My wife is an Optometrist and I asked her. She said that tinted lenses are addictive for everyone and that the pupils are used to having less light so therefore they open up trying to allow more light into your eyes to see better. The reason why you're blinded after short exposure to the sun is that your pupils are conditioned to the sunglasses now. She said to try 'weening' off wearing sunglasses all the time or trying a brown tint lense instead. This may take quite some time and it may not improve things.
Good luck!
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