offer a little more contrast by cutting down on the amount of blue light, as opposed to a G15 lens (which happens to be described in the following paragraph). Blue light is extremely easily captured with the eye and possesses the impact of softening other colours that are harsher to your vision. To put it differently, by reduction of the level of blue light, the differences between colours and brightness of objects are more pronounced.
The G15 XLT lenses have the identical properties since the B15 XLT lenses, however they’re of greyish/greenish colour. The G15 lens will be the original aviator lens that this military requested Ray-Ban to produce. The task was to design a lens that had been “colour neutral”; in other words, a lens that filters light much like the human eye does. If you want a lens that offers a little less contrast between colours, then your G15 XLT lens is perfect for you as it offers similar colour-sensitivity towards the eye. Having a lower contrast lens, the main difference in colour and brightness of objects will probably be dampened. Which means that the colours you see through these lenses will likely be natural and soft on the eyes.
Both the B15 and G15 XLT lenses are made of impact resistant optical glass that may be naturally scratch resistant. Quality and stability are remarkable and over time you will see hardly any fading whatsoever from the colour.
Polarized lenses essentially reduce the amount of glare produced by reflective surfaces like water or some other semi-transparent objects, and in many cases some metallic surfaces. Glare means the difficulty of seeing in bright light.
Sunlight, as an example, bounces off surfaces in every directions (i.e. vertically, horizontally or diagonally). For those who are active inside the “horizontal plane”, it indicates how the bright sunlight bounced horizontally enters the attention in a similar fashion. This causes the pupils to constrict and significantly reduce contrast. That’s why drivers have difficulty seeing the highway before them if they’re driving in very sunny conditions (in the event the sun is in front of them).
Polarized lenses have a laminated surface with vertical stripes that produce a filter, which effectively omits the horizontally-polarized light and allows only vertically-polarized light in. Put simply, if you be on a clear lake it is possible to probably see beneath the surface or if perhaps you’re driving, now you can see ray1ban road ahead.
Some limitations to polarized lenses are that LCD displays may become distorted or you may notice a “rainbow” effect when your car’s windows are tinted.
All 3 lenses are very useful, particularly the polarized ones, but anticipate paying a premium in the sunglasses.
The lens base simply refers to the base curve or even the front curve of the lens measured in “diopters”, and that is a term that really only matters to opticians. You’ll learn that many ray ban sale 90 off use a “Lens Base 6”, which basically signifies that they’re sufficiently curved and designed to to work as sunglasses (i.e., they cover the eye area enough).
Lens dimension is measured in millimeters and refers back to the length (or width) of just one lens. Bear that in your mind when creating any purchase. Many Ray-Ban models come in a number of different sizes of lens. Ensure you have the size which fits your skin or else you may end up with a kind of aviator shades that don’t fit properly.