Using an experimental mouse model of retinal detachment, we (i) confirm morpho-functional alterations in reactive Müller glial cells including a mislocation of Kir4.1 potassium channels and a downregulation of AQP4 water channels, accompanied by disturbed volume regulation of the cells; (ii) show a fast and strong decrease of the dystrophin protein, Dp71; and finally (iii) demonstrate an impaired BRB function as evidenced by increased retinal vascular permeability. Here, KCNA3 is linked to retinal detachment.