A method for measuring the stability of a tear film of a patient by means of a device comprising: - a backlit translucent plate equipped with a test chart that is positioned in front of at least one eye of a patient, the test chart being provided with a pattern consisting of a succession of alternating light and dark lines (12, 13) that reflect from the eye of the patient, - at least one digital photographic camera (22, 23) connected to a computing system provided with means for processing and analyzing images, an objective of the camera pointing toward the patient's eye in order to photograph a reflection of the pattern of the test chart from the patient's eye, said method being such that, - the means for processing and analyzing images are configured to - detect deformations of said light or dark lines of the pattern of the test chart reflected from the eye of the patient and - identify, via a comparison of the position of image points on the edge of the lines with respect to an estimated line edge (74, 74') of the lines, tear-film micro-movements revealed by these deformations, the method comprises, from a start time at which an eyelid blinks: - successively capturing images, - successively detecting regions of micro-movement in the images and successively computing and storing data on the positions, area and number of regions of micro-movements of the tear film in each image by means of the means for processing and analyzing images, and - computing and storing, on the basis of the successively computed positions, area and number of regions of micro-movement of the tear film, a measurement of the amplitude of the regions of micro-movement as a function of time. - a backlit translucent plate equipped with a test chart that is positioned in front of at least one eye of a patient, the test chart being provided with a pattern consisting of a succession of alternating light and dark lines (12, 13) that reflect from the eye of the patient, - at least one digital photographic camera (22, 23) connected to a computing system provided with means for processing and analyzing images, an objective of the camera pointing toward the patient's eye in order to photograph a reflection of the pattern of the test chart from the patient's eye, said method being such that, - the means for processing and analyzing images are configured to - detect deformations of said light or dark lines of the pattern of the test chart reflected from the eye of the patient and - identify, via a comparison of the position of image points on the edge of the lines with respect to an estimated line edge (74, 74') of the lines, tear-film micro-movements revealed by these deformations, - the means for processing and analyzing images are configured to - detect deformations of said light or dark lines of the pattern of the test chart reflected from the eye of the patient and - identify, via a comparison of the position of image points on the edge of the lines with respect to an estimated line edge (74, 74') of the lines, tear-film micro-movements revealed by these deformations, the method comprises, from a start time at which an eyelid blinks: - successively capturing images, - successively detecting regions of micro-movement in the images and successively computing and storing data on the positions, area and number of regions of micro-movements of the tear film in each image by means of the means for processing and analyzing images, and - computing and storing, on the basis of the successively computed positions, area and number of regions of micro-movement of the tear film, a measurement of the amplitude of the regions of micro-movement as a function of time. - successively capturing images, - successively detecting regions of micro-movement in the images and successively computing and storing data on the positions, area and number of regions of micro-movements of the tear film in each image by means of the means for processing and analyzing images, and - computing and storing, on the basis of the successively computed positions, area and number of regions of micro-movement of the tear film, a measurement of the amplitude of the regions of micro-movement as a function of time.