摘要:
A method for determining an optical system of a personalized progressive lens for a given wearer including: a) providing a mean direction of gaze determined for the wearer in a reference frame tied to the head of the wearer; b) determining a target value for at least one optical design parameter as a function of the mean direction of gaze determined in a); c) calculating the optical system of the progressive lens by an optical optimization procedure on the basis of target values, wherein the target value of each optical design parameter as a function of the mean direction of gaze determined in b) is a target value.
摘要:
An ophthalmic progressive addition lens for a presbyopic wearer which has a prescribed far vision mean refractive power a non nil prescribed addition, ADDp, the lens having a far vision reference point, a mean refractive power, PPO(α, β), a module of resulting astigmatism, ASR(α, β), a meridian line, ML(α, β), the (α, β) functions being determined in as-worn conditions of the lens by the wearer for gaze directions (α, β) joining the center of rotation of the eye, CRE, and the lens, wherein α is a lowering angle in degree and β is an azimuth angle in degree, and wherein a lens criterion, CRIT, fulfils following requirement: 0.38≤CRIT≤4.50, where: CRIT=NumeratorCRIT/DenominatorCRIT, NumeratorCRIT=(A1/A2)+(PPO(αFV, βFV)/(100·ADDp)); A1=α100%−α85%; A2=α100%−α60%; DenominatorCRIT=[(PeaksMean/ADDp)±(PPO(αFV,βFV)/(8·ADDp))]3.
摘要:
An ophthalmic progressive addition lens for a myopic or emmetropic presbyopic wearer which has a prescribed far vision mean refractive power and a non nil prescribed addition, ADDp, the lens having a far vision reference point, a mean refractive power, PPO(α, β), a module of resulting astigmatism, ASR(α, β), a meridian line, ML(α, β), the (α, β) functions being determined in as-worn conditions of the lens by the wearer for gaze directions (α, β) joining the center of rotation of the eye, CRE, and the lens, wherein α is a lowering angle in degree and β is an azimuth angle in degree, and wherein a lens criterion, A1/A2, fulfils: A1/A2≥0.50, wherein: A1=α100%−α85%; A2=α100%−α60%.
摘要:
The invention relates to a method for determining at least one optical design parameter for a progressive ophthalmic lens intended to be fitted in a frame chosen by a wearer, depending on the visual behaviour of the latter, comprising the following steps: a) the wearer is placed in a situation in which he carries out a visual task at a first working distance; b) during this visual task, at least two gaze directions of the wearer at this first working distance are determined in a frame of reference of the head of the wearer; c) a relative position of a surface related to said frame or to an ophthalmic lens intended to be fitted in said frame is determined in this frame of reference of the head of the wearer; d) for each gaze direction at the first working distance determined in step b) the intersection between this gaze direction at the first working distance and said surface is determined so as to establish a map of these points of intersection on this surface; and e) said sought-after optical design parameter is deduced from this map.