Ray-Ban uses four different kinds of lenses for 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 only can be found in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of all UV rays and permit only 15% of the visible light to pass through them (that’s an 85% reduction!). These brown lenses provide a little bit more contrast by cutting down on the amount of blue light, as opposed to a G15 lens (which happens to be described in the next paragraph). Blue light is extremely easily captured from the eye and it has the outcome of softening other colours that are harsher to our own vision. Quite simply, by reduction of the volume of blue light, the differences between colours and brightness of objects will be more pronounced.
The G15 XLT lenses have similar properties as the B15 XLT lenses, however they’re of greyish/greenish colour. The G15 lens is the original aviator lens the military requested Ray-Ban to formulate. The process would be to design a lens which had been “colour neutral”; quite simply, a lens that filters light much like the eye does. Should you prefer a lens that offers a little less contrast between colours, then this G15 XLT lens is designed for you since it offers similar colour-sensitivity on the eye. With a lower contrast lens, the difference in colour and brightness of objects is going to be dampened. Because of this the colours the truth is through these lenses will likely be natural and soft on the eyes.
The B15 and G15 XLT lenses are created from impact resistant optical glass that is certainly naturally scratch resistant. Quality and stability are remarkable as well as over time you will notice basically no fading whatsoever within the colour.
Polarized lenses essentially trim down the level of glare produced by reflective surfaces like water or some other semi-transparent objects, as well as 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 people who are active inside the “horizontal plane”, this means how the bright sunlight bounced horizontally enters the eye in the similar fashion. This will cause the pupils to constrict and significantly reduce contrast. That’s why drivers have difficulty seeing the street ahead of them if they’re driving in very sunny conditions (in case the sun is before them).
Polarized lenses use a laminated surface with vertical stripes that create a filter, which effectively omits the horizontally-polarized light and allows only vertically-polarized light in. Quite simply, if you be on the clear lake you may probably see underneath the surface or maybe 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 in case your car’s windows are tinted.
All 3 lenses are really useful, particularly the polarized ones, but anticipate to pay reasonably limited around the sunglasses.
The lens base simply means the base curve or perhaps the front curve in the lens measured in “diopters”, which is a term that really only matters to opticians. You’ll realize that many cheap ray ban sale possess a “Lens Base 6”, which basically ensures that they’re sufficiently curved and made to to operate as sunglasses (i.e., they cover the eye area enough).
Lens dimensions are measured in millimeters and refers to the length (or width) of merely one lens. Bear that at heart when coming up with an investment. Many Ray-Ban models are available in many different sizes of lens. Be sure you have the size that fits the face or maybe you may end up with a kind of aviator shades that don’t fit properly.