Optical device adapted for a wearer comprising: - a frame, - an optical system with an active function configured to be mounted into the frame, - a first wafer comprising an internal face facing the optical system, the first wafer being configured to be mounted into the frame, and - a holding mean configured to maintain the optical system and the wafer in the frame without contact at least between a part of the optical system and the internal face of the first wafer, the holding mean comprises a first block being embedded in the frame and a second block, the first block comprising a rim having a first holding geometry and a second holding geometries, being groves (252, 254) configured to maintain respectively the external periphery of the optical system and the external periphery of a second wafer, being a front wafer, the external peripheries of the optical system and front wafer have respectively a corresponding complementary holding geometry, being a corresponding bevel, configured to cooperate respectively with the two grooves (252, 254), the second block comprising a rim having one holding geometry, a back groove configured to maintain the external periphery of a back wafer, the back wafer being the first wafer, the external periphery of the first wafer has respectively a corresponding complementary holding geometry, being a corresponding bevel, configured to cooperate respectively with the back groove,wherein the holding mean comprises an elastic ring, being an elastomer sealing means, arranged between the first block and the other block, wherein the elastic ring is arranged between a peripheral area of the first wafer and a peripheral area of the optical system, the width of the elastic ring being configured to ensure a gap at least between the part of the optical system and the first wafer, wherein the sealing means ensuring water and/or air tightness of the gap of the optical device, and wherein the holding mean comprises a screw arranged and configured to assemble blocks (241, 246) and the elastic ring by screwing through the blocks (241, 246) and the elastic ring. - a frame, - an optical system with an active function configured to be mounted into the frame, - a first wafer comprising an internal face facing the optical system, the first wafer being configured to be mounted into the frame, and - a holding mean configured to maintain the optical system and the wafer in the frame without contact at least between a part of the optical system and the internal face of the first wafer, the holding mean comprises a first block being embedded in the frame and a second block, the first block comprising a rim having a first holding geometry and a second holding geometries, being groves (252, 254) configured to maintain respectively the external periphery of the optical system and the external periphery of a second wafer, being a front wafer, the external peripheries of the optical system and front wafer have respectively a corresponding complementary holding geometry, being a corresponding bevel, configured to cooperate respectively with the two grooves (252, 254), the second block comprising a rim having one holding geometry, a back groove configured to maintain the external periphery of a back wafer, the back wafer being the first wafer, the external periphery of the first wafer has respectively a corresponding complementary holding geometry, being a corresponding bevel, configured to cooperate respectively with the back groove,wherein the holding mean comprises an elastic ring, being an elastomer sealing means, arranged between the first block and the other block, wherein the elastic ring is arranged between a peripheral area of the first wafer and a peripheral area of the optical system, the width of the elastic ring being configured to ensure a gap at least between the part of the optical system and the first wafer, wherein the sealing means ensuring water and/or air tightness of the gap of the optical device, and wherein the holding mean comprises a screw arranged and configured to assemble blocks (241, 246) and the elastic ring by screwing through the blocks (241, 246) and the elastic ring.