Ray-Ban uses four several types of lenses for 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 may be found in different colours).
Ray-Ban B15 XLT lenses are brownish in colour, block 100% of most UV rays and let only 15% of your visible light to successfully pass through them (that’s an 85% reduction!). These brown lenses offer a little more contrast by cutting down on the level of blue light, instead of a G15 lens (which is described in the next paragraph). Blue light is extremely easily captured through the eye and possesses the effect of softening other colours that are harsher to your vision. Put simply, by reducing the quantity of blue light, the differences between colours and brightness of objects tend to be more pronounced.
The G15 XLT lenses have the identical properties since the B15 XLT lenses, however they’re of greyish/greenish colour. The G15 lens is definitely the original aviator lens that this military requested Ray-Ban to build up. The problem ended up being to design a lens that was “colour neutral”; put simply, a lens that filters light such as the human eye does. If you need a lens that provides a little less contrast between colours, then the G15 XLT lens is made for you as it offers similar colour-sensitivity on the human eye. Using a lower contrast lens, the visible difference in colour and brightness of objects is going to be dampened. Which means that the colours you can see with these lenses will likely be natural and soft about the eyes.
Both the B15 and G15 XLT lenses are constructed with impact resistant optical glass which is naturally scratch resistant. Quality and stability are remarkable as well as over time you will notice basically no fading whatsoever from the colour.
Polarized lenses essentially trim down the quantity of glare made by reflective surfaces like water or any other semi-transparent objects, and also some metallic surfaces. Glare means the difficulty of seeing in bright light.
Sunlight, by way of example, bounces off surfaces in all of the directions (i.e. vertically, horizontally or diagonally). For folks who are active in the “horizontal plane”, it means how the bright sunlight bounced horizontally enters the attention within a similar fashion. This will cause the pupils to constrict and significantly reduce contrast. That’s why drivers have difficulty seeing the path in front of them if they’re driving in very sunny conditions (in case the sun is in front of them).
Polarized lenses have got a laminated surface with vertical stripes that produce a filter, which effectively omits the horizontally-polarized light and allows only vertically-polarized light in. Quite simply, if you be on a clear lake you can probably see within the surface or maybe 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 in case your car’s windows are tinted.
All 3 lenses are very useful, particularly the polarized ones, but anticipate to pay reduced around the sunglasses.
The lens base simply signifies the base curve or perhaps the front curve of the lens measured in “diopters”, which is a term that truly only matters to opticians. You’ll find that many ray ban 90 off have got a “Lens Base 6”, which basically signifies that they’re sufficiently curved and built to to operate as sunglasses (i.e., they cover the eye area enough).
Lens dimension is measured in millimeters and refers to the length (or width) of merely one lens. Bear that in your mind when making an investment. Many Ray-Ban models come in several different sizes of lens. Be sure you receive the size which fits your skin or else you may end up with a pair of aviator shades that don’t fit properly.