Abstract: Method and contact lens (3) for measuring a subject's three dimensional eye movement including torsional movement. A video camera (1) is provided for recording an image of the subject's eye (2). The contact lens (3) is provided for placement over the subject's eye (2). The contact lens (3) comprises one or more markers (3a,3b) that are detectable by the video camera (1) and are positioned at a lateral offset (D) with respect to a central part (3p) of the contact lens (3). The one or more markers (3a,3b) are configured for detecting torsional rotation (R) of the subject's eye (2) around a line of sight axis (C) of the subject's eye (2) by using the video camera (1) to track a position of the one or more markers (3a,3b).

Abstract: Method and contact lens (3) for measuring a subject's three dimensional eye movement including torsional movement. A video camera (1) is provided for recording an image of the subject's eye (2). The contact lens (3) is provided for placement over the subject's eye (2). The contact lens (3) comprises one or more markers (3a,3b) that are detectable by the video camera (1) and are positioned at a lateral offset (D) with respect to a central part (3p) of the contact lens (3). The one or more markers (3a,3b) are configured for detecting torsional rotation (R) of the subject's eye (2) around a line of sight axis (C) of the subject's eye (2) by using the video camera (1) to track a position of the one or more markers (3a,3b).

Abstract: The invention relates to a method for quantification of a degree of obstruction in a liquid passageway, notably a male urethra. Data related to sonic waves generated by a liquid passing the obstruction may be accessed from a suitable file, or, alternatively may be directly obtained as a result of a measuring step 2. For determining the degree of obstruction of the urethra the measuring step 2 may be performed by arranging at least one sensor, notably a microphone, in the area of the perineum for detecting sonic waves generated by a liquid (urine) passing the obstruction. At the step 5 the power spectrum of the obtained data related to the sonic waves is calculated, after which a suitable feature 6a, 6b, or 6c representative of the power spectrum is selected. Preferable embodiments of the feature comprise a weighted average frequency of the power spectrum, a standard deviation of the power spectrum, or a skewness of the power spectrum, discussed above.