Computing method implemented by computational means of the optical system of an ophthalmic lens intended to be worn in a spectacle frame that is personalized for a given wearer having a unifocal prescription, the computing method comprising the following steps: - providing the power prescription of the wearer; - defining a distance between the eye rotation centre and the back face of the ophthalmic lens, along a fixation axis (α, β) of the wearer; - defining a pantoscopic angle; - defining a wrap; - defining a reference point P of the prescription corresponding to a lowering α P of the gaze comprised between -10° and +25° and a lateral gaze movement β P comprised between -10° and +10°, the power of the lens at the point P being equal to the prescription of the wearer; - defining an upper zone defined by values α of the lowering of the gaze of the wearer, along a gaze-lowering path, comprised between α P -30° and α P, and by values β of the lateral gaze movement of the wearer, parallelly to an axis of lateral movement of the gaze, comprised between β P -30° and β P +30°; and - defining a lower zone defined by values α of the lowering of the gaze of the wearer, along a gaze-lowering path, comprised between α P and α P +30°, and by values β of the lateral gaze movement of the wearer, parallelly to an axis of lateral movement of the gaze, comprised between β P -30° and β P +30°; and wherein said ophthalmic lens is computed so that: - the power of the lens at the point P is substantially equal to the prescription of the wearer; - in the upper zone, with respect to the point P, the average power ΔPui Sup varies, along the gaze-lowering path, continuously and monotonically between the point P and a point P Sup that is the point of maximum amplitude of variation in the value of the power, in absolute value, the value of the difference in average power between the points P Sup and P, ΔPui SupMax =Pui(P Sup) -Pui being comprised between -0.1 and -0.4 dioptres; - in the lower zone, with respect to the point P, the average power ΔPui Inf varies, along the gaze-lowering path, continuously and monotonically between the point P and a point P Inf that is the point of maximum amplitude of variation in the value of the power, in absolute value, the value of the difference in average power between the points P Inf and P, ΔPui InfMax =Pui(P Inf)-Pui being comprised between +0.1 and +0.4 dioptres; and - the average power gradient along the gaze-lowering path is lower than 4×10 -2 ×ΔPui total, where: Δ Pui total = Δ Pui SupMax + Δ Pui InfMax and said average power gradient is expressed in dioptres per degree. - providing the power prescription of the wearer; - defining a distance between the eye rotation centre and the back face of the ophthalmic lens, along a fixation axis (α, β) of the wearer; - defining a pantoscopic angle; - defining a wrap; - defining a reference point P of the prescription corresponding to a lowering α P of the gaze comprised between -10° and +25° and a lateral gaze movement β P comprised between -10° and +10°, the power of the lens at the point P being equal to the prescription of the wearer; - defining an upper zone defined by values α of the lowering of the gaze of the wearer, along a gaze-lowering path, comprised between α P -30° and α P, and by values β of the lateral gaze movement of the wearer, parallelly to an axis of lateral movement of the gaze, comprised between β P -30° and β P +30°; and - defining a lower zone defined by values α of the lowering of the gaze of the wearer, along a gaze-lowering path, comprised between α P and α P +30°, and by values β of the lateral gaze movement of the wearer, parallelly to an axis of lateral movement of the gaze, comprised between β P -30° and β P +30°; - the power of the lens at the point P is substantially equal to the prescription of the wearer; - in the upper zone, with respect to the point P, the average power ΔPui Sup varies, along the gaze-lowering path, continuously and monotonically between the point P and a point P Sup that is the point of maximum amplitude of variation in the value of the power, in absolute value, the value of the difference in average power between the points P Sup and P, ΔPui SupMax =Pui(P Sup) -Pui being comprised between -0.1 and -0.4 dioptres; - in the lower zone, with respect to the point P, the average power ΔPui Inf varies, along the gaze-lowering path, continuously and monotonically between the point P and a point P Inf that is the point of maximum amplitude of variation in the value of the power, in absolute value, the value of the difference in average power between the points P Inf and P, ΔPui InfMax =Pui(P Inf)-Pui being comprised between +0.1 and +0.4 dioptres; and - the average power gradient along the gaze-lowering path is lower than 4×10 -2 ×ΔPui total, where: Δ Pui total = Δ Pui SupMax + Δ Pui InfMax and said average power gradient is expressed in dioptres per degree.