highly significantP < 0.001
Many authors define the cutoff value of the normal ONSD as (5 mm) which supports our cutoff point gained from the control group to compare it with the corresponding values of the patients.[ 9 13 ] The current study found a highly significant statistical correlation between ONSD with direct measurement of ICP ( R = 0.933 and P < 0.001), this result goes with the latest studies done in Rome, Italy, that was performed in 2017 by Toscano et al. whose found a strong correlation between ONSD and ICP ( R = 0.895 and P < 0.001).[ 14 ] Another