A liquid-crystal lens comprising an electrode on a substrate and a liquid-crystal medium, characterised in that the liquid-crystal medium contains - 40% or more of one or more compounds of formula I in which R 11 and R 12 identically or differently, denote H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in which one or more H atoms may be replaced by fluorine, L 11 , L 12 , L 13 independently of one another, denote H, Cl or F, denotes denotes Z 1 denotes denote a single bond, -CH 2 CH 2 -, -CH=CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -C 2 F 4 -, -CF=CF-, -CH=CHCH 2 O-, n is 0 or 1, wherein the one or more compounds of formula I are selected from the compounds of the formulae I-1, I-2 and I-3 and wherein the medium comprises one or more compounds of formula I-1, one or more compounds of formula I-2 and one or more compounds of formula I-3: in which R 11 and R 12 have the meanings defined for formula I, Z 1 denotes -CH 2 CH 2 - or a single bond, and L 11 to L 13 each, independently of one another, denote H or F; and - 10% to 40% by weight of one or more compounds of formula IIZ in which R 2 has the meanings of R 11 above, X 2 denotes F, Cl, CF 3 , OCF 3 , CN or NCS, L 21 denotes H or F, L 2 denotes H or alkyl having 1 to 6 C atoms, m is 0 or 1. - 40% or more of one or more compounds of formula I in which R 11 and R 12 identically or differently, denote H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in which one or more H atoms may be replaced by fluorine, L 11 , L 12 , L 13 independently of one another, denote H, Cl or F, denotes denotes Z 1 denotes denote a single bond, -CH 2 CH 2 -, -CH=CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -C 2 F 4 -, -CF=CF-, -CH=CHCH 2 O-, n is 0 or 1, wherein the one or more compounds of formula I are selected from the compounds of the formulae I-1, I-2 and I-3 and wherein the medium comprises one or more compounds of formula I-1, one or more compounds of formula I-2 and one or more compounds of formula I-3: in which R 11 and R 12 have the meanings defined for formula I, Z 1 denotes -CH 2 CH 2 - or a single bond, and L 11 to L 13 each, independently of one another, denote H or F; and R 11 and R 12 identically or differently, denote H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH 2 -groups may be replaced by or and in which one or more H atoms may be replaced by fluorine, L 11 , L 12 , L 13 independently of one another, denote H, Cl or F, denotes denotes Z 1 denotes denote a single bond, -CH 2 CH 2 -, -CH=CH-, -CF 2 O-, -OCF 2 -, -CH 2 O-, -OCH 2 -, -C 2 F 4 -, -CF=CF-, -CH=CHCH 2 O-, n is 0 or 1, Z 1 denotes -CH 2 CH 2 - or a single bond, and L 11 to L 13 each, independently of one another, denote H or F; - 10% to 40% by weight of one or more compounds of formula IIZ in which R 2 has the meanings of R 11 above, X 2 denotes F, Cl, CF 3 , OCF 3 , CN or NCS, L 21 denotes H or F, L 2 denotes H or alkyl having 1 to 6 C atoms, m is 0 or 1. R 2 has the meanings of R 11 above, X 2 denotes F, Cl, CF 3 , OCF 3 , CN or NCS, L 21 denotes H or F, L 2 denotes H or alkyl having 1 to 6 C atoms, m is 0 or 1. <EOS>