That's correct there's no standard way to measure it. Both scopes are the same but one cost 1/3 of what the other does.
Once again your claims are ludicrous.
First you claim you know better than the manufacturers what the eye relief is on their scopes, but you refuse to mention the specific models you are talking about or ***your*** claimed eye relief for those models. It is a pattern familiar for you – make a claim but provide absolutely no data to back it up.
As to one of the scopes costing “1/3 of what the other does”, you are wrong again. Although you intentionally neglect to mention which specific scopes you are comparing, let’s just take a look at reality and compare the models from both Leupold and Nikon that offer about 5” of eye relief. All prices are from
www.swfa.com:
Leupold
Rifleman Shotgun/Muzzleloader 2-7x, 4.9” relief, $189.95 (75 yard parallax)
Rifleman Shotgun/Muzzleloader 3-9x40mm, 4.9” relief, $199.95 (75 yard parallax)
VX-1 Shotgun/Muzzleloader 2-7x33mm, 4.9” relief, $209.95 (75 yard parallax)
VX-II 2-7x33mm, 4.9” relief, $299.95 (150 yard parallax)
Nikon
SlugHunter 1.65-5x36mm, 5” relief, $229.95 (75 yard parallax)
Omega Muzzleloader 1.65-5x36mm, 5” relief, $229.95 (100 yard parallax)
Omega Muzzleloader 3-9x40mm, 5” relief, $259.95 (100 yard parallax)
The short and long of it is that if you want a real rifle scope with ~5” eye relief and a parallax setting matched to the capabilities of a Marlin .45-80, the only real option is the Leupold VX-II 2-7x.
In any case, none of the scopes above are anywhere near 1/3 the cost of the others and the very serviceable Leupold Rifleman shotgun scopes are the least expensive of the bunch.
Do you EVER fact check anything you claim?