After the collection of the data, the researcher will establish the variables, including all clinical data, the Doppler echography data, the CVD symptoms, and the class to which the subject belongs according to the CEAP Classification ( ranging from 0 to 6). All these data will be analyzed in relation to the presence of onychodystrophy in each patient. Other variables that can be related to onychodystrophy will also be registered: type of footwear, feet deformation, personal history and local factors considered potentially responsible for the presence of onychodystrophy. Finally, the researcher will perform the statistical analysis relating all the variables to finally determine whether there exists or not a correlation betwen (CVD) and onychodystrophy.