Cosmetic or dermatological composition comprising a merocyanine and an acrylic polymer The present invention relates to a cosmetic or dermatological composition in the emulsion form, 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 the E/E- or E/Z- geometrical isomer forms thereof: in which R is a C1-C22 alkyl group, a C2-C22 alkenyl group, a C2-C22 alkynyl group, a C3-C22 cycloalkyl group or a C3-C22 cycloalkenyl group, said groups possibly being interrupted with one or more O, and d) at least one particular acrylic polymer. Another subject of the present invention is constituted of a non-therapeutic cosmetic process for caring for and/or making up a keratin material, comprising the application, to the surface of said keratin material, of at least one composition according to the invention as defined above. The invention also relates to a non-therapeutic cosmetic process for limiting the darkening of the skin and/or improving the colour and/or uniformity of the complexion, comprising the application, to the surface of the keratin material, of at least one composition as defined previously. The invention also relates to a non-therapeutic cosmetic process for preventing and/or treating the signs of ageing of a keratin material, comprising the application, to the surface of the keratin material, of at least one composition as defined previously.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 des formes isomères à géométrie E/E ou E/Z de celui-ci； dans cette formule, R représente un groupe alkyle C1-C22, un groupe alcényle C2-C22, un groupe alcynyle C2-C22, un groupe cycloalkyle C3-C22 ou un groupe cycloalcén
