IMAGE No. 13/17 Ratok®derm microphotoemission: UVB 80%, UVA 20%. This microirradiation only involves the depigmented skin surface, point by point, covering 2-3 millimetres of surface in few seconds' subsequent applications; the treated vitiligo patch and the patches involved in skin intraconductivity receive a significantly lower quantity of UV rays (100 cm² on average).