The invention relates to a passive sensing means (100) for a contact lens, in particular for detecting variations of a physiological parameter, comprising an inductance (101) having a plurality of concave arc-shaped segments (1011, 1012, 1013) with respect to a center point (110) of the sensing means (100), wherein the radius of curvature of at least one segment (1011, 1012, 1013) at a point thereof is greater than the distance between said point and the center point (110) of the passive sensing means (101). The invention also relates to an alternative passive sensing means with an inductive element comprising a plurality of inductances, as well as to a contact lens with incorporated passive sensing means and to a method for manufacturing said contact lens.
