Lens tint can sometimes be a bit confusing when purchasing a pair of sunglasses, and understanding the importance - or lack thereof - of lenses
tint can be easily misunderstood.
The first thing you need to know is that sunglasses lenses are constructed
out of several different materials like polycarbonate, plastic and mineral crown glass. Each material has its advantages and disadvantages; however, as technology improves some of these differences are disappearing.
Polycarbonate lenses have traditionally been lighter than glass and therefore somewhat more popular than glass lenses. However, polycarbonate lenses have a number of deficiencies associated with them:
Plastic lenses preceded polycarbonate lenses and were used because of their lighter weight. However, long exposure to ultraviolet radiation can change the molecular structure of plastic lenses over time, and they can warp and become misshapen with exposure to high temperatures.
Mineral Crown Glass Lenses
Mineral Crown glass lenses are also known as high-index lenses, and with modern technology they have become much thinner, and therefore lighter, than earlier glass lenses. This is due to the higher refractive indexes now available in glass lenses making them at least 50% thinner than conventional plastic lenses.
High Index Mineral Crown Glass Lenses have many benefits:
Lens tint is sometimes confused with how dark the lenses are, and some people feel that the darker the lenses the more effective they are. Unfortunately this is a false assumption.
The dangerous rays you want to protect your eyes from are ultraviolet light rays (uv radiation), and these light rays are not in the visible light range. Therefore it is not how dark or light the lenses are that determines their effectiveness in blocking these harmful uv rays, but rather the coatings applied to the lenses!
The Importance Of Lens Tint
The importance of lens tint has to do with visual acuity - your ability to see objects through the lens clearly and with precision. Each lens tint relates to a specific issue the wearer may encounter. Some of these relationships are as follows:
The bottom line here is you need to be better informed about lens tint and how it impacts the performance of your pair of sunglasses rather than an assumption that darker is better.
In fact the Federal Aviation Administration (FAA) has issued a Safety Brochure titled "Sunglasses For Pilots: Beyond The Image"
which provides even more useful information.
In addition recent research has shown that tinted sunglasses
may help with migraine headaches.
Have a prosperous day!
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