LAUSR

For their study, the authors utilized B-mode echography to measure ONSD. Although we are aware that this is a widespread practice, especially in the Emergency Department, unluckily this ultrasound technique should be considered quite untrustworthy for this aim, due to the blooming effect [2]. For more than 50 years, B scan has been employed to detect several ocular and orbital diseases, but for measurements of small structures, such as ONSD, it has been proven to be quite unreliable because of this effect. Indeed, the lack of a standard gain setting in performing this examination produces blooming effect, meaning that, decreasing the gain, the ONSD will appear larger.