EP2220535A2

EP2220535A2 - Progressive ophthalmic lens

Info

Publication number: EP2220535A2
Application number: EP08864251A
Authority: EP
Inventors: Hélène De Rossi; Natalia Dobrescu; Sara Marie
Original assignee: Essilor International Compagnie Generale dOptique SA
Current assignee: EssilorLuxottica SA
Priority date: 2007-12-11
Filing date: 2008-12-09
Publication date: 2010-08-25
Also published as: KR20100091254A; CA2708516C; AU2008339801A1; FR2924825A1; FR2924825B1; CA2708516A1; AU2008339801B2; JP5450440B2; US20100321633A1; WO2009080979A3; JP2011507021A; WO2009080979A2; WO2009080979A9; US8186829B2

Abstract

The invention provides a progressive ophthalmic lens suitable to be worn by a person engaged in a sporting activity. For this purpose the lens has a far vision region which is enlarged, and a peripheral field of vision which is separated and whose mean sphere gradients are gentle. When a progressive lens of this kind is allocated to a wearer, the lens can have an addition value that is approximately equal to a prescribed value, or an addition value that is less than the prescribed value.

Description

PROGRESSIVE OPHTHALMIC LENS

The present invention relates to a progressive ophthalmic lens which is adapted for the practice of a sporting activity. It also relates to a method of producing such a lens which is intended for an identified wearer.

The use of eyesight while practicing a sport may have characteristics that differ from those that prevail in everyday life. In particular, far-sighted and ground-based vision are widely used in many sports, while near-vision does not or very little. Examples include golf, jogging, tennis, cycling, etc. Optionally, the near vision can be used for a limited time, such as for example to consult a mobile phone, to read a map or to score his golf score. But the athlete then fixes the mobile phone or card for a short time, just enough to read the information sought.

A large number of sports require as well as the athlete oversees a wide field of view. For example, a golfer must be able to follow the movement of his ball, and a cyclist must not be bothered by optical distortions that would appear in a peripheral zone of his visual field. For this, it is advantageous that the athlete has a dynamic peripheral vision of good quality.

In known manner, a progressive spectacle lens corrects the view of a wearer of it differently for distance vision and near vision. Such a lens thus provides an ophthalmic correction which is permanently adapted, that the wearer fixes a distant or close object. For this, the glass has an optical power that varies continuously between two areas of the glass which are respectively dedicated to far vision and near vision. But, this variation in optical power inherently produces an involuntary astigmatism that laterally limits the viewing areas from far and near the glass. Because of this, it is known to adapt the design of a progressive lens according to a main activity of the wearer, to reduce a possible embarrassment that could cause this involuntary astigmatism. For example, some designs of progressive lenses are offered, which are more suitable for working on a computer screen, and others that are more suitable for driving. But the practice of a sport, such as one of those mentioned above, may require a different adaptation of the design of a progressive lens.

Thus progressive lenses are already commercially available, the design of which is more particularly adapted for sporting practice. These glasses have in particular a far vision zone which is enlarged. But this adaptation is still insufficient compared to the need for a wide field in far vision and a good vision of the soil that is felt during the practice of certain sports.

Document US Pat. No. 7,033,022 describes a particular design of progressive ophthalmic lens, which has a very wide far vision zone. This extended area is also dedicated to the intermediate vision, which allows the wearer to clearly observe objects that are located at distances greater than or equal to one meter without moving the head. But such a glass has a near vision zone in which the optical power increases continuously in the lower part of the glass, to the lower edge thereof. At the same time, the glass which is described in this document has a zone devoid of involuntary astigmatism, the width of which decreases continuously between the far vision zone and the lower edge of the glass. For this reason, the design of such a progressive ophthalmic lens is said funnel ("funnel" in English). The near vision conditions that are provided by such a glass are then uncomfortable, especially because the wearer may have difficulty finding the point of the glass that gives him a clear view of a close object. Certain situations may even force the wearer to adopt a painful and tiring posture to achieve a close vision that is satisfactory.

EP 1 744 202, in the name of the Applicant, proposes a progressive ophthalmic lens which comprises a complex surface, a prismatic reference point and a mounting cross, and which is adapted to be disposed in front of an eye of a wearer so that a scan of a direction of the wearer's gaze through the lens defines a meridian line corresponding to a trace of intersection of the gaze direction with the surface The meridian line connects a top edge and a lower edge of the lens through a distance vision reference point, the mounting cross, the prismatic reference point and a near vision reference point The mounting cross and the reference point of 4mm above the prismatic reference point and 14mm below it The complex surface has a power addition between near and far vision reference points, as well as values that are limited for the following quantities: the normalized cylinder with respect to addition, the mean normal sphere rebound with respect to addition, and the length of progress In the context of the present patent application, a value which is normalized with respect to addition means that the result of the quotient of this value is considered by addition.

