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Introduction: Transorbital sonography is a reliable method for evaluation of the size of the optic nerve diameter (OND) and the optic nerve sheath (ONSD) which may be useful in the noninvasive evaluation of patients with elevated intracranial pressure. Wide ranges of regular ONSD values have been reported in the literature. The aim of this study is to establish values of OND and ONSD in a healthy population, also, if there are differences between OND and ONSD considering gender, age, BMI, and the correlation of testing within and between examiners. Methods: One hundred healthy subjects (without intracranial pathology), aged between 22 - 87 years, were included. Each subject underwent transbulbar sonography, on each eye each examiner measured OND and ONSD on two occasions at a depth of 3 mm behind the papilla of the optic nerve. Results: Measurement and analysis of OND and ONSD values were possible in all 100 subjects. There was a statistically significant difference between OND values in men and women (p = 0, 42), but there was no statistically significant difference between ONSD values between the sexes. Also, results showed that there was not statistically significant correlation between the age of the subjects and the values of OND and ONSD (p> 0.01), while a statistically significant difference was found in the values of OND, considering the BMI, but not in the values of ONSD. Pearson’s coefficient showed a positive correlation within and between examiner measurements (p |
