NATURE

slepý jako patrona

1. Your sense of direction is totally lost, you're blind as a bat, and I'm nowhere around to guide you to the lavatory. (COCA)
2. I'm blind as a bat without my glasses. Mind if I wear them? (COCA)
   
3. He was deaf as a post and blind as a bat. (The irony was not lost on the old count.) (COCA)