Maybe try the Be My Eyes or Aira apps to borrow somebody’s eyes so they can inspect the bread through your phone camera for you. Aira is free for 5 minutes every 48 hours if you choose to use that option rather than the volunteer Be My Eyes, but both should be able to help if you want to make sure there is no visible mould.

Smell it. I find that off bread smells "green" and weird. Sort of a fusty and damp smell...it's hard to describe but very distinctive.

To reduce the chances of it going off, when you buy a loaf, freeze most of it, keeping out enough for a couple of days. Once you use up the small portion, remove the next lot and allow it to defrost. Bread rarely suffers from being frozen.

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Stale bread is stiff, bread with mold is usually damp and the texture may feel different than the rest of the slice. If you can get someone with normal vision to look at it or use one of the services recommended that would be a good idea.

Normally, bread bought five days ago should be fine (I'm not saying you should eat yours.). Are you buying loaves with the latest sell-by date? (With milk, the freshest milk is put at the back of the shelf, which may also be true of bread.) Are you refrigerating it? Are taking care to seal it securely so as little air gets in as possible?

This is the same reason I have so many reusable water bottles. Because I put something like juice in them then drink it but you know there’s still residue left in it but I forget about it and just leave the bottle on my floor or desk. Mostly because I’m lazy in the moment and don’t feel like cleaning it then I don’t remember for weeks.

But then like I clean them and leave them to soak but idk if it’s still dirty and it’s not like a regular dish where I can really scrub the entire thing good. So idk if there’s something nasty in there and one time I filled one up with water afterwards and took a sip and it tasted off.

So yea I have like 15 bottles and only use a few of them still. Which is super wasteful but I can’t drink nasty water.

Bro, even a sighted person knows when bread is spoiled when they're not looking at it.

Trust me, bad bread smells horrific. You'll know.

Also, like another commenter said, just stick it in the freezer when you're not using it. I started doing this during college, not because of bad eyesight, but because of paranoia that it'll go bad and I'll have to go back to the store and... buy more.