A method for planning a refractive treatment of an eye of a patient, the method comprising: determining an effective treatment vector function based on a plurality of prior eye treatments by: for each prior eye treatment of an associated eye: defining a pre-treatment vector characterizing measured pre-treatment high-order aberrations of the associated eye; defining a post-treatment vector characterizing measured post treatment high-order aberrations of the associated eye; deriving the effective treatment vector function using a correlation between the pre-treatment vectors and the post- treatment vectors; wherein deriving the effective treatment vector function from prior treatments further comprises determining intended refractive correction vectors (IRCs) of the associated eyes and determining surgically induced refractive correction vectors (SIRCs) of the associated eyes, each SIRC characterizing a difference between the measured pre-treatment aberrations and the post-treatment aberrations of an associated eye; defining an input vector based on measured pre-treatment high-order aberrations of the eye of the patient, characterised in that defining the input vector comprises identifying a target refraction of the eye of the patient to be induced by the refractive treatment and determining an intended refractive correction vector characterizing a difference between the measured pre-treatment aberrations of the eye of the patient and the target; and deriving the treatment of the eye of the patient by applying the effective treatment vector function to the input vector. determining an effective treatment vector function based on a plurality of prior eye treatments by: for each prior eye treatment of an associated eye: defining a pre-treatment vector characterizing measured pre-treatment high-order aberrations of the associated eye; defining a post-treatment vector characterizing measured post treatment high-order aberrations of the associated eye; deriving the effective treatment vector function using a correlation between the pre-treatment vectors and the post- treatment vectors; wherein deriving the effective treatment vector function from prior treatments further comprises determining intended refractive correction vectors (IRCs) of the associated eyes and determining surgically induced refractive correction vectors (SIRCs) of the associated eyes, each SIRC characterizing a difference between the measured pre-treatment aberrations and the post-treatment aberrations of an associated eye; defining an input vector based on measured pre-treatment high-order aberrations of the eye of the patient, characterised in that defining the input vector comprises identifying a target refraction of the eye of the patient to be induced by the refractive treatment and determining an intended refractive correction vector characterizing a difference between the measured pre-treatment aberrations of the eye of the patient and the target; and deriving the treatment of the eye of the patient by applying the effective treatment vector function to the input vector. for each prior eye treatment of an associated eye: defining a pre-treatment vector characterizing measured pre-treatment high-order aberrations of the associated eye; defining a post-treatment vector characterizing measured post treatment high-order aberrations of the associated eye; deriving the effective treatment vector function using a correlation between the pre-treatment vectors and the post- treatment vectors; defining a pre-treatment vector characterizing measured pre-treatment high-order aberrations of the associated eye; defining a post-treatment vector characterizing measured post treatment high-order aberrations of the associated eye; deriving the effective treatment vector function using a correlation between the pre-treatment vectors and the post- treatment vectors; wherein deriving the effective treatment vector function from prior treatments further comprises determining intended refractive correction vectors (IRCs) of the associated eyes and determining surgically induced refractive correction vectors (SIRCs) of the associated eyes, each SIRC characterizing a difference between the measured pre-treatment aberrations and the post-treatment aberrations of an associated eye; defining an input vector based on measured pre-treatment high-order aberrations of the eye of the patient, characterised in that defining the input vector comprises identifying a target refraction of the eye of the patient to be induced by the refractive treatment and determining an intended refractive correction vector characterizing a difference between the measured pre-treatment aberrations of the eye of the patient and the target; and deriving the treatment of the eye of the patient by applying the effective treatment vector function to the input vector.