Living in Australia, we are subjected to glare and ultraviolet light on an almost constant basis. The harmful effects of ultraviolet light are well-known and include an increased risk of cataracts, macular degeneration, ocular surface disease such as pterygium, and dry eye. It also increases the risk of developing cancers on the eye surface.
Obviously the way to reduce your risk is to wear sunglasses. However what about glare and flare reflecting off surfaces? Normal tinted lenses and sunglasses will reduce the general amount of visible light and ultraviolet light that enters your eye. Only polarised lenses will specifically reduce the amount of reflected light. This is a particularly important in cases such as fishing and boating where there is a lot of light reflected off the water's surface.
Polarised lenses rely on a polarising filter in the lens which cuts out a large proportion of the polarised reflected light. The one disadvantage of polarised sunglasses is that you see stress patterns in glass such as windscreens, however this is minor and generally does not disturb people.
Polarised sunglasses are available in prescription and non-prescription forms.
Prescription polarised sunglasses are available in single vision, bifocals and multifocal glasses. The most effective polarised sunglasses are permanently tinted and do not change colour. You will require one clear pair for inside and night-time driving and the polarised pair for use outside.
So if you do activities that involve a lot of reflected light such as boating, fishing, surfing or snow skiing then come in and ask for polarised lenses and your eyes will thank you for it.