The ONSD, transcranial Doppler parameters and baseline data of the normal intracranial pressure group and the enhanced intracranial pressure group (more than 200 mmH2O) .
This study aims to adopt a multi-center large sample size study to define (1) the normal range of Chinese ONSD; (2) ONSD diagnosis for patients with high intracranial pressure; (3) to analyze the correlation between ONSD and intracranial pressure.