I see ... sort of ... but I was thinking of the Enchroma glasses and didn't really understand. I do understand the frustration of visual issues, I have ROP and it creates some weird filtering of vision that is somewhat intrusive on my seeing clearly. It's like I have visual noise moving and vibrating in front of my retina constantly causing hot spots (though the size of a pin-point and billions of them floating in my eye. add a few other features and well, be glad I don't have a driver's license.

Boni

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"Be Hero to Yourself" -- Peter Tork