It is recalled that the average sphere and the cylinder of a complex surface, estimated at a point thereof, are respectively given by the following formulas:

_{C 1} n - lfl I)

S _p h = - + (1a)

2 [RI IUJ

Cyl = (n - 1) - - ^] I (1 b)

⁷ Rl R2 wherein n is the index of light refraction of the lens material at the point considered, and R1 and R2 respectively denote the maximum and minimum radii of curvature of the complex surface at the same point, measured in two perpendicular directions Moreover , the progression length is defined as the distance that is measured vertically on the complex surface of the lens between the mounting cross and a meridian line point for which the mean sphere has a difference of 85% of the addition by relation to the distance vision reference point

Nevertheless, the visual comfort afforded by a lens as described in EP 1 744 202 may be insufficient, when the wearer of this lens practice a sporting activity.

An object of the present invention is therefore to provide a wearer of a progressive ophthalmic lens comfort which is improved, in particular while practicing a sporting activity.

For this, the invention proposes a progressive ophthalmic lens whose complex surface has the following characteristics:

a cylinder value normalized to the addition that is less than 1.0 over the entire complex surface of the lens;

- An average sphere normalized to the addition, which has no rebound on a 20 mm radius circle centered at the prismatic reference point;

a progression length which is less than or equal to 15 mm; and

the mean sphere has a normalized variation with respect to the addition, in any segment of the meridian line between the prismatic reference point and the far vision reference point, which is less than or equal to 0.08.

A first advantage of a lens according to the invention results from the variation of the average sphere of the complex surface along the meridian line. Due to this variation which is small between the prismatic reference point and the distance vision reference point, the far vision zone extends further down in the lens. Thus, the wearer benefits from a correction that is adapted for his far vision even for distant objects that are located at an intermediate distance. Thus, starting the progression at a low level in the lens allows a vision of the ground that is easy. In this way, the wearer of the lens can satisfactorily see a golf ball on the ground, or correctly see the path just in front of him when jogging.

A second advantage of a lens according to the invention results from the cylinder of the complex surface which has limited values over the entire surface of the lens. Thanks to these low cylinder values, the lens has an involuntary astigmatism which is weak, even in lateral parts of the lens. Ia lens that are close to its peripheral edge. The wearer thus enjoys a satisfactory vision through the entire lens. In other words, the wearer of the lens has a far vision through the lens which is unobstructed, not only horizontally on the right and left sides, but also vertically in the downward direction. In addition, the absence of average sphere bounce on the 20 mm radius circle centered at the prismatic reference point ensures that variations in optical power do not interfere with peripheral vision in the side portions of the lens. These qualities of far-sighted vision and good peripheral vision also provide the wearer with a dynamic vision that is good. In particular, any pitching sensation that may be felt when it changes its viewing direction through the lens is greatly diminished or completely absent.

A third advantage results from the length of progression that is limited. With this rather short progression length, the lens has an optical power that is adapted for near vision of the wearer at points of the meridian line that are not located too low below the mounting cross. In other words, the area of the lens that is adapted to correct the near vision of the wearer is not located too low in the lens. Thus, the near vision area is easily and quickly accessible to the wearer, while allowing him to see the ground through the intermediate vision zone without forcing him to take an uncomfortable posture.

According to an improvement of the invention, the mean sphere may exhibit absolute variations which are less than 0.25 diopters in a meridional line segment of at least 5 millimeters in length, which extends from the reference point near vision towards the lower edge of the lens. In other words, the lens provides the wearer with a near vision zone that is vertically extended, and in which the optical power is substantially constant. Good comfort in near vision results, in particular because the wearer has a sufficient interval within which he can vary the direction of his gaze while maintaining sight conditions that are adapted to his near vision. This comfort allows him to sweep vertically without embarrassing the screen of his phone portable.

The invention also proposes a method for producing an ophthalmic lens as described above, which is intended for an identified wearer. This process comprises the following steps:

/ 1 / obtaining an optical power value for far vision and an addition value, which are prescribed for the wearer;

To obtain a reduced addition which is equal to the addition prescribed for the wearer, minus a quantity between 0.75 diopters and 1.25 diopters;

/ 3 / determining a lens design from the prescribed optical power value for far vision and reduced addition value; and

/ 4 / make the lens according to the determined design.

