The present invention relates to a cosmetic or dermatological composition in the form of an emulsion comprising in a physiologically acceptable support: a) at least one aqueous phase and b) at least one oily phase and c) at least one merocyanine compound of formula (1) or one of its isomeric geometrical forms E / E- or E / Z-: in which R is a C1-C22 alkyl group, a C2-C22 alkenyl group, a C2-C22 alkinyl group or a C3 cycloalkyl group； -C22 or a C3-C22 cycloalkenyl, said groups may be interrupted by one or more O and d) at least one emulsifying system containing at least one gemini surfactant. Another subject of the present invention is constituted by a non-therapeutic cosmetic process for the care and / or makeup of a keratinous material comprising the application on the surface of said keratinous material of at least one composition according to the invention such as defined above. It also relates to a non-therapeutic cosmetic process for limiting the darkening of the skin and / or improving the color and / or the homogeneity of the complexion, comprising the application to the surface of the keratinous material of at least one composition as defined above . It also relates to a non-therapeutic cosmetic method for preventing and / or treating the signs of aging of a keratinous material comprising the application to the surface of the keratinous material of at least one composition as defined above.La présente invention concerne une composition cosmétique ou dermatologique sous forme d'émulsion comprenant dans un support physiologiquement acceptable : a) au moins une phase aqueuse et b) au moins une phase huileuse et c) au moins un composé mérocyanine de formule (1) ou l'une de ses formes géométriques isomères E/E- ou E/Z-: dans laquelle R est un groupement alkyle C1-C22, un groupement alcényle en C2-C22, un groupement alcinyle en C2-C22, un groupement cycloalkyle en C3-C22 ou un cycloalcényle en C3-C22, lesdits groupements pouvant être interrompus par un ou plusieur
