For those rare sites where DarkReader doesn’t do much, I turn it off and turn on HackerVision. It has its own quirks, but between the two I’m in the dark at all times.
Could you use a sky-blue / aqua grey tint to get more bright blue light during the day, or does that make it more difficult clarity wise?
I worry about wearing sunglasses all the time, the theory is that your eyes will lose the ability to handle high-brightness.
Has this been a problem all your life, or did it start later, and, did you start wearing sunglasses regularly before this was an issue?
Also what is the tint on them, is it pure grey, amber (slightly yellowish)-brown, and approximately how much brightness would you guess it takes out? Have you considered a lighter shade to allow more light, and try re-adapting your eyes to slightly brighter light during the day?
If you are unaware, look into the human, or rather mammal circadian rhythm which our body has, and it works primarily on lighting cues.