Background: Measuring optic nerve sheath diameter (ONSD), a relatively\nrecent technique, allows an indirect and non-invasive diagnosis of intracranial\nhypertension. The ONSD ratio to eyeball transverse diameter (ETD) increases\nthis reliability of the technique. The objective of this study was to determine\nthe normal ONSD and its ratio with ETD in black African adults in\nBenin. Methods: A descriptive cross-sectional study was conducted between\nMay 2019 and August 2019. Ultrasound ONSD and ONSD/ETD ratio were\nmeasured in 210 healthy adults received in the medical imaging department\nof the Borgou and Alibori University Hospital Center in Benin. The ONSD\ncorresponded to the average of 12 measurements (03 horizontal and 03 vertical\nfor each eye) taken 3 mm behind the papilla. The transverse ETD corresponded\nto the average of 03 measurements...................
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