The Tinting Technology Used in Sunglasses
Sunglasses are one of the most commonly used accessories by both men and women. They are used not only for style but also to protect the eyes from sun light and also for safety behind wheels as provided by driving sunglasses. There are different techniques used o make them to provide a protective shield for the eyes. Some of these techniques are tinting, polarization, photochromic lenses, mirroring, scratch-resistant coating, anti-reflective coating, and UV coating
In the process of tinting, the color of the tint decides the parts of the light spectrum that are absorbed by the lenses. Sunglass manufacturers use different colors of tints to produce the desired results.
The effect of different tinted glasses
The gray color in tints is used to lessen the overall impact of brightness on the eyes with minimum amount of color deformation. Gray lenses provide very good guard against glare, thus making a preferred choice for driving and also for daily use.
The yellow or gold tints minimize the amount of blue light while permitting a greater percentage of other frequencies through. As the effect of blue light may lead to tends to disperse off a lot of things, it can cause a type of glare called blue haze. The yellow tint nearly eliminates the effect of the blue portion of the spectrum and it makes everything clear and sharp. This is the reason for the use of yellow tint in snow glasses. But this color in tint is not suitable for activities that rely on accuracy in colors as the yellow color tends to distort color.
Amber and brownish tints are also good for general purposes. These colors have an additional advantage of minimizing glare and possess molecules that contain higher frequency colors, like blue, apart from UV rays. Research in this field has shown that near-UV light frequencies like blue and violet can lead to the development of cataracts with time. These sunglasses also disfigure colors like the yellow lenses, but betters contrast and clearness.
Lenses with green tints sieve some blue light and lessens glare. This color in the tint is really popular as they provide the greatest contrast and visual sharpness.
Purple and rose tinted glasses offer the greatest contrast of objects alongside a green or blue backdrop. They are appropriate for activities like hunting or water skiing.
Most of the manufacturers use a procedure called constant density to tint the lenses. This method involves a glass or polycarbonate mixture with a uniform color all over the material. The tint is usually built right into the lenses when they are created. Tinting is also done by applying a coat of light-absorbing molecules to the surface of clear polycarbonate. The most frequently used process for tinting polycarbonate lenses is to submerge the lenses in a special liquid comprising of the tinting material. The plastic slowly absorbs the tint and for a darker effect it has to be left in the liquid for a little longer.
The color of the tint should be chosen depending on the need. For instance the gray color tints are ideal for driving sunglasses and darker sunglasses are ideal for sporting events. Apart from the color of the tint one should also ensure that the sunglasses cover the entire eye to get the maximum protection from light.