Transparent electrochromic system, allowing clear vision through said system, forming a glazing, an aircraft window, an ophthalmic spectacle lens, a helmet visor, a mask lens, or a pellet intended to be applied to an ophthalmic lens, a helmet visor or a mask lens, and comprising: - two parallel outer walls (10, 11), the system being transparent for a viewing direction passing through through the outer walls between two opposite sides; - a network of internal walls placed between the two outer walls, said internal walls extending perpendicularly to said outer walls and defining a set of cells juxtaposed in parallel to said outer walls; - portions of liquid and/or gel contained respectively in the cells; - first and second electroactive substances distributed in the portions of liquid and/or gel, with respective electrical redox potentials that are different, at least some of the first and second electroactive substances having a variable optical effect between an oxidized form and a reduced form of said substances; - two transparent power supply electrodes (1, 2) carried together by a single one of the two outer walls, and intended to be connected respectively to two power supply terminals of a variable electrical power supply unit (20, 21), each of said power supply electrodes being in direct electrical contact with the portions of liquid and/or gel contained in at least some of the cells for transferring electrons to or from at least some of the electroactive substances, in an inverse fashion between said first and second electroactive substances at a given time; characterized in that the system further comprises at least one additional transparent electrode without direct electrical contact with said power supply electrodes (1, 2) inside the electrochromic system, said additional electrode being parallel to said power supply electrodes inside at least some of the cells, and the system further comprises, for at least some of the cells, an electrically insulating film placed between the additional electrode and the portion of liquid and/or gel contained in each of said cells, so as to prevent contact between said portion of liquid and/or gel and the additional electrode. - two parallel outer walls (10, 11), the system being transparent for a viewing direction passing through through the outer walls between two opposite sides; - a network of internal walls placed between the two outer walls, said internal walls extending perpendicularly to said outer walls and defining a set of cells juxtaposed in parallel to said outer walls; - portions of liquid and/or gel contained respectively in the cells; - first and second electroactive substances distributed in the portions of liquid and/or gel, with respective electrical redox potentials that are different, at least some of the first and second electroactive substances having a variable optical effect between an oxidized form and a reduced form of said substances; - two transparent power supply electrodes (1, 2) carried together by a single one of the two outer walls, and intended to be connected respectively to two power supply terminals of a variable electrical power supply unit (20, 21), each of said power supply electrodes being in direct electrical contact with the portions of liquid and/or gel contained in at least some of the cells for transferring electrons to or from at least some of the electroactive substances, in an inverse fashion between said first and second electroactive substances at a given time;