I noticed this while playing around outside the other night with my sanwu 405nm. I recently got a new set of glasses, and I notice that they dramatically weaken the visual strength of a 405nm beam and make it look almost 'grayish'. Taking off my glasses the beam goes back to a familiar violet shade, and is much more visible(Although blurry). I assume this is due to some kind of UV filtering on the glasses which also blocks out 'near uv' wavelengths?
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