1. A method for comparing at least two iris images comprising a step determining M measurements q i,j (1) representative of the quality level associated with M regions making up the first image, said regions being centered on M measurement points, a step determining M measurements q i,j (2) representative of the quality level associated with M regions making up the second image, said measurements being centered on M measurement points, the M measurements of the second image corresponding to the M measurements of the first image by the fact that the M measurement points of the second image correspond to the M measurement points of the first image, said method comprising: merging the quality measurements q i,j (1) , q i,j (2) , M merged measurements q i,j (f) , being obtained by the combination of two corresponding measurements belonging to the two images; selecting N regions exhibiting the N highest quality levels; encoding the two images by using the N selected regions so as to obtain a binary code for each image; and comparing the two binary codes so as to quantify the level of similarity between the two images.