There were a few problems I encountered through my search. One was finding long eye relief eyepieces in the smaller 23.2mm size. I was finding that the 30mm size is more common but my microscope uses 23.2mm eyepieces. The other really big problem was that I wanted the largest top eye lens possible. Far too many microscope eyepieces have a very small top eye lens. Being that my eye is placed away from the eyepiece because of my eyeglasses, I really needed a larger top eye lens for both comfort as well as for seeing the whole field. This proved to be very difficult to find.
I came close to purchasing a couple of used Olympus eyepieces. I don't like buying things used though so I was hesitant. Also, I need two of the exact same eyepieces and was having trouble finding exact pairs. I kept the Olympus eyepieces I found in a saved list in case I decided to go that route though.
I ended up finding these... 10x 22mm eyepieces... and they were exactly what I was hoping to find. As I said, I didn't stumble upon these until about year into my search. These eyepieces (I purchased two of them for my binocular compound microscope) are very comfortable to use for me so that was a success.
I had already upgraded my objectives to PLAN objectives. The objective upgrade was the most significant as far as image quality. My views are now sharp to the edge. This eyepiece upgrade made viewing far more comfortable too. Oh yeah... plus, these provide a wider view than my previous 18mm kit eyepieces. That was noticeable too. Comfort was really my primary concern. Next was a big top eye lens and a wider view. I got all of that with these new eyepieces.
I rarely use more power or need more power than the 10x eyepieces provide but I did some searching for eyepieces in the 15-20x range with the same characteristics... long eye relief and a big top eye lens... and in the 23.2mm size. I had no luck in finding that. It seems like the more powerful eyepieces get smaller and smaller in eye relief as well as the top eye lens.