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.

A method of designing lenses includes defining a material having an inside reflective surface spanning an area, and providing an optical design algorithm which defines a plurality of oxels across the area. Each oxel has a plurality of sub-elements including a center sub-element and a plurality of neighboring sub-elements. Based on a defined optical prescription for the inside reflective surface, an optically corrected reference 3D surface is calculated for each oxel having spherical and cylindrical corrections relative to a spherical contour which spans a predetermined field of view (FOV) with respect to a single (common) predetermined reference point. A position of at least a first of the sub-elements for each of the oxels is moved to approach respective final 3D positions on the optically corrected reference 3D surface, where the moving is constrained to be along an individual line connecting each of the first sub-elements to the single predetermined reference point.

A system and method for determining an adapted ophthalmic device for a wearer, the method including acquiring a set of parameters values relating to the wearer, determining at least a task to be performed by the wearer involving visual exploration, using a computing system, determining a value of a criterion assessing an efficiency of the wearer's visual exploration strategy for the task, and determining an optical design of an ophthalmic device to be worn by a wearer according to the determined value of the criterion.

[Problem] To provide an evaluation method for evaluating spectacle lenses that is capable of objectively evaluating spectacle lenses suitable for a user by measuring brain activity, and a design method for designing spectacle lenses using the evaluation method. [Solution] A subject is allowed to wear to-be-evaluated lenses, and the subject is allowed to visually observe a visual stimulus object used to evoke an activity of a specific part of the visual cortex of the brain through the to-be-evaluated lenses, and an evoked activity of the specific part of the brain's visual cortex when the visual stimulus object is visually observed by the to-be-evaluated lenses is measured by an electroencephalograph or by a magnetoencephalograph, and the spectacle lenses are evaluated based on time (latency) from when a visual stimulus is received till when a change is caused thereby or based on the magnitude (amplitude) of activity.

A method for determining optical power of an optical lens to be placed in front of an eye of a person, the method including: a first distance determining during which a first gazing distance is determined, which is the distance between the eye of the person and a first visual stimulus when the person gazes at the first visual stimulus in a given gazing direction with a first level of attention: a second distance determining during which a second gazing distance is determined, which is the distance between the eye of the person and a second visual stimulus when the person gazes at the second visual stimulus in the given gazing direction with a second level of attention different from the first level of attention; and an optical power determining during which the optical power adapted for the person is determined based on the first and second gazing distances.

Provided is technology that makes it possible to design a progressive power lens appropriate for visual behavior of a subject. A method for designing a progressive power lens includes: a step (a) of determining a relationship between a line-of-sight passage position on a surface of a progressive power lens through which a line of sight of a subject wearing the progressive power lens passes and a reactive accommodation amount that the subject exhibits when the line of sight passes through the line-of-sight passage position, based on visual behavior of the subject; a step (b) of judging whether or not the reactive accommodation amount is within an appropriate range; a step (c) of determining a correction method for correcting the progressive power lens based on a result of judgement made in the step (b); and a step (d) of correcting a design of the progressive power lens based on the correction method determined in the step (c).

When an addition power at a position corresponding to a fitting point within a prescription addition power is greater than a target addition power set according to a target distance, the target addition power is set as an addition power between a progression-start point and a progression-end point on a principal meridian, and in addition the average gradient of an addition power between the progression-start point and the fitting point is set to differ from an average gradient of an addition power between the fitting point and the progression-end point. When the addition power at the position corresponding to the fitting point within the prescription addition power is equal to or smaller than the target addition power, a gradient of the addition power is made constant in a partial region including at least the fitting point between the progression-start point and the progression-end point on the principal meridian.

A vision simulation, on assumption that spectacles are worn, is performed for a first model designed by setting a target additional power of a desirable value at a position corresponding to a fitting point on a principal meridian. A correction amount is computed for correcting the difference between a simulation value obtained for the additional power at the position corresponding to the fitting point on the principal meridian through the vision simulation and the target additional power. A second model is designed by replacing the additional power with a value obtained by the addition of the calculated correction amount to the target additional power.

A computer implemented method for determining an ophthalmic lens for providing to a wearer a comfortable vision when looking at electronic displays. The method includes: a wearer near vision electronic display use determining to determine at least an electronic display the wearer intends to use in a near vision situation; a wearer intermediate vision electronic display use determining to determine at least an electronic display the wearer intends to use in an intermediate vision situation; an usage priority rank determining to determine an usage priority rank between the near vision electronic display during the wearer near vision electronic display use determining and the intermediate vision electronic display during the wearer intermediate vision electronic display use determining; an ophthalmic lens determining to determine an ophthalmic lens from the at least one near vision electronic display or the at least one intermediate vision electronic display and the usage priority rank.

The invention relates to a method of selection of an ophthalmic lens suitable for correcting at least an optical impairment of an eye of a wearer who observes a screen. According to the invention the method comprises the steps of: determining at least a characteristic of posture of the wearer observing said screen, determining a dioptric power value associated to said vision zone allowing the wearer when wearing the ophthalmic lens to have an easier reading of said screen, determining at least one characteristic of filtering means to adjust the light exposure of the wearer to said screen, and determining the vision zone based on dioptric power value, characteristic of posture of the wearer and characteristic of filtering means so that the vision comfort of the wearer is optimized when wearing the ophthalmic lens while observing a screen