[Transmission of the anterior chamber pressure to the center of the vitreous body and to the posterior pole of the eye of the miniature swine. Measurement of isovolumetric and direct pressure].
Experimental variations of the anterior chamber pressure (P.I.C.) are transmitted at about 300 ms to the middle of the vitreous. The response time to a sudden experimental increase in P.I.C. to the centre of the vitreous is variable and depends essentially on the control intra-ocular pressure: the more it is raised the shorter the response time. The pressure in the centre of the vitreous (P.I.V.) has a pulsatile character probably due to transmission of arterial pulsation. The higher the intra-ocular pressure the greater the amplitude of these pulsations. Recording of P.I.V. close to the surface of the retina show abrupt falls despite the fact that the P.I.C. and systemic arterial pressure remain stable. These results are discussed in relationship to autoregulation of the retinal circulation and the physiopathology of glaucoma.
D000818:Animals; D000867:Anterior Chamber / Q000502:physiology*; D007429:Intraocular Pressure; D013552:Swine; D014822:Vitreous Body / Q000502:physiology*
Trasmission de la pression intracamérulaire au centre du cops vitré et au pôle postérieur de l'oeil du porc miniature. Mesures de la pression directe et isovolumétrique