I have some high quality sunglasses - Maui Jim and Adidas - which have great coatings that actually sharpen vision, don't just make everything duller. My understanding is that they work by cutting out some of the light wavelengths that don't focus quite on the retina. Subjectively they definitely enhance vision, and it's a disappointment to take them off - the world seems just a bit less sharp and colourful!
Are there any photographic filters that have the same properties?
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