Such a method therefore comprises a step of reducing the addition, with respect to the addition value that is initially prescribed for the wearer. The wearer can then enjoy a far vision that is even more unobstructed, while having a near vision area that allows him to look at objects close together, at least during periods of short or medium duration. The near vision conditions, through the lens, are good enough to allow him to read the time at his watch or to view the screen of his mobile phone.

Other features and advantages of the present invention will become apparent in the following description of nonlimiting exemplary embodiments, with reference to the appended drawings, in which:

FIGS. 1a and 1b are mean sphere and cylinder maps, respectively, for a progressive ophthalmic lens according to the invention which has a 1.0 diopter addition;

FIGS. 2a-5a and 2b-5b correspond to FIGS. 1a and 1b, respectively, for other progressive ophthalmic lenses according to the invention which have additions equal to 1.5 diopters, 2.0 diopters, 2.5 diopters. and 3.0 diopters; and FIG. 6 illustrates the quantity of bounce considered for lenses according to the invention

In known manner, a spectacle lens has an anterior face and a posterior face. Between these two faces, it consists of a refractive transparent medium that is usually homogeneous. It may be a finished lens whose two faces have definitive shapes. This is a glass that is already cut to the dimensions of a glass housing of a pair of glasses. But the finished glass can also be considered before being cut. Alternatively, it can be a semi-glass. finished, of which only one face has a definitive shape, and the other face is intended to be machined later according to the prescription of a carrier Most often, the anterior face of the semi-finished glass is final, and the posterior face is the one that is intended to be machined in recovery In the present patent application, ophthalmic lens is understood as well a finished glass as a semi-finished glass When it is not cut out, the len The lens has a peripheral edge which is most often circular, for example 60 mm (mm) in diameter. The anterior and posterior faces of the lens are thus designated with respect to their position when the lens is used by the wearer, after that the lens was assembled in the pair of glasses and placed on the wearer's face

In the context of the present description, it is assumed that the anterior face of the progressive lenses that are considered has a complex surface shape. In other words, it has a mean sphere that varies continuously along this face.

The following points are defined on the anterior face of the lens, in a manner that is known to those skilled in the art

the prismatic reference point, which is denoted by O, and which is associated with a prism value of the lens,

a mounting cross, which is marked CM, and which serves to vertically adjust a position of the lens relative to the center of the pupil of the wearer,

- a distance vision reference point, which is denoted VL, and to which is associated an optical power value adapted to correct the vision of the wearer when looking at a distant object, typically located more than two meters from him, and

a near-vision reference point, which is denoted VP, and which is associated with an optical power value adapted to correct the wearer's vision when looking at a close object, located about forty centimeters from his eyes

These reference points and reference points are indicated by the manufacturer of the glass They can be either communicated by the latter in a note that it provides with the glass, is engraved permanently or indicated by a temporary tracing on the glass

In the following, the terms "on", "under", "above", "below" and "lateral" are used to qualify portions or points of the lens relative to a reference position of the lens used by the wearer This position corresponds to a vertical holding of the wearer's head equipped with a frame in which the lens is assembled

The anterior face of the lens is then marked by two Cartesian axes expressed in millimeters X for the horizontal axis and Y for the vertical axis, the latter being oriented positively upwards. Usually, the point O is the center of this marker, the point CM has for coordinates X = O and Y = 4 mm, the far vision point VL has coordinates X = O and Y = 8 mm, and the near vision point VP has the vertical coordinate Y = - 14 mm VL is thus located on a vertical line above O, and VP is below O being shifted laterally (parallel to the X axis) with respect to VL The direction of VP shift is reversed between a straight lens and a left lens A line LM, which is called the main meridian line, connects the points VL, CM, O and VP It corresponds to the trace on the lens of the direction of gaze when the wearer observes successively objects which are situated in front of him at varying heights and distances

The addition of the lens is then defined as the difference between the average sphere values of the anterior face at points VP and VL

Figures 1a, 2a, 3a, 4a and 5a are sphere maps average of the front faces of five distinct lenses according to the invention. Each of these maps is limited by the peripheral edge of the corresponding lens, and indicates the value of the average sphere for each point of the front face of this lens. The lines that are shown on these maps are iso-sphere lines, which connect points of the front face of each lens that correspond to the same average sphere value. This value is indicated in diopters for some of these lines.

