Method of manufacturing printed optical elements , successively consisting in: o printing, using an inkjet printing technique, a first layer of a transparent liquid substance on elementary surfaces of a printing substrate to form outlines of convex protrusions, so-called cores , o solidifying said cores by any known means, such as cooling drying or polymerisation, o and in subsequently printing, by said inkjet printing technique, at least one additional layer of a liquid substance, wherein each additional layer is solidified by any known means, such as cooling, drying or polymerisation, to form convex protrusions constituting printed optical elements , characterised in that : o the transparent liquid substance used to print the cores on the printing substrate has a surface tension greater than that of the remainder of the surface of the printing substrate , wherein the ink of the first layer is applied to the elementary surfaces in the form of solid print areas, ∘ the surface tension of the liquid substance constituting said at least one additional layer is substantially higher than that of the remainder of the surface of the substrate not covered with cores and is printed on a portion at least of said cores formed on the printing substrate , such that after solidification and depending on the desired shape for said protrusion, part of the additional layer applied to a core occupies a surface of the printing substrate identical or substantially smaller or larger than the core in question , its being specified that the "inkjet printing technique" comprises depositing a liquid substance termed "ink" on a printing substrate in successive strips from an edge of said printing substrate to the opposite edge, in contrast to a printing technique by plotting, which involves moving a deposition device along each of the curves to be plotted on said printing substrate. o printing, using an inkjet printing technique, a first layer of a transparent liquid substance on elementary surfaces of a printing substrate to form outlines of convex protrusions, so-called cores , o solidifying said cores by any known means, such as cooling drying or polymerisation, o and in subsequently printing, by said inkjet printing technique, at least one additional layer of a liquid substance, wherein each additional layer is solidified by any known means, such as cooling, drying or polymerisation, to form convex protrusions constituting printed optical elements , o the transparent liquid substance used to print the cores on the printing substrate has a surface tension greater than that of the remainder of the surface of the printing substrate , wherein the ink of the first layer is applied to the elementary surfaces in the form of solid print areas, ∘ the surface tension of the liquid substance constituting said at least one additional layer is substantially higher than that of the remainder of the surface of the substrate not covered with cores and is printed on a portion at least of said cores formed on the printing substrate , such that after solidification and depending on the desired shape for said protrusion, part of the additional layer applied to a core occupies a surface of the printing substrate identical or substantially smaller or larger than the core in question , <EOS>