It will be appreciated that by zero power or plano, it is meant that the optics provide {TAIL ~ no substantial visually discernable correction} to {HEAD ~ the human eye} 
It will be appreciated that by zero power or plano , it is meant that the optics provide { TAIL ~ no substantial visually discernable correction } to { HEAD ~ the human eye }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD