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To explore the application value of ultrasonic measurement of optic nerve sheath diameter in elderly patients with craniocerebral injury. 86 cases of elderly patients with craniocerebral injury treated in our hospital between January 2017 and December 2018 were included, all of whom had the invasive monitoring of intracranial pressure (ICP) and optic nerve sheath diameter (ONSD) in ultrasonic testing. According to ICP measurement results, patients were divided into a normal ICP group (n = 44) and an increased ICP group (ICP ≥ 20 mmHg sto