Vision was one of the last senses to evolve in animals. And yet it's the most useful sense, significantly reducing our reliance on other senses. As a result, if I were to lose my vision, I might well be at a much larger disadvantage than if I'd never been able to see in the first place.
Instead of intentionally walking around blindfolded in preparation for a loss of vision that will hopefully never occur, I could thank my lucky stars that my eyes work and focus on using them to the fullest.