An optical article comprising a substrate and on at least one face of the substrate a multilayered antireflecting coating functioning in an interferential manner having antifog properties, said antireflecting coating including a last layer with a refractive index n ≤ 1.55 and a physical thickness of 120 nm or less directly deposited on a high refractive index layer (HI layer) having a refractive index n > 1.55, and a thickness of less than 500 nm, wherein: - the last layer comprises a layer-by-layer (LbL) coating exposed to environment, - the LbL coating consists in at least two bilayers, each bilayer being formed by successively (a) applying a first layer composition comprising at least one compound A having a first electrical charge; (b) applying a second layer composition directly on the first layer resulting from step (a), said second layer composition comprising at least one compound B having a second electric charge which is opposite to said first electric charge, said compounds A and B being independently chosen from superabsorbent polyelectrolytes, colloid of nanoparticles of metal oxide or silicon oxide, or mixtures thereof, said nanoparticles comprising ionic groups and said compounds A and B being functionalized by either -NH 2 or -COOH functional groups, with the first proviso that at least one of compounds A or B is a superabsorbent polyelectrolyte, and with the second proviso that the layers of the antireflecting coating other than the last layer do not comprise any bilayer formed from compositions having opposite electrical charges, and - the LbL coating is crosslinked with a coupling agent, such as carbodiimide coupling reagents, inducing chemical linkages between said NH 2 and COOH groups and has a refractive index at 643 nm ranging from 1.40 to 1.50 - the last layer comprises a layer-by-layer (LbL) coating exposed to environment, - the LbL coating consists in at least two bilayers, each bilayer being formed by successively (a) applying a first layer composition comprising at least one compound A having a first electrical charge; (b) applying a second layer composition directly on the first layer resulting from step (a), said second layer composition comprising at least one compound B having a second electric charge which is opposite to said first electric charge, said compounds A and B being independently chosen from superabsorbent polyelectrolytes, colloid of nanoparticles of metal oxide or silicon oxide, or mixtures thereof, said nanoparticles comprising ionic groups and said compounds A and B being functionalized by either -NH 2 or -COOH functional groups, with the first proviso that at least one of compounds A or B is a superabsorbent polyelectrolyte, and with the second proviso that the layers of the antireflecting coating other than the last layer do not comprise any bilayer formed from compositions having opposite electrical charges, and (a) applying a first layer composition comprising at least one compound A having a first electrical charge; (b) applying a second layer composition directly on the first layer resulting from step (a), said second layer composition comprising at least one compound B having a second electric charge which is opposite to said first electric charge, said compounds A and B being independently chosen from superabsorbent polyelectrolytes, colloid of nanoparticles of metal oxide or silicon oxide, or mixtures thereof, said nanoparticles comprising ionic groups and said compounds A and B being functionalized by either -NH 2 or -COOH functional groups, with the first proviso that at least one of compounds A or B is a superabsorbent polyelectrolyte, and with the second proviso that the layers of the antireflecting coating other than the last layer do not comprise any bilayer formed from compositions having opposite electrical charges, and - the LbL coating is crosslinked with a coupling agent, such as carbodiimide coupling reagents, inducing chemical linkages between said NH 2 and COOH groups and has a refractive index at 643 nm ranging from 1.40 to 1.50