Ray-Ban uses four various kinds of lenses for sunglasses. The B15 XLT lens, the ray ban 90 off, polarized lenses and normal lenses, which we won’t discuss here because there’s nothing special on them (they only come in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of all the UV rays and enable only 15% of your visible light to successfully pass through them (that’s an 85% reduction!). These brown lenses provide a bit more contrast by reducing on the amount of blue light, rather than a G15 lens (which happens to be described in the next paragraph). Blue light is incredibly easily captured by the eye and contains the effect of softening other colours that happen to be harsher to our vision. Put simply, by reducing the quantity of blue light, the differences between colours and brightness of objects will be more pronounced.
The G15 XLT lenses have the identical properties as 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 produce. The problem would be to design a lens that was “colour neutral”; in other words, a lens that filters light such as the human eye does. If you prefer a lens that provides a little less contrast between colours, then your G15 XLT lens is made for you since it offers similar colour-sensitivity towards the eye. With a lower contrast lens, the main difference in colour and brightness of objects is going to be dampened. Which means that the colours you can see with these lenses will be natural and soft on the eyes.
Both the B15 and G15 XLT lenses are made of impact resistant optical glass that is certainly naturally scratch resistant. Quality and stability are remarkable and also over time you will see basically no fading whatsoever in the colour.
Polarized lenses essentially cut down the quantity of glare produced by reflective surfaces like water or another semi-transparent objects, as well as some metallic surfaces. Glare refers to the difficulty of seeing in bright light.
Sunlight, for instance, bounces off surfaces in most directions (i.e. vertically, horizontally or diagonally). For individuals that are active inside the “horizontal plane”, it implies how the bright sunlight bounced horizontally enters the eye in a similar fashion. This causes the pupils to constrict and significantly reduce contrast. That’s why drivers have difficulty seeing the highway in front of them if they’re driving in very sunny conditions (in the event the sun is ahead of them).
Polarized lenses use a laminated surface with vertical stripes that produce a filter, which effectively omits the horizontally-polarized light and allows only vertically-polarized light in. To put it differently, if you be with a clear lake you can probably see underneath the surface or maybe if you’re driving, anyone can see ray1ban road ahead.
Some limitations to polarized lenses are that LCD displays may become distorted or maybe 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 paying limited on the sunglasses.
The lens base simply signifies the base curve or perhaps the front curve in the lens measured in “diopters”, that is a term that actually only matters to opticians. You’ll discover that many cheap ray ban sale have got a “Lens Base 6”, which basically signifies that they’re sufficiently curved and created to to operate as sunglasses (i.e., they cover the eye area enough).
Lens dimensions are measured in millimeters and refers back to the length (or width) of a single lens. Bear that in mind when you make a purchase. Many Ray-Ban models may be found in several different sizes of lens. Ensure you get the size that fits your facial skin or you may end up with a couple of aviator shades that don’t fit properly.