A cartridge for folding an ophthalmic implant including pliers having two articulated arms which are provided with substantially coaxial channels and each of which is boarded by two longitudinal edges. The channels are open in front of each other and define a partially folded conduit containing the implant when the two arms are brought to each other. When the two arms are brought to each other, at least two edges positioned in front of the channels are driven apart transversally with respect to a conduit on a plane. The two arms are jointed in such a way that the arm delimits the supporting shoulder of the implant being projected in front of the channel embodied in the other arm.