Similarly, Figures 1b, 2b, 3b, 4b and 5b are cylinder mappings. The lines that are reported on these are iso-cylinder lines, which connect points of the front face of each lens that correspond to the same cylinder value.

The formulas 1a and 1b recalled above are the mathematical expressions of the mean sphere and the cylinder.

The cylinder maps 1b-5b show that for each lens, the value of the cylinder at any point on its anterior face, divided by the addition value of this lens, is less than 1.0. Thus, from FIG. 1b, the cylinder values of the 1.0 diopter addition lens are all less than 1 diopter; according to FIG. 2b, the cylinder values of the addition lens 1, 5 diopters are all less than 1.5 diopters; etc. for Figures 3b, 4b and 5b.

Furthermore, a circle C is drawn on the average sphere maps of FIGS. 1a-5a, which has the center O point and radius 20 mm. The average sphere values that appear on the circle C decrease regularly from the intersection of this circle with the meridian line LM in the lower part of the lenses (Y <0), towards the intersection of the same circle C with the meridian line LM in the upper part of the lenses (Y> 0). In other words, the average sphere has no rebound on the circle C on either side of the meridian line, which ensures that the optical characteristics of the lens have smooth and uniform variations. Good peripheral dynamic vision results. The inventors recall that a rebound of the average sphere normalized with respect to the addition of the The lens, when present on circle C, appears on one side, right or left, or on both sides of the lens. Its height is then calculated as the difference, divided by the addition, between mean sphere values which are respectively reached at two local mean sphere extremes which lie between the absolute maximum and the absolute minimum of the mean sphere. on circle C,

Figure 6 illustrates the principle of determining such a rebound, as this is excluded by the present invention. It represents variations of the average sphere of the complex surface along the circle C. The abscissa axis of the graph of Figure 6 locates displacements on the circle C by values of a polar angle α which is defined from vertical half-axis from the point O and directed towards the upper edge of the lens. The mean sphere has an absolute minimum for the null value of α, which corresponds to the far vision zone. It presents an absolute maximum for a value of α which is close to and offset from 180 degrees, and which corresponds to the near vision zone. A local minimum and a local maximum of the mean sphere, which are respectively noted Min. loc. and Max. loα, are present between these values of α. Δ is the difference between the values of the average sphere which are reached respectively at this local maximum and at this local minimum. The average sphere spherical normalized with respect to the addition is then the quotient of Δ by the addition of the complex surface.

The following table groups together the average sphere values of the front faces of the appended figures, which correspond to the points O and VL:

The numerical values that are given in this table correspond to lenses which consist of the same transparent homogeneous material, with a refractive index n which is equal to 1, 591,

The last column of this table indicates the average sphere variation, normalized to the addition, which is calculated between the points O and VL: ΔSph / Additon = 1 Sph (O) - Sph (VL) I / Addition, where II denotes the absolute value. This amount is less than 0.08 in all cases. It also remains less than 0.08 regardless of the pair of points that is considered along the LM line between the points O and VL to evaluate the average sphere. Advantageously, the amount ΔSph / Addition is less than or equal to 0.05, preferably less than or equal to 0.04, between the points O and VL along the line LM, as well as in any segment of this line which is located between these points.

Finally, the average sphere maps of FIGS. 1a-5a show that the corresponding lenses have respective lengths of progression that are less than or equal to 15 mm.

It may be advantageous that the average sphere normalized to the addition has limited spatial variations in certain parts of the glass, in order to improve the dynamic vision of the wearer of the lens while maintaining good accessibility to the near vision. Thus, the average sphere normalized to the addition may have a maximum slope which is between 0.09 mm ^-1 and 0.11 mm ^-1 along the meridian line, and / or a sphere gradient which is less than or equal to 0.9 mm ^"1 along circle C.

