What Are The Best Sunglasses Lenses?

crown mineral glass lens construction

Randolph Engineering crown mineral glass lens material

Crown mineral glass aviator sunglasses lenses are used for the best sunglasses lenses because of their low refractive index, low dispersion factor and their incredible visual acuity.

The refractive index is an indication of how well light can travel through the sunglasses lens material, and the dispersion factor refers to how light is dispersed through a medium. The value of these indices provides a way to gauge the quality of the best sunglasses lenses used in a pair of sunglasses you may be looking to purchase. Relying solely on price will not guarantee you that you have the best quality sunglasses lenses available.

The Importance Of The Refractive Index In Sunglasses Lenses

The refractive index of a substance is a measurement of the speed of light through that medium. For example, the refractive index value of water is 1.33 – in other words, light travels 1.33 times faster in a vacuum than through water. For visible light most transparent media have refractive indices between 1 and 2.

The Importance Of The Dispersion Index In Sunglasses Lenses

A good example of dispersion is a rainbow where the colors are split into bands of light creating a rainbow where you can see the various colors separated from one another. In the best sunglasses lenses you want to have as little dispersion as possible. Dispersion is described by a number called an Abbe number.

Why Are Crown Mineral Glass Lenses The Best Sunglasses Lenses?

Crown mineral glass sunglasses lenses are used in high quality sunglasses because they have a typical refractive index value of ~1.52 and a low dispersion Abbe value of ~60 making them ideal in terms of visible light transmittance through the lenses. Randolph Engineering sunglasses have an Abbe value of ~50, and allow 12 to 18% of visible light to pass through the lens with no distortion and allowing true color reception of visible light rays.

Crown glass refers to a type of soda-lime glass commonly used in windows, and is one of the most common forms of glass manufactured in the world. The process of manufacturing crown mineral glass lenses involves blowing liquid fluid glass into a spherical vessel and then attaching a rod to the molten glass and spinning it into the form of a disc. The disc is then cut into several planes and placed into a mold on a press turntable and then pressed into the concave (or crown) shape.

Borosilicate crown glass is made with boric oxide, zinc oxide, barium oxide, fluorite and phosphorus pentoxide and has excellent Abbe values of 50 to 85 – the lower the number the better the quality of the sunglasses lenses. You can learn more about crown mineral glass at the Lens Compendium.

Many Sunglasses Lens Tint Choices

It is very easy to tint sunglasses lenses and so you will see a great variety of lens tints on the market today. However, there are just a few that are worth considering:

  • Neutral Gray Lenses: these are the best for visual acuity because they allow true color light to pass through the lens;
  • Gray Flash Mirrored Aviator Sunglasses Lenses: these combine the neutral gray tint with a subtle mirror coating for serious style and glare reduction;
  • Tan Lenses: these work exceptionally well for overcast days by providing excellent eye protection and contrast;
  • AGX Lenses: these have a slight green tint which enhances contrast, eliminates eye fatigue and minimizes bright glare;
  • Polarized Lenses: these are the ultimate for extremely bright conditions and glare reduction.

However, be aware that if you use LCD devices such as cell phones and tablets polarized lenses may make the screen difficult or impossible to see.

What To Consider When Choosing Sunglasses Lenses

When choosing a pair of high quality sunglasses it is important to make sure they have the best sunglasses lenses in them to provide the very best visual acuity for the wearer. If you need prescription sunglasses lenses, you can purchase a pair of Randolph Aviator frames and make sure that your optometrist knows that you want crown mineral glass sunglasses lenses. You can learn more about prescription lens frames here on our website.

Randolph Aviator Replacement Lenses

One of the really neat things about Randolph Engineering Sunglasses is that you can purchase replacement lenses for them so if a lens gets scratched you don’t have to buy a whole brand new pair of sunglasses.

The Randolph replacement lenses are easy to install and are of the same quality as the original factory production lenses.

Where To Find High Quality Crown Mineral Glass Sunglasses Lenses Sunglasses

Be sure to start by checking out the Randolph Engineering line of sunglasses, including the world famous Randolph Aviator Sunglasses which have the best sunglasses lenses available on the market today!
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