That was fun! I did it once last night. Got the first four and missed the last two. I was confident in the first three, four was a little tougher but I could hear the difference and the last two I felt like I was guessing. I was really pleased with that since I was listening through cheap $4 mini headphones on my little android tablet in the living room while my husband was watching TV and the noisy a/c in there was on. I was like alright! Maybe the secret is cheap headphones.
I've had mild high freq hearing loss in my right ear since a blow to the side of my head when I was a kid. What bothers me most is when tinnitus flares up in that ear. It's really obnoxious noise to mix through. It's been so bad at times that I seriously thought about quitting music. After lots of googling, I discovered quite a few suffer from it and continue making their music by learning to work around it. So I've learned to get ear rest among other things. At times it's still hard to deal with if I have a nasty flare. It's like the more you focus on it the worse it gets and ignoring it isn't easy. I have to encourage myself to keep on keeping on. And discipline myself to take breaks when I'm mixing something and my ears are tired - easier said that done. The good days are great when it's not there or so low I don't notice it. The bad days suck. I'm still hanging in there.

Maybe someday I'll figure out how to do it by sight.