I say it's obvious because neither Glass nor Spectacles were wearable by people who need corrective lenses AS corrective eyewear.
This reminds me of Canon vs Nikon. Fanboys on the Internet wank on about megapixels and whatnot but the real differentiator is the eyepoint of the viewfinder, which is probably literally as simple as, the eyepoint guy at Nikon wears glasses themselves and their counterpart at Canon doesn't.
Is there a large difference in viewfinder design nowadays? I wear glasses and use a Canon 1DX2 and have tried out a Nikon D5 — if anything the Canon is more comfortable for me to look through.
The specifications bear me out: Nikon has a 0.71x magnification VF with a 17mm eyepoint, while Canon has a 0.76x magnification VF wish 20mm eyepoint.
My experience of this is back in the day when it was a real eye opener if you'll forgive the pun when I switched to a Nikon F5 from a Canon EOS 3. I expect both companies have different viewfinder designers now, but it just goes to show how a simple usability test can be overlooked.
This reminds me of Canon vs Nikon. Fanboys on the Internet wank on about megapixels and whatnot but the real differentiator is the eyepoint of the viewfinder, which is probably literally as simple as, the eyepoint guy at Nikon wears glasses themselves and their counterpart at Canon doesn't.