Ah yes, that's something I should have mentioned actually, as I know it's been contentious point for some users. It's very comfortable, no light leakage and both eyes are 'tact sharp'. It's a 67mm ipd, I was worried this seemed much wider than others reviewer were stating so I had it check at a local opticians they confirmed 66.5mm so I stuck with the original size/order and can't see how it could be improved.