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Message: <blockquote data-quote="Vespobuteo" data-source="post: 3326644" data-attributes="member: 120830">I mean the effective eye relief when wearing eye glasses with the eye cups in the lowest position.The eye cup design/depth will affect how close you can get with your glasses to the ocular glass and thus how much of the stated ER that is usable.(stated ER seem to be measured from the ocular glass)My FL:s have 16 mm ER and the SV:s 20 mm but eye cup designs are so different so they both work pretty much same with glasses.For the ATX scopes there is a special eye cup for eye glass wearers that gives a bit more usable/effective ER. IMO that would be a good idea for the SV:s also.</blockquote>