I’m not sure but it seems that those glasses are optimized for viewing further than directly in front of the eye. Is that possible? It seems like you might have some expertise to share. If that’s the case what would you recommend?
I don't have medical training. Years ago, I copy-edited the journal of a national association of optometrists for a while and picked up some of the vocabulary and concepts, that's all.
Reading glasses, whether mass-produced or manufactured to the patient's prescription, bring the focal plane closer to your eyes. You need stronger ones as the decades pass and your natural minimum focal distance goes farther out. There's a trade-off that becomes more evident over time: the stronger the reading lens, the thinner the field of acceptable sharpness.
It's possible to need, or at least to benefit from, slightly different amounts of correction for the two eyes.
You choose a strength of reading lens that optimizes the clarity of print at your habitual reading distance. People look into viewfinders at such a close distance that I wouldn't think there'd be any reading glasses strong enough. An optometrist might be able to prescribe a custom lens with the needed extreme correction. Another option is a magnifying lens.