You can't actually cure the blind status once you get it. However, you can avoid it by not attacking the sandbag that inflicts it, or you can equip the Bat to offset the 200% accuracy reduction caused by the blind effect
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actually no, there item that can cure anything in game and I cure my blind status, I like the game and don`t found all bosses, so I think to play it again . If I found how it called, I write here, but there is a way to cure it, unfortunatly there no wayy to destroy that sand bag, so anyway right now there no use to activate it. Just throw everything you have at her torso better variant)