Sunglasses “Lens Colors Decoded”, article by Rachel Johnstone

This short article “Lens Colors Decoded” by Rachel Johnstone, posted on December 13, 2011, helps me understand the visual effects of different sunglasses lens colors. The original article is on this web page http://www.sailingworld.com/gear/lens-colors-decoded.  My takeaways are:

. Lens color choices:

There’s no right lens tint for everyone: personal choice is the determining factor, but the manufacturers have their recommendations:
Grey: Good all-purpose use with no color distortion
Copper: Ideal for variable light and dark or grey water
Yellow: Perfect for low-light, overcast conditions
Blue: (Mirrored lens with grey base tint) Good for blue-dominant conditions, such as the Caribbean
Red: Heightens contrast in variable conditions, causes color imbalances

. With polarized sunglasses comes a range of light transmission rates, meaning, how much light permeates the lens and reaches your eyes. In bright light, a lower transmission rate is desirable: this means less light is getting to your eye. In low-light conditions, a higher transmission rate is better. sunglass manufacturers categorize their light transmission rates in percentages or numbers: Intense, bright sun: 9 to 12 percent; sunny to variable light conditions: 13 to 30 percent; low-light, hazy, overcast conditions: 31 to 55.

. Sunglass Care, On-the-Go
If you don’t have a proper sunglass cloth on hand, one of the best ways to clean glasses quickly is to breath on them or get them wet with water (not saltwater before wiping them gently with a soft cloth. You should not use paper products (toilet paper, napkin, or paper towel as these are highly abrasive and scratch the lens coating. also, when saltwater dries on a lens, use soap and water and before wiping to avoid scratching the lens surface and coatings. For a more thorough cleaning, you should routinely wash your glasses. Start by cleaning the nose pads and then rinsing the glasses under warm water to remove dirt and surface residue. then, apply a small amount of mild detergent to your clean fingers and gently move the soap across the lenses in a circular motion. Finally, rinse the glasses again under warm water; if they are really clean, the lenses will repel water, so all that you need to do is dry the frames with a soft cotton cloth.

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