Ray-Ban uses four different types of lenses for their sunglasses. The B15 XLT lens, the ray ban usa, polarized lenses and normal lenses, which we won’t discuss here because there’s nothing special on them (they just can be found in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of most UV rays and let only 15% in the visible light to successfully pass through them (that’s an 85% reduction!). These brown lenses also offer a bit more contrast by reducing on the volume of blue light, instead of a G15 lens (that is described in the next paragraph). Blue light is extremely easily captured by the eye and possesses the outcome of softening other colours that happen to be harsher to your vision. To put it differently, by reduction of the volume of blue light, the differences between colours and brightness of objects tend to be 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 formulate. The challenge would be to design a lens that had been “colour neutral”; to put it differently, a lens that filters light such as the human eye does. Should you prefer a lens that offers a little less contrast between colours, then a G15 XLT lens is perfect for you as it offers similar colour-sensitivity towards the eye. By using a lower contrast lens, the main difference in colour and brightness of objects will be dampened. This means that the colours you see through these lenses will probably be natural and soft on the eyes.
The two B15 and G15 XLT lenses are constructed with impact resistant optical glass that may be naturally scratch resistant. Quality and stability are remarkable as well as over time you will see almost no fading whatsoever within the colour.
Polarized lenses essentially trim down the quantity of glare made by reflective surfaces like water or any other semi-transparent objects, and even some metallic surfaces. Glare refers back 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 those who are active in the “horizontal plane”, it implies 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 road ahead of them if they’re driving in very sunny conditions (in case the sun is in front of them).
Polarized lenses possess a laminated surface with vertical stripes that create a filter, which effectively reduces the horizontally-polarized light and allows only vertically-polarized light in. Quite simply, should you be on the clear lake you can probably see underneath the surface or maybe if you’re driving, you may now see ray1ban road ahead.
Some limitations to polarized lenses are that LCD displays can get distorted or you may notice a “rainbow” effect in case your car’s windows are tinted.
All 3 lenses are very useful, specially the polarized ones, but anticipate to pay reasonably limited in the sunglasses.
The lens base simply signifies the base curve or maybe the front curve of the lens measured in “diopters”, and that is a term that truly only matters to opticians. You’ll discover that many ray ban 90 off possess a “Lens Base 6”, which basically means that they’re sufficiently curved and designed to to operate as sunglasses (i.e., they cover your eyes enough).
Lens dimension is measured in millimeters and signifies the length (or width) of merely one lens. Bear that in mind when you make an investment. Many Ray-Ban models can be found in a number of sizes of lens. Be sure you receive the size that suits your skin or else you may get a pair of aviator shades that don’t fit properly.