The patients fulfilled a series of inclusion criteria including the measurements of IOP ( 22-29 mmHg ) , two normal and reliable visual fields ( VFs ) ( on the basis of mean defect and corrected pattern standard deviation/corrected loss of variance of standard 30/II Humphrey or Octopus perimetry ) , and normal optic disc as determined by the Optic Disc Reading Center ( vertical and horizontal cup-to-disc ratios ; asymmetry between the two eyes < or = 0.4 ) .
