My guess as to why Tsubaki doesn't get glasses is because the cult wants to preserve her "image" of being an oracle of some sort. Her poor eyesight was suppose to be a sign of her having special powers (or so they claim), so trying to correct it would be seen as suppressing her gift.
It's sort of like how in some cultures (like the traditional Hmong), people who suffered epileptic seizures were thought to have gone into spiritual trances, and thus were qualified to be the village shaman or something.
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