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Prescription sunglasses mean you do not need to chang glasses continually depending on the light and conditions. With varifocals glasses set into prescription lenses you can read, travel, sunbathe and drive without the need for changing glasses – as long as you don’t do them all at the same time.
Another advantage of prescription sunglasses is by the pool in summer. It can get pretty boring just sitting there catching some rays and topping up your tango tan so many people choose to read. If you’re wearing your reading glasses and magnifying sunlight towards you, particularly that which bounces off the water, you end up with some serious crow’s feet from squinting. If you wear presciption sunglasses, everything is OK then.