bitflipper
Brian Wilson's an interesting case. As most know, he was almost completely deaf in one ear, and yet is widely regarded as one of the best mix engineers of all time. 

i've never considered him a 'mix engineer'
 
maybe a producer,
certainly a brilliant writer,
but i don't see how you could ever excel in stereo mixes with only one ear.
then it's mono.
 

mettelus
There are multiple copies of "The Art of Mixing" on YouTube, the entire video is 2hrs 40mins but some have also sliced it up into sections. The visual effects are rather entertaining due to the era it was made in, but the concepts still apply.

I watched the whole thing a couple of years ago. Quirky and entertaining but probably could have condensed the info in it into less than an hour. I suspect the book is better. 

Leadfoot
I have a little hearing damage. Mine is more of a problem of each ear has different frequency deficiencies. My left ear doesn't hear low frequencies as well as my right ear. My right ear doesn't hear higher frequencies as well as my left ear. I don't know whether my ear canals are shaped differently, or if it's damage from years of playing in bands. I use some of the same techniques as you. I also use frequency analyzers (not Sonar's) to see if what I'm hearing is being visually represented on the analyzer. I also solo the left and right channels, and listen with each ear facing each monitor individually. I also listen to the mix in mono. That's about all I can think of at the moment. I'll chime back in if I think of anything else.

 
I have the same thing and I don't know if it's hearing damage (I blasted my ear drums for a lot of years) or just natural quirks. For instance, my eyes see slightly different colors. I have one ear that hears bass better, and another which hears treble better. I think the most important thing with any audio deficiency whether it be your ears or the room, is to use reference material constantly. 
 
My biggest problem is tinnitus. Almost everyone I know of my age (early 40's) has it to some degree. We screwed our ears from playing in bands, clubbing and raving. I have very high frequency hissing that's extremely noticeable when listening to quiet passages of music. It's kind of a bummer but I'm fine with it at this point, totally used to it. 

Thanks to everyone.  Your input is not taken lightly. 
 
May you all hear FOREVER.
 
Sure do miss stereo though.
 
Jesse Q

I'm 62. At age 50 I lost nearly all hearing in my left ear (I'm at ~35%, all high freqs cut through, no lows). My right ear is at ~70% mostly low freq almost no highs. In most mono headphone tests I can't hear past 6KHz. If I had to rely solely on my right ear I'm pretty sure about 3KHz would be my cutoff.
 
As my pal bit says; it's only going to get worse over time. I'm hoping to hear of some magical implants in the next 5 years. As the Beach Boys sang.... Wouldn't It Be Nice.

Be sure to check out the H.E.A.R. booth at NAMM (that's Pete Townshend's deaf-rocker support group). Assuming they'll be there again this year, handing out earplugs.
 
In past years there have been free hearing tests at NAMM, provided by some local audiologists. I didn't get one, as the line was TOO LONG. I suspect more than a few NAMM attendees are hearing impaired, if not beforehand than certainly afterward.

Can you PLEASSSSE speak up bit, I cannae hear you.

I SAID, MOST OF US HERE ARE HEARING-IMPAIRED, WHETHER WE KNOW IT OR NOT

lol

I'm frightened to wear cans when someone else is in charge of the sound source, ever since I read about what happened to Andy Partridge of XTC. He was listening to a track at full volume to check for noise when some doofus in the studio triggered a snare sample through his cans. Permanent raging tinnitus ever since. Apparently he spent months sitting every morning in a hyperbaric oxygen chamber to reduce the noise (which apparently works to some extent). But it just goes to show you how easily you can screw your ears through being careless. 
 
Of course the other example of how quickly you can do it exists on film - Pete Townsend standing next to Keith Moon's exploding drum kit on The Smothers Brothers Comedy Hour.