That is one big reason why 34" ultrawide monitors are popular. Unfortunately, the best ones so far are only 163 ppi at 5120x2160. My holy grail would be something like 6208x2619 / 198 ppi, but I'd also take something like 6720x2835 / 215 ppi.
BTW, the top of the viewing area of my 31.5" 6144x3456 monitor with the new aftermarket stand is at about 19.7". The top of the bezel is at 20.1".
The top of the viewing area of my 27" iMac is at about 19.3", so only about 1 cm below the top of the viewing area on my 31.5" 6K monitor. The iMac's bezel is significantly larger though so the top of the iMac is at about 20.3", which actually makes it taller than my 31.5" 6K monitor.
There are other stands that will go even lower, but they generally don't look as nice. This is my aftermarket all aluminum stand. At its lowest setting, as mentioned it pairs really well with the M4 Mac mini. However, at that lowest setting it would be a little too low for comfort for the Mac Studio, since the Mac Studio is significantly taller. I suspect that is one reason why the 32" Apple Pro Display XDR is somewhat taller at 21" - to provide more clearance at the lowest setting for the Mac Studio.
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Are you talking about presbyopia? If so, you can get computer glasses for that, but they do provide a small range of viewing distances. You usually don't need to have an exact distance because even with presbyopia your eyes can still partially focus.