Ametropia progression indicating device

An indicating device for indicating the ametropia progression of a wearer over a predetermined period of time as a function of the wearer's age according to at least the type of ophthalmic lens the wearer may use, wherein

• the device comprises first and second members connected together in a moveable manner, and a third member connected to the first and second members in a moveable manner,
• the first member having a first field including a plurality of values of input data and a second field including a plurality of values of output data representative of the ametropia of a wearer,
• the second member having at least a selection means and an indication means,
• the selection means being arranged to select among movement of the second member a value of the input data corresponding to a wearer, and
• the indication means being associated with a type of ophthalmic lens and arranged to indicate among movement of the second member the value of the output data on the first member corresponding to the ametropia of the wearer after the predetermined period of time, and
• wherein the third member comprises:
• a field including a plurality of values of second input data,
• a selecting means arranged to select among movement of the third member a value of the input data from the first member, and
• an opening arranged to display at least a part of the second field of the first member among movement of the third member, wherein the ametropia progression of the wearer is a function of the wearer's age.