Activation of the heart rhythm during negative compression of the eyeballs in healthy subjects

A phenomenon of oculosympathetic reflex (OSR) has been discovered: the activation of heart rate during an eyeball suction. The OSR seems to be due to either activation of eyeball proprioceptors mediated by the RF and locus coeruleus, or to a baroreflex mechanism originated from the intraocular portion of art. ophthalmica. The OSR and Aschner's reflex seem to trigger some vegetative barometeopathetic responses.