Introduction: Researchers led the cross-sectional and observational examination to verify their legitimacy, its ideal boundary and its ability to change between observers in our ICU cases. The Optic Nerve Sheath Diameter through using visual ultrasound is gradually being used today as the non-invasive method to recognize high intracranial weight. Methods: Standards for avoidance were: unexpected breathing, proximity to hyperthyroidism, optic nerve cancer, neuritis, glaucoma, and orbital rupture. Adult cases admitted to the ICU throughout the 6-month interim period (November 2017-April 2018) were selected for survey. Cases remained separated into 2sets. Set I - those who had expanded ICP clinically or based on radiological findings. Gang II - cases with not any evidence of increased PIC. A direct test with a recurrence of 14-8 MHz, Sonosite TM USA, was used to quantify NDON by two experienced, blinded examiners. The average of three readings was taken. All information remained accumulated and decomposed by applying the suitable measurable trials. Results: Out of 124 selected cases, 110 accomplished investigation; 68 in Set I and 38 in Set II. The mean NDON in two groups was 0.63 ± 0.08 cm versus 0.477 ± 0.044 (p < 0.002); and 0.63 ± 0.08 versus 0.48 ± 0.043 (p < 0.002) justified and the left eye separately. Fluctuation between viewers was non-significant, affectability was 88.46%, explicitly 95.56%, positive preciousness value 96.84%, negative preciousness value 83.86% where 6.0 mm was taken as the cut-off. Conclusion: Bedside ONSD estimated through ultrasound is the decent screening device to distinguish high intracranial weight in intrusively ventilated ICU cases. Key words: Ultrasound; Intracranial pressure; Monitoring; Optic nerve sheath diameter; Noninvasive method.