Not sure why the "lazy eye/eyes" happen when on H. But it's for sure a dead give-away that one is high (and close to nodding/nodding at that moment) on H or some other kind of opiate, but is usually seen in IV heroin users due to the fact that there aren't any other IV forms of opiates out there that can be IV'd easily ever sense OxyContin started making the OPs, and those roxi's are nasty as hell to IV and don't really work that well. Its basically just a side effect of doing introducing a strong opiate (diacetylmorphine) into the blood stream instantly and therefore enhancing the side effects of opies - like small pupils, half open eyes, that "lazy eye" effect, and passing out in mid conversations and talking about stuff that makes no sense... All signs of someone who is currently VERY high on USUALLY H, but it could be any opie if taken enough of... its just a side effect b/c of the central nervous system depression.