Ethanol consumption impairs vestibulo-ocular reflex function measured by the video head impulse test and dynamic...

Area of Science:

• Neuroscience
• Ophthalmology
• Vestibular System

Background:

• Ethanol is known to affect the central and peripheral nervous systems.
• Previous research indicates ethanol's impact on vestibular and oculomotor functions.

Purpose of the Study:

• To investigate the effects of ethanol on the vestibulo-ocular reflex (VOR) using novel testing methods.
• To assess ethanol's impact on dynamic visual acuity (DVA) and static visual acuity (SVA).

Main Methods:

• Eight healthy subjects were tested after consuming standardized ethanol doses.
• A repeated measures design tracked vestibular function up to a breath alcohol concentration (BrAC) of 1.38 per mil.
• Tests included the video head impulse test (vHIT) and dynamic visual acuity (DVA).

Main Results:

• VOR gain, measured by vHIT, decreased by 25% at the highest BrAC.
• Catch-up saccades increased in number and size with rising BrAC.
• DVA scores increased by 86%, indicating deteriorated acuity, while SVA remained unchanged.

Conclusions:

• Ethanol consumption systematically impairs the VOR during high-acceleration head impulses.
• Alcohol intake leads to a functional loss of visual acuity during head movements.
• Novel VOR tests effectively quantify ethanol's detrimental effects on vestibular and visual function.