Ray-Ban uses four several types of lenses for 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 on them (they merely are available in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of Ultra violet rays and enable only 15% from the visible light to move through them (that’s an 85% reduction!). These brown lenses also offer a little bit more contrast by cutting down on the volume of blue light, as opposed to a G15 lens (which can be described in the next paragraph). Blue light is incredibly easily captured from the eye and has the impact of softening other colours which are harsher to the vision. In other words, by reduction of the quantity of blue light, the differences between colours and brightness of objects are definitely more pronounced.
The G15 XLT lenses have similar properties since the B15 XLT lenses, however they’re of greyish/greenish colour. The G15 lens is the original aviator lens that the military requested Ray-Ban to develop. The problem would be to design a lens that was “colour neutral”; in other words, a lens that filters light such as the eye does. If you need a lens which offers a little less contrast between colours, then this G15 XLT lens is perfect for you since it offers similar colour-sensitivity to the human eye. With a lower contrast lens, the difference in colour and brightness of objects is going to be dampened. Because of this the colours you see with these lenses will probably be natural and soft in the eyes.
Both the B15 and G15 XLT lenses are made from impact resistant optical glass that may be naturally scratch resistant. Quality and stability are remarkable and also over time you will notice hardly any fading whatsoever from the colour.
Polarized lenses essentially decrease 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 to the difficulty of seeing in bright light.
Sunlight, by way of example, bounces off surfaces in most directions (i.e. vertically, horizontally or diagonally). For individuals that are active within the “horizontal plane”, it implies that the bright sunlight bounced horizontally enters the attention in a similar fashion. This leads to the pupils to constrict and significantly reduce contrast. That’s why drivers have difficulty seeing the road in front of them if they’re driving in very sunny conditions (in the event the sun is before them).
Polarized lenses have got a laminated surface with vertical stripes that produce a filter, which effectively reduces the horizontally-polarized light and allows only vertically-polarized light in. Put simply, should you be over a clear lake you can probably see underneath 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 get distorted or perhaps you may notice a “rainbow” effect if your car’s windows are tinted.
All 3 lenses are incredibly useful, particularly the polarized ones, but anticipate paying reasonably limited around the sunglasses.
The lens base simply means the base curve or maybe the front curve of your lens measured in “diopters”, that is a term that truly only matters to opticians. You’ll find that many ray ban sale 90 off possess a “Lens Base 6”, which basically ensures that they’re sufficiently curved and made to to work as sunglasses (i.e., they cover the eyes enough).
Lens size is measured in millimeters and refers to the length (or width) of just one lens. Bear that at heart when creating any purchase. Many Ray-Ban models come in several different sizes of lens. Be sure you obtain the size that suits the face or you may get a kind of aviator shades that don’t fit properly.