The general shape of the far and near vision zones of the invention can be visualized from the cylinder maps (FIGS. 1b-5b). In the case of the lenses of the appended figures, two iso-cylinder lines which are associated with the same cylinder value on each side of the meridian line LM form a constriction between the points O and VP. In other words, they have an hourglass profile with a progressive spacing that increases around the point VP towards the lower edge of the lens. This profile ensures that the near vision area has a width sufficient to provide good comfort to the wearer when looking at a close object through the lower part of the lens. In addition, the far vision zone of each lens of the appended figures may have a width W _L which is greater than 52 mm at the mounting cross CM (see the maps of FIGS. 1b-5b). This width W _L is equal to the distance which is measured on a horizontal line passing through the mounting cross CM, between the two iso-cylinder lines which are located on each side of the meridian line LM and which correspond to a cylinder value equal to half of the addition Preferably, the width W _L of the far vision zone may be greater than 56 mm at the mounting cross CM

In fact, to obtain a far vision zone that is enlarged as well as gentle gradients that confer good peripheral vision, it may be advantageous to adjust the complex surface design by reducing a Wp width of the viewing area of Thus, the width Wp of the near vision zone is advantageously less than 14 mm at a point B of the meridian line which is located 5 mm below the near vision reference point VP (see the maps of figures 1b-5b) The width w _P is equal to the distance measured on a horizontal line passing through the point B, between two iso-cylinder lines which are situated on each side of the meridian line LM and which correspond to a Moreover, Wp is less than 12 mm, preferably between 10 mm and 11.5 mm. The zone of vision from a distance can then be particularly large, while extending more I oin each side of the LM meridian line towards the bottom of the lens

Several ways of assigning a lens as described above to a wearer who is initially identified are described. First of all, an optical prescription is obtained for the wearer, which specifies in particular an average optical power value in far vision, with possibly astigmatism characteristics and an addition value These values and characteristics are established with respect to one or more visual defects which are observed for the wearer The lens can then be made from a semi-finished glass which is selected among a series of available models corresponding to different addition values

According to a conventional method of selecting semi-finished glass, this one is chosen to have a complex surface whose addition is substantially equal to the addition which is prescribed for the wearer The posterior face of the semi-finished glass is then machined to obtain, at the far vision point, substantially the value of the optical power prescribed for distance vision, and the possible prescribed astigmatism correction In this case, the lens that is supplied to the wearer has an optical power at the point of near vision that compensates for its visual defect for the near vision

According to an alternative method proposed by the present invention, the lens that is supplied to the wearer can be determined from the prescribed values, reducing the addition value. For this, a reduced addition is calculated for the wearer, which is equal to Prescribed addition decreased by 0.75 diopter between 1.25 diopters. For example, the reduced addition may be equal to the addition which is prescribed for the wearer, minus 1.0 diopter. It may also be determined in a more complex way, in particular by applying addition corrections which differ according to the addition value which is prescribed for the carrier. By way of example, the reduced addition can be calculated by applying the following formula when the prescribed addition is greater than or equal to 1, 5 diopters Add red = x x Add presc - β, where Add_red is the reduced addition, Add_presc is the prescribed addition, α is a first consta between 0.90 and 1.05, and β is a second constant between 0.75 diopter and 0.85 diopter. In addition, when the prescribed addition is less than 1.5 diopters, the reduced addition may have a constant value which is between 0.5 diopter inclusive and 0.75 diopter inclusive. When a reduced value of addition is used, the wearer will have a far larger viewing area in the upper part of the lens, relative to a lens having the prescribed value of addition, while having a visual correction in the lower part of the lens which will nevertheless allow him to observe objects close together

Whatever the method of selecting the addition of the lens substantially equal to the addition prescribed or reduced with respect thereto, a lens design is then determined from the optical power value that has been prescribed for the far vision and addition value prescribed or reduced. This design of the lens can be determined, in particular, taking into account the behavioral characteristics of the wearer and / or wear characteristics of the lens by the wearer. The behavioral characteristics of the wearer may be, in particular, a propensity of the wearer to turn more eyes than the head when looking successively in different directions. The wearing characteristics of the lens may depend, in particular, on the frame of the pair of spectacles which is chosen by the wearer. They may include, in particular, a distance between the pupil of the eye and the posterior surface of the lens, a pantoscopic angle, etc.

The lens is then produced, in a known manner, for example by machining the rear face of a semi-finished glass that corresponds to the design that has been selected for the wearer, and the prescribed or reduced addition.

It should be understood that while the accompanying figures illustrate the invention for five addition values, the present invention may be implemented with any addition values. Finally, the invention can be used for a myopic carrier as well as for a hyperopic or astigmatic carrier, by adapting the optical power value or that of astigmatism to the distance vision reference point.

