I'm completely blind, I have travelled solo and it's great. For instance I got all the way from London to destinations like Tokyo, Los Angeles and New York without having anyone I know with me. You just call up all the places and people you're going to need help from and organise it. I've written up loads of howto stuff on this in the past and you can find that information here:
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As to browsing in shops, yes, that is really hard and something that I wish I could do better. Would I like to be able to see what's going on around me, of course I would, but that is not available. The biggest issue is that it takes a huge amount of planning, which is annoying and time consuming. It feels like a bigger risk than it probably would otherwise. In the end though none of that is going to change any time soon, so it's that or don't do it.