While the body, especially the brain, need benzodiazepines to survive (we get them from food), Norita, I am unaware of benzodiazepine compounds such as alprazolam, the active ingredient of Xanax, having a direct effect on bodily functions such as vision at therapeutic doses.
However, benzodiazepine receptors occur in vision and oculomotor control areas of the central nervous system (CNS), so a link between your enhanced vision and Xanax can't be ruled out.
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