1. A method for examining an object containing a flowing liquid, the method comprising: illuminating the object with measuring light and recording at least one sequence of first images (I k (i,j); k=1,. .. , N) of the illuminated object, wherein an exposure time for each recording of an image of the at least one sequence of first images (I k (i,j); k=1,. .. , N) is smaller than 1 ms; evaluating, with an evaluation system, the at least one sequence of first images (I k (i,j); k=1,. .. , N) by associating pixels (i,j) in the at least one sequence of first images (I k (i,j); k=1,. .. , N) to which same locations (x,y) of the object are imaged with a first analysis image value, respectively, wherein the first analysis image value depends on fluctuations of image values (I(t,i,j)) of the pixels (i,j) in the at least one sequence of first images (I k (i,j); k=1,. .. , N) in a frequency range above 1 kHz; and evaluating, with the evaluation system, the at least one sequence of first images (I k (i,j); k=1,. .. , N), by further associating pixels (i,j) in the at least one sequence of first images (I k (i,j); k=1,. .. , N) to which same locations (x,y) of the object are imaged with a second analysis image value, respectively, wherein the second analysis image value depends on fluctuations of image values (I(t,i,j)) of the pixels (i,j) in the at least one sequence of first images (I k (i,j); k=1,. .. , N) in a frequency range below 100 Hz, wherein the measuring light illuminating the object comprises wavelengths in a measuring light wavelength range from one of 605 nm to 630 nm, 560 nm to 580 nm, and 794 nm to 814 nm, and wherein the recording the at least one sequence of first images comprises detecting measuring light, wherein a ratio of an intensity of the detected measuring light having wavelengths outside the measuring light wavelength range from a total intensity of the detected measuring light amounts to less than 10%, wherein the evaluation system comprises a processing system including a computer.