How to Choose Good Sunglasses

There's more to choosing sunglasses than how good they look on you. Your sunglasses should keep harmful sun rays away from your eyes.

   Apart from UV, brightness is an issue. What people don't realise is that going from inside to outside involves confronting light thousands of times brighter than what has entered the eye the moment before. Brightness is a comfort issue -- it's uncomfortable to go into the sun from the shade and to have undimmed light flowing into your eyes.

   
 So the darker the lens in your sunglasses the better? Clear glass transmits 90% of light. As the glasses get darker, less and less light penetrates.

  

What colour?

The overall best colour is grey , which absorbs light across the spectrum equally.
Around 8% of men but far fewer women have colour deficiencies (or colour blindness). Depending on your deficiency, you need to select a certain tint of sunglasses.
   
       

             "Bronze is not good for men with a green deficiency. Green is not good for anyone with a red or green deficiency. Grey is safest for men. Women should choose grey, green, or brown.
Rose-tinted glasses. Are they a good way to see the world? "Pink isn't a good colour for anyone to get.


  
              Glass is adequate at blocking UV, but polychromic sunglasses -- glass lenses that get darker as you encounter brightness -- are the gold standard. "Those really work, but glass sunglasses are heavy, despite being long-lasting. "I had a patient today, Glass doesn't scratch as easily as plastic.
  
           What about driving? Sunglasses can cut glare, but never wear them at night. The Highway Code states that you should never wear sunglasses or tinted lenses for driving at night, or when visibility is poor; for example, if it is raining heavily, snowing or foggy.