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Message: <blockquote data-quote="OPTIC_NUT" data-source="post: 3285762" data-attributes="member: 121951">I was making sure the eyeglass wearer actually kept them on.  ;-)I am shortsighted as well   (negative lens correction, to answer someone    else's question).   That is the type of eye usually bothered by the   blackout issue.  There is an explosion of spherical aberration before   and even after the ideal spot.  Of course, the glasses should be taming    that.   I don't think there is one 'intended distance' for the spectacles,unfortunately.   It would take a whopp-ng stack of O-rings to getto one of the positions on the Meoptas.  It's OK, though:  theirclick-stops are satisfactory.It's true that the fov gets reduced at some point.It should be beyond the point where the blackouts clear up, though,shouldn't it?  If not, this is a bad design or defect.To see if there is distance that is ideal....and stable as well,  I sometimes put the binoculars onto a tripod or a plank  T-nutted onto a tripod, and move my eyes around, making sure   the IPD is set right.   There should be a generous zone, but it   may be pretty far out.--------------"Assuming that you are an eyeglass wearer, why would you pull out the eyecups nearly all the way? Sorry but I don't understand."-------------------I would do that if the design called for it.   Actually, I have to pull the Meoptas 2/3 out.They do give me the promised field width at that point, though.You can't really conflate more normal always-clear fields with those on sensitive, unstable eyepieces.Most binoculars show the image clearly at any distance, and the eye relief is defined as where you see the whole FOV.This is not true for 'forced-relief' type eyepieces.</blockquote>

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