Analysis of relationship among visual evoked potential, oscillatory potential and visual acuity under stimulated weightlessness

Abstract:

AIM: To observe the influence of head-down tilt simulated weightlessness on visual evoked potential(VEP), oscillatory potentials(OPs)and visual acuity, and analyse the relationship among them.

METHODS: Head-down tilt for -6° was adopted in 14 healthy volunteers. Distant visual acuity, near visual acuity, VEP and OPs were recorded before, two days and five days after trial. The record procedure of OPs followed the ISCEV standard for full-field clinical electroretinography(2008 update).

RESULTS: Significant differences were detected in the amplitude of P₁₀₀ waves and ∑OPs among various time points(P<0.05). But no relationship was observed among VEP, OPs and visual acuity.

CONCLUSION: Head-down tilt simulated weightlessness induce the rearrange of blood of the whole body including eyes, which can make the change of visual electrophysiology but not visual acuity.