Abstract: A system for determining a modification or a change of an initial myopia control solution used by a myopic subject, including a device for determining a real initial value and real ulterior value of an eye state parameter representative of the myopia degree of the eye of the subject at an initial time and at an ulterior time, one or more memories having in memory statistical data relative to the statistical evolution of the eye state parameter with time while the initial myopia control solution is implemented, one or more processors programmed to determine an expected ulterior value of a magnitude linked to the eye state parameter at the ulterior time based on the statistical data relative to the statistical evolution of the eye state parameter with time while the initial myopia control solution is implemented.

Abstract: A system for determining an appropriate moment for modifying or changing an initial myopia control solution used by a myopic subject at an initial time having a database of available myopia control solutions and data relative to the evolution of the efficacy of each myopia control solution with criterion including determining the value of said criterion at an ulterior time, determining, based on this value, the efficacy of this initial myopia control solution and the efficacy of other myopia control solutions of said database at this ulterior time, comparing the efficacy of said initial myopia control solution and the efficacy of other myopia control solutions of said database determined for said ulterior time, and when the efficacy of said initial myopia control solution is lower than the efficacy of at least one of said other myopia control solutions at said ulterior time, determining appropriate moment depending on said ulterior time.