There are real advantages to a good quality pair of polarised sunglasses when enjoying the outdoors.
When it comes to sunglasses many people fall into two categories – those who buy the cheap and cheerful multiple pairs from the petrol station; handy for when you lose them – or those that are into designer brands.
In both cases we do advise you take protection of your eyes seriously, and seek the advice of your local optometrist or dispensing optician when choosing prescription sunglasses.
When sunlight reflects off a horizontal surface like a road or water, the rays become concentrated horizontally, causing glare that enters your eye and interferes with your vision.
Polarised lenses have a built in laminated filter that only lets in vertical light rays and blocks out the horizontal, making them the best option for driving and water sports like fishing.
Polarised lenses allow you to see through water and they reduce glare quite markedly, making them a safer option for summertime driving.
Polarised lenses selectively eliminate the wavelengths of light that cause glare, while non polarised sunglasses absorb all light wavelengths equally.
Non-polarised lenses will reduce the intensity of light but because they don’t take into account the direction of the light, they don’t cut out so much glare.
There are occasions when non-polarised lenses are better though.
Pilots should not use polarised lenses because they can make flight instruments difficult to read and other objects in the sky, including other planes, less visible. Polarised lenses can also make viewing LCD screens more difficult.
Beyond the edge of the blue part of the visible spectrum are the Ultra Violet rays. You can’t see the UV radiation but it carries more energy than visible light rays and can damage the eye over a period of time.
Most good quality sunglass lenses will protect your eyes from UVA and UVB but if you’re not sure whether your sunglass lenses have UV protection you can come into our Lower Hutt or Johsonville practices and we can measure the level of protection under a special UV tester.
Whatever your requirements, our staff can help you with the lenses most suitable for you.