Method for optimising the formulae for calculating implant power

A process executed by computer for determining adjustment values intended to characterise a target system comprising a target implant and a target eye, said target system being characterised by an optical performance and a power of said target implant, said process comprising:

• obtaining a history comprising, for at least one reference system of a type of said target system, a datum comprising:
• (i) a measured value of its optical performance,
• (ii) at least one of its optical properties including at least one adjustable property;
• and
• (iii) a given value of the power of its reference implant;
• calculation as a function of the same adjustment variable for all reference systems:
• (i) for said at least one reference system, and by using its actual datum, of an error being:
• (i-a) a difference between an initially predicted value and said measured value of its optical performance, or
• (i-b) a difference between an initially predicted value and said given value of the power of its implant;
• and
• (ii) of dispersion of said errors obtained for a set of said reference systems;
• determining an adjustment value of optical property intended to adjust at least one adjustable property of said target system and corresponding to the value of said adjustment variable which minimises said dispersion, and
• determining a performance adjustment value, equal to an average of said errors when said adjustment variable is equal to said adjustment value of optical property, and intended to adjust said optical performance or said power of the target system.

A device for characterisation of a target system comprising a target implant and a target eye, said target system being characterised by an optical performance and a power of said target implant, said device comprising:

• a module for obtaining an adjustment value of optical property intended to adjust at least one adjustable optical property of said target system,
• a module for obtaining an adjustment value of optical performance of said target system;
• a module for determining a correspondence between said power and the optical performance from at least one optical property of the target system including at least one adjustable property, of said adjustment value of optical property and of said performance adjustment value, at least one of said optical properties being obtained from measurements of the target eye;
• wherein the determining of a correspondence between said power and the optical performance comprises:
• determining of said optical performance as a function of said power;
• or
• determining of said power as a function of said optical performance, and wherein the determining comprises:
• (i) adjustment of a value of said adjustable property with said adjustment value of optical property, and
• (ii) adjustment of a value of said optical performance or of said power with said performance adjustment value,
• said adjustment value of optical property having been determined for minimising dispersion of errors, each of said errors being:
• (i) a difference between an initially predicted value, from a given value of said power, of said optical performance and a measured value of said optical performance, or
• (ii) a difference between an initially predicted value, from the measured value of said optical performance, of said power and the given value of said power,
• for a reference system of a type of the actual target system and comprising a reference eye and a reference implant;
• said performance adjustment value having been determined so as to cancel a bias of said errors obtained when said dispersion is minimal.

A device for determining adjustment values intended to characterise a target system comprising a target implant and a target eye, said target system being characterised by an optical performance and a power of said target implant, said device comprising:

• a module for obtaining a history comprising, for at least one reference system of a type of said target system, a datum comprising:
• (i) a measured value of its optical performance,
• (ii) at least one of its optical properties including at least one adjustable property;
• and
• (iii) a given value of the power of its reference implant;
• a calculation module as a function of the same adjustment variable for all the reference systems:
• (i) for said at least one reference system, and by using its actual datum, of an error being:
• (i-a) a difference between an initially predicted value and said measured value of its optical performance, or
• (i-b) a difference between an initially predicted value and said given value of the power of its implant;
• (ii) of dispersion of said errors obtained for a set of said reference systems;
• a module for determining an adjustment value of optical property intended to adjust at least one adjustable property of said target system and corresponding to the value of said adjustment variable which minimises said dispersion, and
• a module for determining a performance adjustment value, equal to an average of said errors when said adjustment variable is equal to said adjustment value of optical property, and intended to adjust said optical performance or said power of the target system.