Octopus 123 was used in assessment of very early,early and moderate glaucoma on 60 eyes of 38 patients. This study showed the relationship between the results of Goldmann perimetry(GP) and that of octopus 123 G1X program. The increase of MD and CLV was co-related to the severity of visual field defects in GP. Flat type, seep type and mixed type were found in the Bebie's curve of glaucoma eyes. The flat type suggests relative diffusion of defects. The seep one suggests relatively local and deep defects. The mixed type means deeper and more localed defects within the diffuse defect area. 79% of the very early glaucoma showed the flat type of Bebie's curve in this study and the probable mechanism was disscused.