18 Dec Facts about polarised sunglasses you should know
We all love to look good, and with summer now here, we need to look at some facts about sunglass selection. When selecting sunglasses or advising on sunglass lens selection, it can’t all be about the look, although many just want that. Sure the frame needs to be cool, after all, it’s fashion that drives our business. But, sunglass lenses cannot be overlooked.
Overused selling point
Polarised or non-polarised lenses. I have heard it many times, the old story of the salesperson selling the customer the virtues of polarised lenses. “Polarised sunglasses are the best”. “Why?” asked the customer. “You can see fish in water” came the reply. “But I don’t want to see fish in water!” responded the frustrated customer. Knowing the benefits of polarised lenses as well as the drawbacks can make sunglass selection and recommendation easy.
What is polarised light all about?
Light from the sun (unpolarised light) becomes polarised when it strikes a reflecting surface such as water, roads or snow, causing reflected or blinding glare. Polarised lenses absorb light from the polarised orientation and transmit light from non-polarised orientation. Besides looking at fish, polarised lenses provide safe, comfortable vision when driving by removing the blinding glare when the sun is low in the sky (Brewster’s angle). Perfect candidates for polarised lenses are Mums and Dads when dropping off and picking up the kids at school around 9.00am and 3.00pm.
The drawbacks of polarised lenses, while few, are quite significant. Pilots will not enjoy looking at fish from their cockpit but more importantly, pilots need to avoid polarised lenses because of the need to constantly look at their flying instruments and navigation aids which all have liquid crystal displays (LCD), based on polarised filters themselves. The pilot’s view of the instruments is compromised when looking from an angle.
(Image from canstock)