Abstract: There is described a medical device for management of the axial length growth of an eye of a subject. The device comprises a central region having a first power, a transition region surrounding the central region, and a peripheral region surrounding the transition region and having a second power. The transition region has a width at most equal to 1.5 mm. The second power is chosen based on the first power to achieve a target net power, the target net power being the addition of the first power and the second power. The surface area of the central and peripheral regions is chosen as a function of the surface area of the pupil of the eye. Furthermore, the curve of power within the transition region is steep between the first power and the second power so that the transition region generates no optically usable power.