Device (1; 10; 20; 30; 40) for optical examination of a turbid medium comprising joints, comprising: an illumination system (2; 12; 22; 32; 42) adapted for illuminating the turbid medium to be examined; and an imaging device adapted for generating images of the turbid medium from detected light, which detected light is transmitted from the illumination system (2; 12; 22; 32; 42); wherein the illumination system (2; 12; 22; 32; 42) is adapted to be operable in at least: a first mode in which a first area is illuminated, the first area comprising the turbid medium and a surrounding area, and a second mode in which a plurality of selected regions of the first area are illuminated; wherein the device comprises a control unit adapted to analyze a first image acquired by the imaging device with the illumination system (2; 12; 22; 32; 42) in the first mode by recognizing a position of the turbid medium as a shadow in the first image to determine the plurality of selected regions, in which the turbid medium is situated, for illumination in the second mode, wherein the plurality of selected regions comprise positions of joints and intermediate tissue. an illumination system (2; 12; 22; 32; 42) adapted for illuminating the turbid medium to be examined; and an imaging device adapted for generating images of the turbid medium from detected light, which detected light is transmitted from the illumination system (2; 12; 22; 32; 42); wherein the illumination system (2; 12; 22; 32; 42) is adapted to be operable in at least: a first mode in which a first area is illuminated, the first area comprising the turbid medium and a surrounding area, and a second mode in which a plurality of selected regions of the first area are illuminated; wherein the device comprises a control unit adapted to analyze a first image acquired by the imaging device with the illumination system (2; 12; 22; 32; 42) in the first mode by recognizing a position of the turbid medium as a shadow in the first image to determine the plurality of selected regions, in which the turbid medium is situated, for illumination in the second mode, wherein the plurality of selected regions comprise positions of joints and intermediate tissue. a first mode in which a first area is illuminated, the first area comprising the turbid medium and a surrounding area, and a second mode in which a plurality of selected regions of the first area are illuminated; wherein the device comprises a control unit adapted to analyze a first image acquired by the imaging device with the illumination system (2; 12; 22; 32; 42) in the first mode by recognizing a position of the turbid medium as a shadow in the first image to determine the plurality of selected regions, in which the turbid medium is situated, for illumination in the second mode, wherein the plurality of selected regions comprise positions of joints and intermediate tissue. wherein the device comprises a control unit adapted to analyze a first image acquired by the imaging device with the illumination system (2; 12; 22; 32; 42) in the first mode by recognizing a position of the turbid medium as a shadow in the first image to determine the plurality of selected regions, in which the turbid medium is situated, for illumination in the second mode, wherein the plurality of selected regions comprise positions of joints and intermediate tissue.