Method for estimating an eye-to-glasses distance, between a characteristic plane of a pair of glasses and a characteristic point of an eye of a wearer of said pair of glasses, said characteristic plane of the pair of glasses being substantially parallel to the average plane of the contours of lenses (150G, 150D) of the pair of glasses, using a determination device comprising an image sensor, the method comprising the following steps: a) the image sensor acquiring at least two separate images (301, 302, 303) of at least part of the head of the wearer, in which images the head of the wearer has different angular positions (α) with respect to the image sensor about a pivoting axis that is substantially parallel to said characteristic plane and that is substantially transverse to the optical axis of the image sensor, b) a computing unit determining, for each acquired image (301, 302, 303), an angle of inclination (α 301, α 302, α 303) of the head of the wearer with respect to the image sensor, measured between the optical axis of the image sensor and a plane attached to the head of the wearer that is substantially parallel to said pivoting axis and substantially orthogonal to said characteristic plane, characterized in that it also comprises the following steps: c) said computing unit acquiring at least two predetermined simulated values (VG1, VG2, VG3) of the sought eye-to-glasses distance, d) said computing unit iteratively trigonometrically computing, for each acquired image (301, 302, 303) and with each acquired simulated value (VG1, VG2, VG3), a morphological distance (EG1 301, EG2 301, EG3 301, EG1 302, EG2 302, EG3 302, EG1 303, EG2 303, EG3 303) between the characteristic point of the eye of the wearer and the plane attached to the head of the wearer, taking into account said angle of inclination (α 301, α 302, α 303), and e) said computing unit selecting, from among the simulated values (VG1, VG2, VG3) of the eye-to-glasses distance, the value closest to the real value of the eye-to-glasses distance of the wearer, on the basis of the morphological distances (EG1 301, EG2 301, EG3 301, EG1 302, EG2 302, EG3 302, EG1 303, EG2 303, EG3 303) computed in step d), wherein, in step e): - for each simulated value (VG1, VG2, VG3), a dispersion rate of the morphological distances associated with this simulated value (VG1, VG2, VG3) is determined, and - the selected simulated value is the one for which the morphological distances are the least dispersed. a) the image sensor acquiring at least two separate images (301, 302, 303) of at least part of the head of the wearer, in which images the head of the wearer has different angular positions (α) with respect to the image sensor about a pivoting axis that is substantially parallel to said characteristic plane and that is substantially transverse to the optical axis of the image sensor, b) a computing unit determining, for each acquired image (301, 302, 303), an angle of inclination (α 301, α 302, α 303) of the head of the wearer with respect to the image sensor, measured between the optical axis of the image sensor and a plane attached to the head of the wearer that is substantially parallel to said pivoting axis and substantially orthogonal to said characteristic plane, c) said computing unit acquiring at least two predetermined simulated values (VG1, VG2, VG3) of the sought eye-to-glasses distance, d) said computing unit iteratively trigonometrically computing, for each acquired image (301, 302, 303) and with each acquired simulated value (VG1, VG2, VG3), a morphological distance (EG1 301, EG2 301, EG3 301, EG1 302, EG2 302, EG3 302, EG1 303, EG2 303, EG3 303) between the characteristic point of the eye of the wearer and the plane attached to the head of the wearer, taking into account said angle of inclination (α 301, α 302, α 303), and e) said computing unit selecting, from among the simulated values (VG1, VG2, VG3) of the eye-to-glasses distance, the value closest to the real value of the eye-to-glasses distance of the wearer, on the basis of the morphological distances (EG1 301, EG2 301, EG3 301, EG1 302, EG2 302, EG3 302, EG1 303, EG2 303, EG3 303) computed in step d), - for each simulated value (VG1, VG2, VG3), a dispersion rate of the morphological distances associated with this simulated value (VG1, VG2, VG3) is determined, and - the selected simulated value is the one for which the morphological distances are the least dispersed.