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I'm not sure if increased daylight sensitivity automatically means better night vision. St John's Wort is available from health food shops as dry herb you can cook up into a tea and it certainly increases light sensitivity (both for eyes and for skin) but I'm not sure about night vision. It never occurred to me to try. (You can also get it pill form but a properly brewed tea will have more of an immediate effect.) There are other herbs and drugs that are known to increase light sensitivity in daylight.
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