The present invention relates to a cosmetic or dermatological composition comprising, in a physiologically acceptable support: a) at least one oily phase and b) at least one merocyanine compound corresponding to formula (1) below, and also 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, the said groups possibly being substituted with one or more O, and c) at least one insoluble organic UV-screening agent and/or one insoluble inorganic UV-screening agent. The present invention also relates to a non-therapeutic cosmetic process for caring for and/or making up a keratin material, comprising the application, to the surface of the 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. It also relates to a non-therapeutic cosmetic process for preventing and/or treating 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 presente invención se refiere a una composición cosmética o dermatológica que comprende, en un soporte fisiológicamente aceptable: a) al menos una fase aceitosa y b) al menos un compuesto de merocianina de la fórmula (1) definida más adelante en la presente y c) al menos un agente de filtro UV orgánico elegido de: v) un agente de filtro UV orgánico lipófilo líquido, vi) un agente de filtro UV orgánico hidrófilo, vii) un agente de filtro UV de triazina y viii) mezclas de estos y d) al menos un agente de filtro UV orgánico diferente del compuesto de merocianina cuando el agente de filtr
