On my third. As others have said, they have to be very accurately dispensed, in terms of pupil height and inter-pupil distance etc. Not all lenses are created equal! My experience is: Pentax - OK (just), Zeiss - rubbish, Kodak - the best so far. Fortunately, you are normally able to reject them up to 30 days and if you're not happy with them by then, you should.
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