Ray-Ban uses four different kinds of lenses with regard to their sunglasses. The B15 XLT lens, the ray ban sale, polarized lenses and normal lenses, which we won’t discuss here because there’s nothing special about them (they only are available in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of most UV rays and permit only 15% of the visible light to move through them (that’s an 85% reduction!). These brown lenses also offer much more contrast by cutting down on the volume of blue light, instead of a G15 lens (that is described over the following paragraph). Blue light is quite easily captured by the eye and has the result of softening other colours which can be harsher to our vision. In other words, by reducing the amount of blue light, the differences between colours and brightness of objects are definitely more pronounced.
The G15 XLT lenses have the same properties since the B15 XLT lenses, however they’re of greyish/greenish colour. The G15 lens is definitely the original aviator lens how the military requested Ray-Ban to produce. The challenge would be to design a lens which was “colour neutral”; quite simply, a lens that filters light just like the human eye does. If you want a lens which offers a little less contrast between colours, then your G15 XLT lens is made for you since it offers similar colour-sensitivity on the human eye. Using a lower contrast lens, the main difference in colour and brightness of objects will probably be dampened. Because of this the colours the thing is through these lenses is going to be natural and soft in the eyes.
Both B15 and G15 XLT lenses are made from impact resistant optical glass that is certainly naturally scratch resistant. Quality and stability are remarkable and also over time you will notice hardly any fading whatsoever in the colour.
Polarized lenses essentially cut down the amount of glare produced by reflective surfaces like water or another semi-transparent objects, as well as some metallic surfaces. Glare refers back to the difficulty of seeing in bright light.
Sunlight, as an example, bounces off surfaces in all of the directions (i.e. vertically, horizontally or diagonally). For individuals that are active within the “horizontal plane”, it implies how the bright sunlight bounced horizontally enters the attention in a similar fashion. This will cause the pupils to constrict and significantly reduce contrast. That’s why drivers have difficulty seeing the road prior to them if they’re driving in very sunny conditions (if the sun is prior to them).
Polarized lenses use 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. To put it differently, if you happen to be on the clear lake you can probably see within the surface or if perhaps you’re driving, you may now see ray1ban road ahead.
Some limitations to polarized lenses are that LCD displays can become distorted or else you may notice a “rainbow” effect when your car’s windows are tinted.
All 3 lenses are extremely useful, specially the polarized ones, but anticipate to pay limited around the sunglasses.
The lens base simply means the base curve or perhaps the front curve of the lens measured in “diopters”, that is a term that actually only matters to opticians. You’ll learn that many ray ban 90 off use a “Lens Base 6”, which basically implies that they’re sufficiently curved and built to to operate as sunglasses (i.e., they cover your eyes enough).
Lens dimension is measured in millimeters and refers back to the length (or width) of just one lens. Bear that under consideration when coming up with any purchase. Many Ray-Ban models may be found in many different sizes of lens. Be sure you receive the size that suits the face or you may end up with a pair of aviator shades that don’t fit properly.