Ray-Ban uses four different kinds of lenses for 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 about them (they merely can be found in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of most UV rays and allow only 15% from 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 volume of blue light, as opposed to a G15 lens (that is described within the next paragraph). Blue light is quite easily captured with the eye and it has the impact of softening other colours that are harsher to our vision. In other words, by reducing the volume of blue light, the differences between colours and brightness of objects are more pronounced.
The G15 XLT lenses have the same properties as the B15 XLT lenses, however they’re of greyish/greenish colour. The G15 lens will be the original aviator lens that the military requested Ray-Ban to develop. The problem ended up being to design a lens that had been “colour neutral”; put simply, a lens that filters light such as the human eye does. If you need a lens which offers a little less contrast between colours, then your G15 XLT lens is perfect for you since it offers similar colour-sensitivity to the eye. Using a lower contrast lens, the real difference in colour and brightness of objects will be dampened. Which means that the colours you see with these lenses will likely be natural and soft on the eyes.
The two 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 notice basically no fading whatsoever from the colour.
Polarized lenses essentially decrease the level of glare made by reflective surfaces like water or another semi-transparent objects, and in many cases some metallic surfaces. Glare means 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 from the “horizontal plane”, it means the bright sunlight bounced horizontally enters the eye inside a similar fashion. This leads to 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 (if the sun is prior to them).
Polarized lenses possess a laminated surface with vertical stripes that create a filter, which effectively omits the horizontally-polarized light and allows only vertically-polarized light in. In other words, should you be over a clear lake you can probably see under the surface or maybe if you’re driving, now you can see ray1ban road ahead.
Some limitations to polarized lenses are that LCD displays may become distorted or else you may notice a “rainbow” effect if your car’s windows are tinted.
All 3 lenses are very useful, in particular the polarized ones, but anticipate to pay limited in the sunglasses.
The lens base simply refers to the base curve or perhaps the front curve in the lens measured in “diopters”, and that is a term that basically only matters to opticians. You’ll learn that many ray ban sale online have got a “Lens Base 6”, which basically means that they’re sufficiently curved and made to to operate as sunglasses (i.e., they cover the eyes enough).
Lens dimensions are measured in millimeters and means the length (or width) of merely one lens. Bear that at heart when coming up with any purchase. Many Ray-Ban models come in a number of different sizes of lens. Be sure you obtain the size that matches the face or else you may get a set of aviator shades that don’t fit properly.