which makes it possible to determine both the width and depth of the wrinkles.
The first day of the trial and prior to the application of the formulations,
the depth and width of a given wrinkle were measured,
which would be the same throughout the study period.
In addition, it has a flat probe with surface area of 1.5cm2,
which is applied at constant pressure on the skin.
This probe determines the amount of water present in the surface layers of the skin.