Claims

R E V E N D l C A T IO N S

A progressive ophthalmic lens comprising a complex surface, a prismatic reference point (O) and a mounting cross (CM), and adapted to be disposed in front of a wearer's eye so that a scan of a look direction of the carrier through the lens defines a meridian line (LM) corresponding to a trace of intersection of said viewing direction with said surface, said meridian line connecting an upper edge and a lower edge of the lens through a reference point distance vision (VL), the mounting cross, the prismatic reference point and a near vision reference point (VP), the mounting cross (CM) being 4 mm above the prismatic reference point (O) and the near-vision reference point (VP) being located 14 mm below said prismatic reference point (O), the complex surface having a power addition between the law-view reference points n (VL) and up close (VP), and having

/ i / a cylinder value normalized to the addition less than 1.0 over the entire complex surface of the lens,

/ n / an average sphere normalized to the addition, showing no bounce on a 20 mm radius circle centered at the prismatic reference point (O), and

/ m / a progression length less than or equal to 15 mm, said progression length being the distance measured vertically between the mounting cross (CM) and a point on the meridian line for which the mean sphere has a difference of 85% of addition to the reference point of far vision, the lens being characterized in that

/ ιv / the average sphere of the complex surface has a normalized variation with respect to the addition, in any segment of the meridian line (LM) between the prismatic reference point (O) and the distance vision reference point (VL), less than or equal to 0.08.

A lens according to claim 1, wherein the average sphere of the complex surface has a normalized variation with respect to the addition, in any segment of the meridian line (LM), between the prismatic reference point (O) and the distance vision reference point (VL), less than or equal to 0.05, preferably less than or equal to 0.04.

A lens according to claim 1 or 2, wherein the average sphere normalized to the addition, for said complex surface, has a maximum slope of between 0.09 mm ^-1 and 0.11 mm ^-1 along the meridian line (LM).

A lens according to any one of the preceding claims, wherein the average sphere normalized to the addition, for said complex surface, has a gradient of less than or equal to 0.9 mm- ¹ along the radius circle. mm centered at the prismatic reference point (O).

A lens according to any one of the preceding claims, wherein the average sphere of the complex surface has absolute variations of less than 0.25 diopters in a segment of the meridian line (LM) of at least 5 millimeters in length and extending from the near vision reference point (VP) towards the lower edge of the lens.

A lens according to any one of the preceding claims, wherein the complex surface has a near vision zone width of less than 14 mm at a point B of the meridian line 5 mm below the vision reference point. close to (VP), the width of the zone of near vision at said point B being equal to the distance measured on a horizontal line passing through the point B, between two iso-cylinder lines located on each side of the meridian line (LM) and corresponding to a cylinder value equal to half the addition.

The lens according to claim 6, wherein the width of the near-area of the complex surface at point B is less than 12 mm, preferably 10 mm to 11.5 mm.

A lens according to any one of the preceding claims, wherein the complex surface has a far vision zone width greater than 52 mm at the mounting cross (CM), the width of the far vision zone at said cross of mounting being equal to the distance measured on a horizontal line passing through said mounting cross, between two iso-cylinder lines located on each side of the meridian line (LM) and corresponding to a cylinder value equal to half of the bill

A lens according to claim 8, wherein the width of the far vision area of the complex surface is greater than 56 mm at the mounting cross (CM)

A method of producing an ophthalmic lens according to any of the preceding claims for an identified wearer, said method comprising the following steps

/ 1 / obtaining an optical power value for distance vision and an addition value, prescribed for said wearer,

121 obtain a reduced addition equal to the addition prescribed for the wearer, reduced by an amount between 0.75 diopters and 1.25 diopters,

/ 3 / determining a lens design from the prescribed optical power value for far vision and reduced addition value, and

141 realize the lens according to the determined design

The method of claim 10, wherein the design of the lens is determined in step / 3 / taking into account features selected from a propensity of the wearer to turn the eyes more than the head when viewed successively in different directions, a distance between the pupil of the eye and the posterior surface of the lens, and a pantoscopic angle

12. The method of claim 10 or 11, wherein the reduced addition is equal to the addition prescribed for the wearer, minus 1.0 diopter.

13. The method of claim 10 or 11, wherein the reduced addition is obtained from the addition prescribed for the wearer, as follows:

- when the prescribed addition is greater than or equal to 1.5 diopters: by applying the formula Add red = α x Add presc - β, where AddjOd designates the reduced addition, Add_presc designates the prescribed addition, α is a first constant between 0.90 and 1, 05, and β is a second constant between 0.75 diopter and 0.85 diopter; and

when the prescribed addition is less than 1.5 diopters: by taking a constant value for said reduced addition, said value being between 0.5 diopters inclusive and 0.75 diopters inclusive.