Y Han1, G Lennerstrand. 1. Department of Ophthalmology, Karolinska Institute, Huddinge University Hospital, Stockholm, Sweden.
Abstract
PURPOSE: The dynamics of accommodative vergence responses were studied to accommodative stimuli combined with the activation of neck muscle proprioception. METHODS: Accommodative stimulation was done with a LED bar. The stimuli were presented monocularly in a stepwise and a sinusoidal mode to either the dominant or the non-dominant eye with the other eye covered. The neck proprioceptors were activated by vibration on the neck muscles which turn the head horizontally. Eye movements were recorded with an infra-red reflection system in both eyes. RESULTS: Vibration of the neck muscles shortened the time constant of the accommodative vergence movement in the covered eye to square wave stimulation when the non-dominant eye was fixating the targets. The gain factor to sine wave stimulation was higher when the non-dominant eye was fixating. CONCLUSION: Extraretinal signals from neck proprioception influenced not only the static eye position, but also the dynamics of monocularly driven accommodative vergence movements, when the non-dominant eye was the viewing eye.
PURPOSE: The dynamics of accommodative vergence responses were studied to accommodative stimuli combined with the activation of neck muscle proprioception. METHODS: Accommodative stimulation was done with a LED bar. The stimuli were presented monocularly in a stepwise and a sinusoidal mode to either the dominant or the non-dominant eye with the other eye covered. The neck proprioceptors were activated by vibration on the neck muscles which turn the head horizontally. Eye movements were recorded with an infra-red reflection system in both eyes. RESULTS: Vibration of the neck muscles shortened the time constant of the accommodative vergence movement in the covered eye to square wave stimulation when the non-dominant eye was fixating the targets. The gain factor to sine wave stimulation was higher when the non-dominant eye was fixating. CONCLUSION: Extraretinal signals from neck proprioception influenced not only the static eye position, but also the dynamics of monocularly driven accommodative vergence movements, when the non-dominant eye was the viewing eye.
Authors: Randi Mork; Helle K Falkenberg; Knut Inge Fostervold; Hanne Mari S Thorud Journal: Int Arch Occup Environ Health Date: 2018-05-30 Impact factor: 3.015
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